The difference between isolation valve and control valve
1. Open and close the air circuit. When valve 1 and valve 4 are closed and valve 2 is open, the mechanical vacuum pump III will evacuate the container I, and the air flow will flow through the pre-vacuum pumping pipeline; when valve 2 is closed and valve 4 is open, the mechanical pump can Vacuum the diffusion pump alone; when valve 1 and valve 4 are opened at the same time, the diffusion pump and the mechanical pump can work simultaneously to evacuate the container, and the air flow flows through the diffusion pump at this time. It can be seen that the role of the valve in this operation is to switch the air path and change the flow route of the air flow.
2. Control the size of the air flow and adjust the vacuum degree. In Figure 1, the opening angle of the valve cover of valve 1 can be adjusted to adjust the flow of air flowing through the pipeline; valve 2 and valve 4 can be closed, and the mechanical pump can be fed through the air release valve 3. The inlet of III is put into the atmosphere; the vacuum degree in the container can be adjusted through the vent valve 5.
3. Quantitative inflation. There is a small hole with a certain volume on the plunger of the glass valve. When the small hole turns to the right and connects with the high-pressure gas cylinder, the small hole can be filled with high-pressure gas; when it turns to the left and connects with the vacuum container , just put the volume of high-pressure gas into the container, so as to play the role of quantitative inflation.
There are many types of vacuum valves, which are usually classified according to the function, structure type, driving mode, material and use of the valve.
ZJHP pneumatic single-seat control valve
ZJHP type pneumatic single-seat control valve is small in shape, light in body, high in performance and large in capacity. It is a new generation of general-purpose control valve products that meet IEC standards. It is suitable for the production process control system of general fluid medium and process conditions.
ZMAN(P)(M) Pneumatic Film Control Valve
ZMAN(P)(M) pneumatic film regulating valve is a commonly used pneumatic actuator. It adopts a balanced valve core structure, with small axial unbalanced force and good stability. The valve stem should not vibrate and the allowable pressure difference is large. , low noise, large flow capacity, and strong adaptability, so that it is suitable for occasions with large flow, large pressure difference, and low leakage requirements
ZJHP, ZJHM fine and small pneumatic film straight through single seat, sleeve regulating valve
ZMABP, ZMABN type pneumatic film straight-through double-seat regulating valve
ZJHQ, ZJHX type pneumatic film three-way confluence and diversion regulating valve
This series of products has two types: three-way confluence and three-way diversion. The nominal pressure is PN16, 40, 64; the nominal diameter range is DN25-300. The applicable fluid temperature is from -60°C to +450°C. Leakage standard is level Ⅳ. There are two types of flow characteristics: straight line and parabola.
ZXS New Series Pneumatic Film Angular Single Seat Control Valve
ZXS new series of pneumatic thin-film angular single-seat control valve adopts top-guiding structure, equipped with multi-spring actuators, and has the advantages of compact structure, light weight, sensitive action, large valve capacity, S streamlined fluid channel, small pressure drop loss, and high valve capacity. Large, accurate flow characteristics, easy disassembly and assembly, etc.
ZXX (Q) type pneumatic thin film three-way high temperature regulating valve
ZXX (Q) type pneumatic thin film three-way high temperature regulating valve adopts a tube-shaped thin-walled window-shaped valve core structure, which is different from the bushing guide of the plunger-shaped valve core. Equipped with a multi-spring actuator, it has the advantages of compact structure, light weight, small volume, and convenient disassembly and assembly.
ZXN pneumatic film straight through double seat regulating valve
ZXN new series pneumatic film double-seat regulating valve adopts double-guided structure and is equipped with multi-spring actuators. It has the advantages of compact structure, light weight, sensitive action, large valve capacity, accurate flow characteristics, and convenient disassembly and assembly.
ZXM pneumatic film through sleeve regulating valve
ZXM new series pneumatic film sleeve regulating valve is a kind of pressure balance regulating valve. Equipped with a multi-spring actuator, the overall mechanism is compact, light in weight and good in stability. The fluid channel is S streamlined, with small pressure drop loss, large allowable pressure difference, low noise and large flow capacity.
ZXP pneumatic film straight through single seat regulating valve
The new series of ZXP pneumatic thin-film straight-through single-seat regulating valve adopts a top-guided structure and is equipped with a multi-spring actuator. It has the advantages of compact structure, light weight, sensitive action, S streamlined fluid channel, small pressure drop loss, large valve capacity, accurate flow characteristics, and convenient disassembly and assembly.
The above is the difference between the isolation valve and the control valve. Hurry up and collect it and read it slowly. It is very detailed~