How Do Gate Valves Work?
A gate valve malaysia is a control valve that either lets fluid flow through unhindered or shuts it down. The primary benefit of a gate valve is the clear, straight-through channel, which results in low-pressure loss over the valve. Unlike butterfly valves, a gate valve’s open bore allows for the passage of a pig during pipe cleaning procedures. Gate valves shouldn’t be used to control the flow because they are slower than quarter-turn valves and should only be utilised in fully open or closed positions. A manual gate valve is more economical because it is used less frequently than automated gate valves, which can have either an electric or pneumatic actuator. Sluice gate valves are another frequent name for gate valves.
The Gate Valve Symbol
The gate valve symbol has two triangles pointing towards the centre of a vertical line.
The Parts of the Gate Valve
A gate valve has seven main parts, the handwheel, stem, gasket, bonnet, valve body, flange, and gate. The most typical connection type to attach the valve to an application is a flanged gate valve or a threaded gate valve. The handwheel, stem, bonnet, and gate may also have various designs to fit various purposes, depending on the precise design and application. The components of the gate valve continue to serve the same primary purpose, nevertheless. To discover those areas, keep reading.
The Operation of a Gate Valve
A gate valve has similar functions to other valves. Turning the handwheel raises or lowers the gate on the stem via the threads, opening the valve. For a gate valve to fully open or close, it takes more than one 360° rotation. The inlet and exit are opened when the gate is raised, providing the media with an unhindered path of travel. The gate closes and obstructs the flow of media when it is lowered. For a gate valve, the relationship between the vertical movement of the gate and the flow rate is nonlinear, with the biggest variations happening close to total closure. When used to control flow, the valve’s service life is shortened by gate and seat wear as well as potential gate vibrations due to the comparatively high velocity of the flow at the partial opening. A gate valve should only be used for on/off control as a result.
Methods of Gate Valve Actuation
There are three primary types of gate valve actuation methods which are the manual gate valve, pneumatic gate valve and the electric gate valve. A manually turned handwheel is used to open or close a manual gate valve. This calls for a user to spin the wheel locally. The most cost-effective gate valve is a manual one, especially since gate valve usage after installation is often modest. Instead of a handwheel, a pneumatic actuator is used in a pneumatic gate valve. The actuator can spin the stem to raise or lower the gate by applying compressed air to it. This enables remote control operation without a person present but necessitates the presence of a pneumatic system. A handwheel is replaced with an electric motor in an electric gate valve. The actuator spins the stem to raise or lower the gate using electrical power. As a result, it can be controlled remotely without a user present, but it still needs access to electricity which is additionally known as motorised gate valves.