Gate valves are commonly used valves that completely shut off fluid flow by moving a gate-like barrier into the pipeline path, creating a powerful seal. In the fully open position, gate valves completely remove the gate from the fluid path, which runs straight through the valve causing very little to no loss in flow rate or flow volume.
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Due to their construction design, sanitary gate valves are quite slow to actuate — it takes several full rotations of the knob or wheel handle actuator to change the gate’s position. This quality makes them suitable only for applications with infrequent on/off switching. If you need a fast-actuating valve with other similar qualities, consider using a ball valve instead.
The opening and closing member of a flanged gate valve is the gate plate. The gate plate moves perpendicular to the pipeline’s fluid flow direction. Gate valves can only be used in the fully open or fully closed positions; they are not suitable for regulation and throttling.
The gate valve’s closing mechanism is the sealing surface of the gate plate and valve seat, which are highly smooth, flat, and consistent. They adhere directly to each other, creating a dependable seal that prevents the medium from flowing through the valve. They rely on the shape of the top mold, the spring, or the gate plate to enhance the sealing effect.
Gate valves are mainly used to cut off flow through the pipeline. They offer very little fluid resistance because the valve’s opening is typically the same diameter as the pipeline. In this sense, it can be described as a straight-through flow valve. It can be used in circumstances where the medium flows in both directions. It is not directional, so the sealing surface is not prone to erosion when the valve is fully open. A wide variety of gate valves are made in different DN sizes; they are commonly manufactured in DN50 up to DN.
Gate valves are used in several applications like process manufacturing, automotive, oil & gas, pharmaceutical, and marine industries. Gate valves are also one of the most widely used valves in water supply systems.
The strength test of the gate valve is the same as that of the sanitary shut-off valve. There are two types of sealing performance tests for gate valves.
The sealing performance test of the pneumatic gate valve stuffing and gasket should be carried out before the valve’s sealing performance test.
1- Purpose of using Gate Valve on stream
Gate Valve is used to open and close the flow only. Not commonly used in flow control with the following components.
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2- Operation (open-closed) of Gate Valve
3- The Hydrostatic Test for Gate Valve requires 3 parts, Shell, Seat, and Backseat
The hydro-testing according to API 598. The valve standard is ASME B16.34
***Gate Valve – Hydrotest Backseat;
The Hydrostatic Backseat Test must be tested at a pressure of not less than 1.1 times the Maximum Operating Pressure by fully opening the valve and releasing the gland of the gate valve to check for leaks through the Backseat.
***Gate Valve – Hydrotest Shell;
Hydrostatic Shell Test must be tested at a pressure not less than 1.5 times the Maximum Operating Pressure by opening the valve partially open and tightening the gland to get the pressure. Then check for leaks through Shell.
***Gate Valve – Hydrotest Seat;
Hydrostatic Closure Test or Seat Test, continue to test from Shell Test at the pressure not less than 1.1 times of Maximum Operating Pressure by closing the valve fully closed and then checking the leak through Seat and Disk. Both tests must be done on two (2) – Side of Gate Valve.
***Valve – Pressure Test Duration;
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