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What are Pneumatic Gate Valves?

What are Pneumatic Gate Valves

What are pneumatic gate valves?

The pneumatic gate valves are available with the pneumatic actuator, whose working is with the compression of the air for controlling the gate valve. The composition of the pneumatic gate valves is of a wedge shape, and the whole structure is parallel. This makes the pneumatic gate valves fit the emergency cut-offs and discharge the gas or liquid inside the pipelines.

What is the working principle of pneumatic gate valves?

When using air sources for operating the pneumatic gate valves, the small handle can make the pneumatic gate valves work by turning towards the pneumatic. You need to do this for closing and opening the screw rod and nuts. Whenever the compressed air starts entering from the upper portion of the pipeline present in the cylinder, the piston and piston rod in the cylinder start pushing in the straight direction. When the compressed air enters the lower area of the pipeline, the gas starts pushing the piston and rod in the cylinder to move direction upwards. At the exact moment, now it starts driving the stem of the pneumatic gate valves to open the pneumatic gate valves. The screw rod and nut help close and open the pneumatic gate valves when there is no air supply. Firstly, the upper and lower side of the pipe is in a state of exhaustion, and a handle of small size can work manually. In the normal state of meshing, now start turning the handwheel manually in a clockwise direction. It means the closing of pneumatic gate valves. The pneumatic gate valves open when the handwheel is in a counterclockwise direction. When the air source starts flowing in the upper portion of the inlet, the stem drives the plate of pneumatic gate valves downwards to close the pneumatic gate valves. When the air is in the lower portion, the steam drives the plate of pneumatic gate valves upwards for opening the pneumatic gate valves.

figure 1 pneumatic gate valves

How is the selection of pneumatic gate valves in the petroleum and chemical industry?

Although, there are different types of valves available and different working conditions available. So, you need to choose the pneumatic gate valves to install your piping system. But first, you must know the characteristics of pneumatic gate valves and the reasons for their selection. The flowing medium needs a straight path in the petroleum and chemical industries, and resistance is small. It is essential to adjust the pneumatic gate valves for controlling the flow. At the same time, there is also the possibility of using the ball valve and plug valve to reverse and shunt. The sliding of the closing area is with the sealing surface of the pneumatic gate valves, along with the wiping effect is more appropriate for the medium that consists of suspended particles.

Selecting the pneumatic gate valves for controlling the flow:

Generally, the valves help adjust the flow like globe valves. These are closing the valves in a downward direction. It is more appropriate for these conditions because the size of the seat is in direct relation to the stroke of the closing part. There is a disc-shaped gate in the pneumatic gate valves for crosscutting the circular valve seat. It can control the flow better whenever it is in a close position. In present times no matter whether it is the pipeline system of petroleum or chemical industry, the services and working frequencies keep changing. The controlling and eliminating the leakage at low-level, the most important component is pneumatic gate valves. The pneumatic gate valves control the pipeline and deliver reliable performance in various unique industries.

What are the types of actuators for pneumatic gate valves?

Vacuum valves-pneumatic gate valves with the bonnet of copper sealing:

The pneumatic gate valves and the copper sealing range, whose vacuum range is 1X10-10 Torr. It has a slim profile and shortens the path for the gas. There is electropolishing in and out to bring improvement in the corrosion resistance. The working temperature is 392 Fahrenheit.

Pneumatic rotatory actuators for the pneumatic gate valves:

These rotatory pneumatic actuators are extremely helpful in different industries, laboratories, and production applications where there is a need for low-level accuracy. The maximum torque in this actuator for the pneumatic gate valves is 33.2 lbs and is available to work in the pressure range of 40-100 psi. The working temperature is -30 to 180 Fahrenheit.  

Pneumatic linear actuator:

The pneumatic linear actuator is reasonable that consists of a linear resistive transducer internally. It is suitable for applications where the sensing of magnetic positioning is not essential. Moreover, it is also favourable in terms of changes in the cylinder.

Pneumatic and hydraulic linear actuators:

You can find the pneumatic and hydraulic linear actuators in the configurations of spring-return and double-acting. The cylinders have nickel plating, and piston rods of chromium plating are available. There are designs of coupling of the stem of the pneumatic gate valves and hammer blow. The working of this actuator is -22 to 212 Fahrenheit.

Pneumatic linear diaphragm and cylindrical valve actuator:

The working of the pneumatic linear diaphragm and cylindrical valve actuator is reliable and safe enough to make it suitable for a variety of applications. It is a heavy-duty actuator whose design controls the modulation linearly and on/off applications. There is a coating available for corrosion resistance in extreme weather conditions and the chemical and petroleum industries. The working temperature is -4 to 158 Fahrenheit.

Single-acting pneumatic actuator:

The design of the single-acting actuator is for mounting the quarterly turning of the pneumatic gate valves. You can mount this kind of actuator on different ends of the pneumatic gate valves such as flat end, square end, or key. There is also the availability of pressure-controlling signals as the input. Quarterly turning of the pneumatic gate valves is the range of rotatory motion present in a single-acting pneumatic actuator.

Pneumatic diaphragm actuator:

The design of the pneumatic actuator is compact and ready for installation on the pneumatic gate valves. It is available in both single and double-acting appropriate for the mounting of limit switches or positioners according to the requirements of your applications. The working of the pneumatic diagram actuator is on/off.

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