Pneumatic Gate Valves
Good Supplier presents the Pneumatic Gate Valves dedicated to the automatic shut off of heavy fluids lines like slurries and powder.
The Pneumatic Gate Valve is a heavy-duty unit with cast body, knife gate, stuffing box with packing, and oversized air cylinder or manual hand crank.
A gate valve controls the media’s flow by lifting the gate (open) and lowering the gate (closed). A gate valve’s distinct feature is the straight-through unobstructed passageway, which induces minimal pressure loss over the valve.
The unobstructed bore of a gate valve also allows for a pig’s passage in cleaning pipe procedures, unlike butterfly valves.
Gate valves are available in many options, including various sizes, materials, temperature and pressure ratings, and gate and bonnet designs.
Gate valves tend to be slightly cheaper than ball valves of the same size and quality.
However, they are slower in actuation than quarter-turn valves and are for applications where valve operation is infrequent, such as isolating valves.
Gate valves should be either fully open or fully closed, not to regulate flow.
Automated gate valves exist with either an electric or pneumatic actuator, but a manual gate valve is cost-effective since they have infrequent usage.
One reason gate valves are generally not used to regulate flow is that the fluid flow rate is not proportional to the amount that the valve is open.
Moreover, a partially open gate valve may suffer from vibration in which the valve may move from its assigned position.
Also, the gate and seat may be subject to excessive wear if the valve is partially open.
Product Description
What is the working principle of a Pneumatic Gate Valve?
Gate valves are generally operated by a handwheel, a valve T-key (wrench), or an actuator. The wheel is attached to a valve stem and transfers rotational energy to it. During the gate valve opening, the rotation of the handwheel turns the threads of the gate stem into the gate and vice versa for closing.
This energy moves the gate valve wedge downwards or upwards. In addition, an extension spindle is attached in underground gate valve installations, which allows operation without direct access to the valve itself.
A gate valve’s main components are body, seat, gate, stem, bonnet, and actuator.
The primary operation mechanism is straightforward. Turning the handwheel rotates the stem, which moves the gate up or down via the threads. Therefore, they require more than one 360° turn to open/close the valve fully.
When the gate is lifted from the path of the flow, the valve opens, and when it returns to its closed position, it seals the bore resulting in a full closure of the valve.
Product features
For a gate valve, the relationship between the gate’s vertical travel and the flow rate is nonlinear, with the highest changes occurring near shutoff.
When used to regulate flow, the relatively high velocity of the flow at partial opening results in gate and seat wear, which along with possible vibrations of the gate, shortens the valve’s service life.
Gate valves are more commonly used in refineries and petrochemical plants where pressure remains relatively low, but the temperature may be very high.
Gate valves are used in almost all fluid services such as air, fuel gas, feedwater, steam, lube oil, hydrocarbon, and most of any other services.
Some special gate valve is used in slurry and powder product also such as knife gate valve.
What are some advantages of gate valves?
⦿ Pressure drop during operation is significantly less
⦿ Most of the gate valve can be used as bi-directional
⦿ They are suitable for high pressure and temperature application and required less maintenance
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