A gate valve controls the flow of media by raising the gate (opening) and lowering it (closing). gate valves are distinguished by a straight, unobstructed passage that causes minimal pressure loss across the valve. Unlike butterfly valves, the gate valve's open bore also allows a pipe cleaner to pass through during pipe cleaning. gate valves are available in a variety of options, including various sizes, materials, temperature and pressure ratings, and gate and bonnet designs.
Gate valves work by inserting a rectangular gate or wedge into the path of the flowing fluid. They are operated by a threaded stem that connects an actuator (usually a handwheel or motor) to the stem of the gate. If the valve has a rising stem, its position can be seen by looking at the position of the stem.
Gate valves tend to be slightly cheaper than ball valves of the same size and quality. They are slower to actuate than right angle rotary valves and are suitable for applications where valve operation is infrequent, such as isolation valves. Gate valves should be used fully open or fully closed, rather than regulating flow. Automatic gate valves exist with electric or pneumatic actuators, but manual gate valves are cost-effective because they are used infrequently.
As shown in the figure, the main components of the gate valve are the handwheel (A), spindle (B), gasket (C), bonnet (D), valve body (E), flange (F) and gate (G). The main operating mechanism is simple and straightforward. Turning the handwheel rotates the stem and moves the gate up or down through the threads. They require more than 360° of rotation to fully open/close the valve. Lift the gate from the flow path and the valve opens. Lowering the gate to its closed position seals the bore and causes the valve to close completely.
For gate valves, the relationship between gate vertical travel and flow rate is non-linear, with the maximum change occurring near closure. When used to regulate flow, the relatively high flow rate when partially open can cause wear on the gate and seat, as well as possible vibration of the gate, which can shorten the life of the valve.
The most common causes of gate valve failure are wear and corrosion. Gate valves can wear out over time. Corrosion can cause the disc to become stuck in the open or closed position. The stem from the handle to the valve flap often breaks when the handle is forced, rendering the valve inoperable.
A gate valve controls the flow of water by raising or lowering the inner gate using a twist-type handle or knob located at the top of the valve. Gate valves should never be used to control flow - they are designed to be completely open (allowing full flow) or completely closed (completely stopping flow).
The proper way to open a gate valve is to gently turn the handle counterclockwise (to the left) without applying excessive force - do not "pull" on the handle. A typical 1" water main control valve will take about six full turns to fully open. Stop turning as soon as there is any resistance.
A gate valve works by inserting a rectangular gate or wedge into the path of the flowing fluid.
The gate valve is operated by a threaded rod that connects an actuator (usually a handwheel or motor) to the rod of the gate.
The gate valve controls the flow of fluid by raising (opening) and lowering (closing) the disc or gate.
The gate valve functions by lifting a rectangular or circular gate out of the fluid path.
When the valve is fully open, the gate valve is full bore, which means that nothing is impeding the flow because the gate and pipe diameters have the same opening.
Due to the variety of materials of construction, valve internals products and design combinations available for gate valves, they are suitable for a wide range of applications. From high-temperature coking plants to food and pharmaceutical services, gate
The gate valve is the most common valve in water supply systems. It represents a linear motion isolation valve with the function of stopping or allowing flow.
The gate valve is used to isolate specific areas of the water supply network during maintenance, repair work, new installations, and to reroute the flow of water throughout the pipeline.
The gate valve is named after the closing element that slides into the flow to provide a shut-off function, and therefore acts as a gate.
The gate valve is simple in design and can be used in many low pressure drop services, making it one of the most commonly used valves today.
The gate valve is designed to be a full flow valve. This means that the size of the valve port is the same as the inner diameter of the connecting pipe.
The full bore gate valve flows through the fluid without impeding the flow and does not cause a pressure drop in the pipe. This also allows the pipe to be cleaned with a cleaning purge.
The valve body is the largest element of the gate valve. Since the spindle remains in the valve body during rotation, an economical bonnet construction can be achieved.
The gate valve controls the flow of water by raising or lowering the inner gate using a rotating handle or knob located at the top of the valve.
The gate is used as the opening and closing part of the gate valve. The direction of movement is perpendicular to the direction of fluid flow.
A gate valve can be defined as a valve that uses a gate plate or wedge-shaped disc that moves perpendicular to the direction of flow to start or stop the flow of fluid.
A gate valve restricts the flow of water by inserting a dam ("gate") in the flow path and works in a manner similar to the action of a sliding gate.
Gate valves tend to be slightly cheaper than ball valves of the same size and quality. They are slower to actuate than right angle rotary valves and are suitable for applications where valve operation is infrequent, such as isolation valves.
Gate valves are not suitable for throttling volumes. Due to the design of the valve, flow control is difficult as the partially open gate of fluid flow can cause severe damage to the valve.
Gate valves can be divided into two main types: parallel and wedge. Parallel gate valves use a flat gate plate between two parallel seats. The popular type is the knife gate valve with a sharp edge at the bottom of the gate.
Best Gate Valves 