ZSPQ pneumatic cut-off valveAdopting a soft sealing structure, it is designed with working and maintenance seals, with small operating torque, moderate sealing pressure ratio, reliable sealing, sensitive action, easy automatic control through hydraulic control, long service life, and widely used in industries such as petroleum, chemical, metallurgical, papermaking, pharmaceutical, electroplating, etc.

Performance parameters of pneumatic cut-off valve:

1. Work pressure: 1.6Mpa-42.0Mpa;
2. Working temperature: -196+650 ℃;
3. Drive modes: manual, worm gear, pneumatic, electric;
4. Connection methods: internal thread, external thread, flange, welding, butt welding, socket welding, sleeve, clamp;
5. Manufacturing standards: National standards GB, JB, HG, American standards API, ANSI, British standards BS, Japanese JIS, JPI, etc;
6. Valve body material: copper, cast iron, cast steel, carbon steel WCB、WC6、WC9、 20 #, 25 #, forged steel A105、F11、F22、 Stainless steel, 304, 304L, 316, 316L, chromium molybdenum steel, low-temperature steel, titanium alloy steel, etc.

Pneumatic On-off ValveAdopting a new series of GT and AT pneumatic actuators, with double acting and single acting (spring reset), gear rack transmission, safe and reliable; The large-diameter valve adopts a series of AW type pneumatic actuator fork type transmission, with a reasonable structure and large output torque, and is available in double acting and single acting types.

1. Gear type dual piston, with large output torque and small volume;
2. The cylinder is made of aluminum material, which is lightweight and aesthetically pleasing;
3. Manual operating mechanisms can be installed at the top and bottom;
4. Rack type connection with adjustable opening angle and rated flow rate;
5. The actuator can be equipped with live signal feedback indicators and various accessories to achieve automated operation;
6. The IS05211 standard connection provides convenience for the installation and replacement of products;
7. The adjustable screws at both ends provide a ± 4 ° adjustable range for standard products between 0 ° and 90 °. Ensure synchronization accuracy with the valve.

Maintenance method for pneumatic cut-off valve:

Improper combination or installation of pneumatic cut-off valve pipelines can generate various stresses, such as thermal stress generated by high-temperature media, stress caused by uneven tightening force during installation, and stress caused by certain human collisions on the pneumatic cut-off valve and its pipelines.

These stresses act on the pneumatic cut-off valve and its pipelines, which can easily affect the performance of the pneumatic cut-off valve. In severe cases, it can affect the regulating system itself, causing deformation of the valve stem and guide components and inability to align with the valve seat center; For pneumatic cut-off valves with split valve bodies, it may cause the valve body flange to detach; Stress may also cause valve seat leakage, etc. Therefore, it is necessary to ensure that stress is avoided or eliminated at all times and directed away from the pneumatic cut-off valve.

Pneumatic shut-off valves and related accessories used in explosive hazardous areas should be checked for their safe operation, such as whether the sealing cover is tightened, the operation of safety barriers, power supply, etc., to ensure that the pneumatic shut-off valve and related accessories can operate safely. The good position for installing a pneumatic cut-off valve is to align the stroke direction of the valve stem with the actuator above the valve body in a vertical plane.

If the pneumatic cut-off valve must be installed in a position that allows the valve stem to move horizontally, or when the direction of movement of the valve stem has a certain inclination angle with the horizontal plane, the actuator should be supported so that all components of the pneumatic cut-off valve are in a natural state. If no support is added or if the support is not properly added, it may cause the valve stem and seat of the pneumatic cut-off valve to be misaligned, which can easily lead to differential deformation or leakage of the packing. Even if the pneumatic cut-off valve has fixed and supporting measures, it must be inspected regularly, usually every 2-3 months.

The packing and oiler need to be readjusted after short-term use. In dusty environments, plastic or rubber sleeves should be used to protect the packing box and guide parts around the valve stem. In situations where corrosive gases or droplets are present, special protective measures should be taken. Generally, anti-corrosion bags should be used to wrap the pneumatic cut-off valve, but care should be taken not to affect its operation. In situations where fire resistance is required, special fire-resistant coatings, fireproof bags, and other methods can be used. The material of the fireproof bag contains multiple layers of ceramic fibers or glass fibers.

Gas source is one of the key energy sources for driving pneumatic cut-off valves. Although the membrane chamber of the pneumatic cut-off valve does not consume air, if the air source system contains impurities such as moisture and oil, it can cause blockages and malfunctions in accessories such as valve positioners and relays. Therefore, it is necessary to regularly inspect the gas source and power supply to ensure that the gas source is clean, dry, and the power supply is reliable.

Pneumatic cut-off valves should be fixed with dedicated brackets to prevent loosening and ensure their overall vertical or horizontal position. If transported over long distances, it is generally shipped in sturdy wooden crates.

After assembling and painting the pneumatic cut-off valve, and installing accessories such as the actuator, handwheel, and positioner as required, in order to prevent foreign substances from entering the pneumatic cut-off valve, all air interfaces connected to the pneumatic cut-off valve should be blocked, and protective covers should be installed on the connecting flanges. Attention should be paid to the status of various connecting parts, such as the valve positioner intake pipe and the actuator interface. Any protruding accessories that are easily damaged, such as pressure gauges for oil injectors and potentiometers, should be removed from the connector, packaged separately from the pneumatic cut-off valve, and transported together.