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Hand Valves(Plumbing Thread Nominal:1/2)

Hand valves are devices used to manually adjust the flow direction, pressure, flow rate or another property of a fluid (liquid, vapor or gas). Hand valve bodies are made of materials such as aluminum, steel, stainless steel, PVC and resin. Hand valves are usually connected for use with pipes containing flowing fluids using fittings made of the same material as the hand valve body. Hand valve controls are often made of a different material from the body. The controls come in forms such as knobs, handles and levers. The standard types are 2-way valves with 2 fluid input/output ports and 3-way valves with 3. They are attached in accordance with the direction of fluid flow. There are many different hand valve models designed to connect to different pipe diameters and support different operating pressure ranges. There are also different fitting types such as screw-in, flange and welded fittings, so each hand valve model should be selected to match the operating environment.
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  • You can add up to 6 items per a category to the compare list. Sale

    Finger Valve VHK Series
    Finger Valve VHK Series
    Finger Valve VHK Series
    Finger Valve VHK Series
    Finger Valve VHK Series
    Finger Valve VHK Series
    Finger Valve VHK Series
    Sale

    Finger Valve VHK Series

    SMC

    Finger Valve VHK Series that makes it easy to distinguish between 2-port valves and 3-port valves by the color of the knobs. [Features]· Poppet valve construction that rarely suffers from seal defects.· The direction of the knob clearly indicates whether the valve is open or closed.

    CAD :
    2D / 3D
    Connecting Tube Diameter Number of Ports Switching Operation Effective Sectional Area(mm2) Main Body Shape Pipe Port Type Number of Switching Positions Plumbing Thread Nominal Plumbing Type and Direction Effective Sectional Area【classification】(mm2) How to Mount
    - 2-Port / 3-Port Knob 11.25 ~ 15.68 One-Touch Fitting Type Rc (R) 2-Position Normally Closed 1/2 Direct Side Surface ~15 ~ ~20 Side / Bottom
    Days to Ship: Số ngày giao hàng: Same day or more
    day to ship Same day or more
  • You can add up to 6 items per a category to the compare list.

    Hand Valve VH Series
    Hand Valve VH Series
    Hand Valve VH Series
    Hand Valve VH Series
    Hand Valve VH Series
    Hand Valve VH Series

    Hand Valve VH Series

    SMC

    Hand Valve VH Series that allows the direction of flow to be confirmed with a glance. [Features]· The flow direction can be confirmed with just a glance at the direction of the handle.

    CAD :
    2D / 3D
    Connecting Tube Diameter Number of Ports Switching Operation Effective Sectional Area(mm2) Main Body Shape Pipe Port Type Number of Switching Positions Plumbing Thread Nominal Plumbing Type and Direction Effective Sectional Area【classification】(mm2) How to Mount
    - 4-Port Manual Lever 64.58 ~ 79.34 Block Horizontal Type Rc (R) / NPT / G 3-Position Closed Center / 3-Position Exhaust Center / Others 1/2 Direct Side Surface / Direct Bottom Surface ~70 ~ ~80 Bottom / Panel Mounting
    Days to Ship: Số ngày giao hàng: Same day or more
    day to ship Same day or more
  • You can add up to 6 items per a category to the compare list.

    Finger Valve, VHK-A Series

    Finger Valve, VHK-A Series

    SMC

    [Features]・ The opening and closing of the valve is easily displayed by the direction of the knob・ Small knob operation force (0.04 to 0.14 N・m)・ With handle removal prevention function・ Large effective cross-section precision 2.0 to 17.5 mm2・ Poppet valve structure with few seal defects・ Series from tube outer diameter ø4・ 4 types can be selected according to the piping specifications・ The 3-port valve exhausts the residual pressure on the 2 (A) side with SHUT (There is no exhaust port)

    Connecting Tube Diameter Number of Ports Switching Operation Effective Sectional Area(mm2) Main Body Shape Pipe Port Type Number of Switching Positions Plumbing Thread Nominal Plumbing Type and Direction Effective Sectional Area【classification】(mm2) How to Mount
    - 2-Port / 3-Port Manual Lever 13.1 ~ 15.68 One-Touch Fitting Type Rc (R) 2-Position Normally Closed / 2-Position Exhaust 1/2 Direct Side Surface ~15 ~ ~20 Side
    Days to Ship: Số ngày giao hàng: Quote
    day to ship Quote
  • You can add up to 6 items per a category to the compare list.

    Residual Pressure Relief 3 Port Hand Valve VHS400/500
    Residual Pressure Relief 3 Port Hand Valve VHS400/500
    Residual Pressure Relief 3 Port Hand Valve VHS400/500
    Residual Pressure Relief 3 Port Hand Valve VHS400/500
    Residual Pressure Relief 3 Port Hand Valve VHS400/500
    Residual Pressure Relief 3 Port Hand Valve VHS400/500
    Residual Pressure Relief 3 Port Hand Valve VHS400/500
    Residual Pressure Relief 3 Port Hand Valve VHS400/500
    Residual Pressure Relief 3 Port Hand Valve VHS400/500
    Residual Pressure Relief 3 Port Hand Valve VHS400/500

    Residual Pressure Relief 3 Port Hand Valve VHS400/500

    SMC

    Residual Pressure Relief 3 Port Hand Valve VHS400/500 that allows the flow direction to be confirmed with just a glance at the direction of the handle. [Features]· A safety manual switch valve for preventing accidents that can be caused by residual pressure while performing maintenance on pneumatic systems .· The valve is compact with a large capacity.

    CAD :
    2D / 3D
    Connecting Tube Diameter Number of Ports Switching Operation Effective Sectional Area(mm2) Main Body Shape Pipe Port Type Number of Switching Positions Plumbing Thread Nominal Plumbing Type and Direction Effective Sectional Area【classification】(mm2) How to Mount
    - 3-Port Manual Lever 62.11 Others Rc (R) / NPT 2-Position Normally Closed 1/2 Direct Side Surface ~70 Bottom
    Days to Ship: Số ngày giao hàng: Same day or more
    day to ship Same day or more
  • You can add up to 6 items per a category to the compare list.

    Shut-off Valve, Hand Valve Straight A
    Shut-off Valve, Hand Valve Straight A
    Shut-off Valve, Hand Valve Straight A
    Shut-off Valve, Hand Valve Straight A
    Shut-off Valve, Hand Valve Straight A
    Shut-off Valve, Hand Valve Straight A
    Shut-off Valve, Hand Valve Straight A

    Shut-off Valve, Hand Valve Straight A

    PISCO

    [Features]·Capable of opening and closing air pressure inlet to equipment·3-direction valve type and 2-direction valve type are available·The 3-direction valve type exhausts the residual pressure on the output side when closed·Selectable from 4 types according to applications

    CAD :
    2D / 3D
    Connecting Tube Diameter Number of Ports Switching Operation Effective Sectional Area(mm2) Main Body Shape Pipe Port Type Number of Switching Positions Plumbing Thread Nominal Plumbing Type and Direction Effective Sectional Area【classification】(mm2) How to Mount
    Ø10 / Ø12 2-Port / 3-Port Knob 15.7 ~ 16.1 One-Touch Fitting Type One-Touch Plumbing 2-Position Normally Closed 1/2 - ~20 Side
    From: 331,808 VND
    Days to Ship: Số ngày giao hàng: Same day or more
    day to ship Same day or more
  • You can add up to 6 items per a category to the compare list.

    Shut-off Valve, Ball Valve, Straight

    Shut-off Valve, Ball Valve, Straight

    PISCO

    Effective sectional area is secured according to the size of the tube used.

    CAD :
    2D
    Connecting Tube Diameter Number of Ports Switching Operation Effective Sectional Area(mm2) Main Body Shape Pipe Port Type Number of Switching Positions Plumbing Thread Nominal Plumbing Type and Direction Effective Sectional Area【classification】(mm2) How to Mount
    Ø10 / Ø12 2-Port Knob 41 ~ 55 One-Touch Fitting Type Others 2-Position Normally Open 1/2 - ~50 ~ ~60 -
    From: 420,993 VND
    Days to Ship: Số ngày giao hàng: Same day or more
    day to ship Same day or more
  • You can add up to 6 items per a category to the compare list.

    Hand Valve (2 Positions, 3 Ports) HSV Series
    Hand Valve (2 Positions, 3 Ports) HSV Series
    Hand Valve (2 Positions, 3 Ports) HSV Series
    Hand Valve (2 Positions, 3 Ports) HSV Series
    Hand Valve (2 Positions, 3 Ports) HSV Series

    Hand Valve (2 Positions, 3 Ports) HSV Series

    AIRTAC

    [Features]·Various thread connection types・ Improved operability·Large effective distribution area·With color anodizing, it is possible to maintain color gloss for a long time

    CAD :
    2D / 3D
    Connecting Tube Diameter Number of Ports Switching Operation Effective Sectional Area(mm2) Main Body Shape Pipe Port Type Number of Switching Positions Plumbing Thread Nominal Plumbing Type and Direction Effective Sectional Area【classification】(mm2) How to Mount
    - 3-Port Others 140 Pin Shape Rc (R) 2-Position Normally Closed 1/2 Direct Side Surface ~200 Side
    From: 438,176 VND
    Days to Ship: Số ngày giao hàng: 6 Day(s) or more
    day to ship 6 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    Shut-off Valve, Hand Valve, Straight B
    Shut-off Valve, Hand Valve, Straight B
    Shut-off Valve, Hand Valve, Straight B
    Shut-off Valve, Hand Valve, Straight B
    Shut-off Valve, Hand Valve, Straight B
    Shut-off Valve, Hand Valve, Straight B
    Shut-off Valve, Hand Valve, Straight B

    Shut-off Valve, Hand Valve, Straight B

    PISCO

    [Features]·Capable of opening and closing air pressure inlet to equipment·3-direction valve type and 2-direction valve type are available·The 3-direction valve type exhausts the residual pressure on the output side when closed·Selectable from 4 types according to applications

    CAD :
    2D / 3D
    Connecting Tube Diameter Number of Ports Switching Operation Effective Sectional Area(mm2) Main Body Shape Pipe Port Type Number of Switching Positions Plumbing Thread Nominal Plumbing Type and Direction Effective Sectional Area【classification】(mm2) How to Mount
    Ø10 / Ø12 / 3/8 2-Port / 3-Port Knob 16.5 ~ 16.8 One-Touch Fitting Type Rc (R) 2-Position Normally Closed 1/2 - ~20 Side
    From: 323,393 VND
    Days to Ship: Số ngày giao hàng: 4 Day(s) or more
    day to ship 4 Day(s) or more
  • You can add up to 6 items per a category to the compare list. Sale

    Shut-off Valve, Ball Valve, Elbow
    Sale

    Shut-off Valve, Ball Valve, Elbow

    PISCO

    Effective sectional area is secured according to the size of the tube used.

    CAD :
    2D
    Connecting Tube Diameter Number of Ports Switching Operation Effective Sectional Area(mm2) Main Body Shape Pipe Port Type Number of Switching Positions Plumbing Thread Nominal Plumbing Type and Direction Effective Sectional Area【classification】(mm2) How to Mount
    Ø10 / Ø12 2-Port Knob 36 ~ 46 One-Touch Fitting Type Others 2-Position Normally Closed 1/2 - ~40 ~ ~50 -
    From: 462,516 VND
    Special Price
    Days to Ship: Số ngày giao hàng: Same day or more
    day to ship Same day or more
  • You can add up to 6 items per a category to the compare list.

    Hand Valve (2 Position 4-Port, 3 Position 4-Port) 4HV, 4HVL Series
    Hand Valve (2 Position 4-Port, 3 Position 4-Port) 4HV, 4HVL Series
    Hand Valve (2 Position 4-Port, 3 Position 4-Port) 4HV, 4HVL Series

    Hand Valve (2 Position 4-Port, 3 Position 4-Port) 4HV, 4HVL Series

    AIRTAC

    [Features]・ Accurate localization and improved operability.・ Large effective distribution area, low pressure loss.・ 2 types of mounting, panel mounting or bottom mounting, can be selected. With mounting screws for panel mounting.

    CAD :
    2D / 3D
    Connecting Tube Diameter Number of Ports Switching Operation Effective Sectional Area(mm2) Main Body Shape Pipe Port Type Number of Switching Positions Plumbing Thread Nominal Plumbing Type and Direction Effective Sectional Area【classification】(mm2) How to Mount
    - 4-Port Manual Lever 88 Block Horizontal Type Rc (R) 3-Position Closed Center / 2-Position Direction Switching 1/2 Direct Bottom Surface ~90 Bottom
    From: 735,328 VND
    Days to Ship: Số ngày giao hàng: 6 Day(s) or more
    day to ship 6 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    Hand Valves 400HV Series

    Hand Valves 400HV Series

    KOGANEI

    Optimal for switching air cylinders. Can be switched reliably with the rotary system. Note: CAD data of this series is being revised. Please wait till the corrections are done.[Features]· Optimal for switching air cylinders.· Manually switchable 4-port valve.· Can be switched reliably with the rotary system (swing lever).

    CAD :
    2D
    Connecting Tube Diameter Number of Ports Switching Operation Effective Sectional Area(mm2) Main Body Shape Pipe Port Type Number of Switching Positions Plumbing Thread Nominal Plumbing Type and Direction Effective Sectional Area【classification】(mm2) How to Mount
    - 4-Port Manual Lever 26 Block Horizontal Type Rc (R) 3-Position Closed Center 1/2 Direct Side Surface ~30 Bottom
    From: 2,266,706 VND
    Days to Ship: Số ngày giao hàng: 4 Day(s) or more
    day to ship 4 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    Ball Valve, Straight Type VS-E

    Ball Valve, Straight Type VS-E

    NITTA

    [Features]・ Compact piping is possible・ Space-saving ball valve and push-one fitting are integrated to enable compact piping・ The tube is a push-one connection・ No jigs or tools are required to connect the tubes・ You can change the position of the handle・ If the handle open/close position interferes, the handle can be reattached and used at any position・ Nickel plated・ There is little deterioration of the surface and elution of copper ions into the fluid is prevented

    CAD :
    2D
    Connecting Tube Diameter Number of Ports Switching Operation Effective Sectional Area(mm2) Main Body Shape Pipe Port Type Number of Switching Positions Plumbing Thread Nominal Plumbing Type and Direction Effective Sectional Area【classification】(mm2) How to Mount
    Ø10 / Ø12 2-Port Manual Lever - One-Touch Fitting Type Rc (R) - 1/2 - - Side
    From: 712,011 VND
    Days to Ship: Số ngày giao hàng: 8 Day(s) or more
    day to ship 8 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    The Ball Valve angle type VA-E

    The Ball Valve angle type VA-E

    NITTA

    [Features]・ Compact piping is possible・ Space-saving ball valve and push-one fitting are integrated to enable compact piping・ The tube is a push-one connection・ No jigs or tools are required to connect the tubes・ You can change the position of the handle・ If the handle open/close position interferes, the handle can be reattached and used at any position・ Nickel plated・ There is little deterioration of the surface and elution of copper ions into the fluid is prevented

    CAD :
    2D
    Connecting Tube Diameter Number of Ports Switching Operation Effective Sectional Area(mm2) Main Body Shape Pipe Port Type Number of Switching Positions Plumbing Thread Nominal Plumbing Type and Direction Effective Sectional Area【classification】(mm2) How to Mount
    Ø12 2-Port Manual Lever - One-Touch Fitting Type Rc (R) - 1/2 - - Bottom
    From: 735,516 VND
    Days to Ship: Số ngày giao hàng: 8 Day(s) or more
    day to ship 8 Day(s) or more
BrandNhãn hiệu
Product SeriesDòng sản phẩm
CADCAD
From
Days to ShipSố ngày giao hàng
Connecting Tube Diameter
Number of Ports
Switching Operation
Effective Sectional Area(mm2)
Main Body Shape
Pipe Port Type
Number of Switching Positions
Plumbing Thread Nominal
Plumbing Type and Direction
Effective Sectional Area【classification】(mm2)
How to Mount

    You can add up to 6 items per a category to the compare list.Sale

    Finger Valve VHK Series
      Finger Valve VHK Series
      Finger Valve VHK Series
      Finger Valve VHK Series
      Finger Valve VHK Series
      Finger Valve VHK Series
      Finger Valve VHK Series

        You can add up to 6 items per a category to the compare list.

        Hand Valve VH Series
          Hand Valve VH Series
          Hand Valve VH Series
          Hand Valve VH Series
          Hand Valve VH Series
          Hand Valve VH Series

            You can add up to 6 items per a category to the compare list.

            Finger Valve, VHK-A Series

                You can add up to 6 items per a category to the compare list.

                Residual Pressure Relief 3 Port Hand Valve VHS400/500
                  Residual Pressure Relief 3 Port Hand Valve VHS400/500
                  Residual Pressure Relief 3 Port Hand Valve VHS400/500
                  Residual Pressure Relief 3 Port Hand Valve VHS400/500
                  Residual Pressure Relief 3 Port Hand Valve VHS400/500
                  Residual Pressure Relief 3 Port Hand Valve VHS400/500
                  Residual Pressure Relief 3 Port Hand Valve VHS400/500
                  Residual Pressure Relief 3 Port Hand Valve VHS400/500
                  Residual Pressure Relief 3 Port Hand Valve VHS400/500
                  Residual Pressure Relief 3 Port Hand Valve VHS400/500

                    You can add up to 6 items per a category to the compare list.

                    Shut-off Valve, Hand Valve Straight A
                      Shut-off Valve, Hand Valve Straight A
                      Shut-off Valve, Hand Valve Straight A
                      Shut-off Valve, Hand Valve Straight A
                      Shut-off Valve, Hand Valve Straight A
                      Shut-off Valve, Hand Valve Straight A
                      Shut-off Valve, Hand Valve Straight A

                        You can add up to 6 items per a category to the compare list.

                        Shut-off Valve, Ball Valve, Straight

                            You can add up to 6 items per a category to the compare list.

                            Hand Valve (2 Positions, 3 Ports) HSV Series
                              Hand Valve (2 Positions, 3 Ports) HSV Series
                              Hand Valve (2 Positions, 3 Ports) HSV Series
                              Hand Valve (2 Positions, 3 Ports) HSV Series
                              Hand Valve (2 Positions, 3 Ports) HSV Series

                                You can add up to 6 items per a category to the compare list.

                                Shut-off Valve, Hand Valve, Straight B
                                  Shut-off Valve, Hand Valve, Straight B
                                  Shut-off Valve, Hand Valve, Straight B
                                  Shut-off Valve, Hand Valve, Straight B
                                  Shut-off Valve, Hand Valve, Straight B
                                  Shut-off Valve, Hand Valve, Straight B
                                  Shut-off Valve, Hand Valve, Straight B

                                    You can add up to 6 items per a category to the compare list.Sale

                                    Shut-off Valve, Ball Valve, Elbow

                                        You can add up to 6 items per a category to the compare list.

                                        Hand Valve (2 Position 4-Port, 3 Position 4-Port) 4HV, 4HVL Series
                                          Hand Valve (2 Position 4-Port, 3 Position 4-Port) 4HV, 4HVL Series
                                          Hand Valve (2 Position 4-Port, 3 Position 4-Port) 4HV, 4HVL Series

                                            You can add up to 6 items per a category to the compare list.

                                            Hand Valves 400HV Series

                                                You can add up to 6 items per a category to the compare list.

                                                Ball Valve, Straight Type VS-E

                                                    You can add up to 6 items per a category to the compare list.

                                                    The Ball Valve angle type VA-E
                                                      BrandNhãn hiệu

                                                      SMC

                                                      SMC

                                                      SMC

                                                      SMC

                                                      PISCO

                                                      PISCO

                                                      AIRTAC

                                                      PISCO

                                                      PISCO

                                                      AIRTAC

                                                      KOGANEI

                                                      NITTA

                                                      NITTA

                                                      Product SeriesDòng sản phẩm

                                                      Finger Valve VHK Series

                                                      Hand Valve VH Series

                                                      Finger Valve, VHK-A Series

                                                      Residual Pressure Relief 3 Port Hand Valve VHS400/500

                                                      Shut-off Valve, Hand Valve Straight A

                                                      Shut-off Valve, Ball Valve, Straight

                                                      Hand Valve (2 Positions, 3 Ports) HSV Series

                                                      Shut-off Valve, Hand Valve, Straight B

                                                      Shut-off Valve, Ball Valve, Elbow

                                                      Hand Valve (2 Position 4-Port, 3 Position 4-Port) 4HV, 4HVL Series

                                                      Hand Valves 400HV Series

                                                      Ball Valve, Straight Type VS-E

                                                      The Ball Valve angle type VA-E

                                                      CADCAD
                                                      • 2D / 3D
                                                      • 2D / 3D
                                                      • 2D / 3D
                                                      • 2D / 3D
                                                      • 2D
                                                      • 2D / 3D
                                                      • 2D / 3D
                                                      • 2D
                                                      • 2D / 3D
                                                      • 2D
                                                      • 2D
                                                      • 2D
                                                      From

                                                      331,808 VND

                                                      420,993 VND

                                                      438,176 VND

                                                      323,393 VND

                                                      462,516 VND

                                                      Special Price

                                                      On Sale Till 31/03/2025

                                                      735,328 VND

                                                      2,266,706 VND

                                                      712,011 VND

                                                      735,516 VND

                                                      Days to ShipSố ngày giao hàng Same day or more Same day or more Quote Same day or more Same day or more Same day or more 6 Day(s) or more 4 Day(s) or more Same day or more 6 Day(s) or more 4 Day(s) or more 8 Day(s) or more 8 Day(s) or more
                                                      Connecting Tube Diameter----Ø10 / Ø12Ø10 / Ø12-Ø10 / Ø12 / 3/8Ø10 / Ø12--Ø10 / Ø12Ø12
                                                      Number of Ports2-Port / 3-Port4-Port2-Port / 3-Port3-Port2-Port / 3-Port2-Port3-Port2-Port / 3-Port2-Port4-Port4-Port2-Port2-Port
                                                      Switching OperationKnobManual LeverManual LeverManual LeverKnobKnobOthersKnobKnobManual LeverManual LeverManual LeverManual Lever
                                                      Effective Sectional Area(mm2)11.25 ~ 15.6864.58 ~ 79.3413.1 ~ 15.6862.1115.7 ~ 16.141 ~ 5514016.5 ~ 16.836 ~ 468826--
                                                      Main Body ShapeOne-Touch Fitting TypeBlock Horizontal TypeOne-Touch Fitting TypeOthersOne-Touch Fitting TypeOne-Touch Fitting TypePin ShapeOne-Touch Fitting TypeOne-Touch Fitting TypeBlock Horizontal TypeBlock Horizontal TypeOne-Touch Fitting TypeOne-Touch Fitting Type
                                                      Pipe Port TypeRc (R)Rc (R) / NPT / GRc (R)Rc (R) / NPTOne-Touch PlumbingOthersRc (R)Rc (R)OthersRc (R)Rc (R)Rc (R)Rc (R)
                                                      Number of Switching Positions2-Position Normally Closed3-Position Closed Center / 3-Position Exhaust Center / Others2-Position Normally Closed / 2-Position Exhaust2-Position Normally Closed2-Position Normally Closed2-Position Normally Open2-Position Normally Closed2-Position Normally Closed2-Position Normally Closed3-Position Closed Center / 2-Position Direction Switching3-Position Closed Center--
                                                      Plumbing Thread Nominal1/21/21/21/21/21/21/21/21/21/21/21/21/2
                                                      Plumbing Type and DirectionDirect Side SurfaceDirect Side Surface / Direct Bottom SurfaceDirect Side SurfaceDirect Side Surface--Direct Side Surface--Direct Bottom SurfaceDirect Side Surface--
                                                      Effective Sectional Area【classification】(mm2)~15 ~ ~20~70 ~ ~80~15 ~ ~20~70~20~50 ~ ~60~200~20~40 ~ ~50~90~30--
                                                      How to MountSide / BottomBottom / Panel MountingSideBottomSide-SideSide-BottomBottomSideBottom

                                                      Loading...Tải…

                                                      1. 1

                                                      Application example related to this categoryVí dụ ứng dụng liên quan đến danh mục này

                                                      Related Categories to Hand ValvesDanh mục liên quan đến Hand Valves

                                                      FAQ Hand Valves

                                                      Question: What is a hand valve and its functions?
                                                      Answer: A hand valve is a manually operated device used to control the flow of fluid (liquids or gases) in a system. It consists of a handle or lever that, when turned, adjusts the position of an internal mechanism to either open or close the valve. Hand valves serve to regulate fluid flow, isolate sections of a pipeline for maintenance, and control pressure. They find application in various industries such as plumbing and industrial processes.
                                                      Question: When should you use the hand valve?
                                                      Answer: Use a hand valve when manual control of fluid flow is necessary. It's employed to start, stop, or adjust flow rates in systems requiring human intervention, such as emergencies, maintenance, or precise adjustments. Hand valves are useful when automation isn't feasible, during equipment servicing, or when immediate response to changes is needed. They offer a simple and reliable means of flow regulation in various industries.
                                                      Question: What are the advantages and disadvatages of hand valves / manual valves?
                                                      Answer: Advantages of hand valves (manual valves) include simplicity, reliability, and cost-effectiveness. They offer precise control and immediate response during emergencies or maintenance, making them suitable for small-scale applications. However, they can be slower to operate compared to automated valves, require physical presence for adjustments, and might not be suitable for large-scale or continuous processes. Additionally, potential human error in operation and limited remote control are notable disadvantages.
                                                      Question: What are the common materials used for valves?
                                                      Answer: Hand valves are commonly constructed from materials such as brass, stainless steel, cast iron, bronze, and plastic (such as PVC or CPVC). The choice of material depends on factors like the type of fluid being handled, pressure requirements, temperature conditions, and corrosion resistance. These materials ensure durability and compatibility with various applications across industries like plumbing, industrial processes, and water treatment.