Advantages and disadvantages of pneumatic stop valve

Advantages and disadvantages of pneumatic stop valve:

Advantage:

1. Simple structure, convenient manufacture and maintenance.

2. Small working stroke and short opening and closing time.

3. Good sealing performance, small friction between sealing surfaces and long service life.

4. The structure of the valve body of pneumatic stop valve includes straight through type, direct current type and right angle type. Straight through is the most common structure, but its fluid resistance is the largest. Direct flow fluid has less resistance, and is mostly used for fluid with solid particles or high viscosity. The right angle valve body is mostly forged, which is suitable for the stop valve with small diameter and high pressure.

5. In the process of opening and closing, the friction of the sealing surface is smaller than that of the gate valve, which is wear-resistant.

6. There is usually only one sealing surface, with good manufacturing process and easy maintenance.

shortcoming:

1. The fluid resistance is large, and the force required for opening and closing is large.

2. It is not suitable for medium with particles, high viscosity and easy coking.

3. Poor regulation performance.

4. The design of bellows seal is adopted for pneumatic stop valve, which completely eliminates the shortcomings of aging and quick leakage of common valve stem packing seal, not only improves the energy efficiency, increases the safety of production equipment, reduces the maintenance cost and frequent maintenance, but also provides a clean and safe working environment.

Advantages of pneumatic stop valve:

1. Double seal design (bellows + packing) if the bellows fails, the stem packing will also be avoided;

2. Leakage and meet international sealing standards;

3. No fluid loss, reduce energy loss and improve the safety of plant equipment;

4. Long service life, reducing maintenance times and operating costs;

5. The solid and durable bellows seal design ensures zero leakage of the valve rod and provides the conditions without maintenance.