Maintenance and classification of cut-off valves

Pneumatic cut-off valves are all played to the function of quick cut-off, with simple structure, sensitive response, reliable action, and other characteristics. It can be widely used in petroleum, chemical, metallurgical, and other industrial production departments. The air source of the pneumatic cut-off valve requires filtered compressed air, and the medium flowing through the valve body should be liquid and gas free of impurities and particles. Today we will introduce the maintenance methods and types of cut-off valves

Here is the content list

l How to maintain the cut-off valve

l Classification of cut-off valves

How to maintain the cut-off valve

1. The control valve pipeline will produce various stresses due to improper combination or installation, such as thermal stress caused by high-temperature medium, stress caused by uneven fastening force during installation, stress caused by certain man-made collisions on the control valve and its pipelines, etc. These stresses act on the control valve and its pipeline, which can easily affect the performance of the control valve. In severe cases, it will affect the adjustment system itself, resulting in deformation of the valve stem and guide parts and cannot be aligned with the center of the valve seat; For the control valve of the split valve body, it may cause the valve body flange to be disengaged; Stress can also cause leakage of the valve seat, etc. Therefore, at all times, it is necessary to ensure that stress is avoided or eliminated and directed away from the control valve.

2. The cut-off valve and related accessories used in explosive hazardous places should be checked for safe operation, for example, whether the sealing cover is tightened, the operation of the safety barrier, the power supply, etc., to ensure that the regulating valve and related accessories can operate safely.

3. The best position to install the cut-off valve is to make the stroke direction of the valve stem in a vertical plane with the actuator above the valve body. If the support is not added or the support is improperly installed, it may cause the center of the valve stem and the valve seat to be different, which is easy to lead to differential changes or packing leakage and other failures. Even if the control valve has fixed and support measures, it must be checked regularly, generally once every 2~3 months.

Types of globe valves

1. According to the allowable pressure difference, medium characteristics, and process pipeline requirements, the cut-off valve can choose a single-seat, sleeve, or three-way cut-off valve;

2. According to the anti-corrosion requirements and pressure level of the medium, the cut-off valve made of cast iron, cast steel, cast stainless steel, cast alloy steel, and other materials can be selected;

3. According to the medium leakage and safety considerations, the cut-off valve can choose a hard seal, soft seal, bellows seal, and other cut-off valves;

Above, we introduce the maintenance method and classification of the cut-off valve. We are a company specializing in the production of cut-off valves. If you have this need or want to know, you can consult us, we can provide you with satisfactory service.