The advantages and disadvantages of the cut-off valve

The advantages and disadvantages of the cut-off valve The cut-off valve is the valve that moves the closing member (valve) along the centerline of the valve seat. The cut-off valve, also known as the cut-off valve, is a forced-to-close valve, so when the valve is closed, pressure must be applied to the valve to force the sealing surface not to leak. When the medium enters the valve from below the valve flap, the resistance to be overcome by the operating force is the friction between the stem and the packing and the thrust generated by the pressure of the medium. The force of the closing valve is greater than the force of the opening valve, so the valve stem The diameter should be large, otherwise there will be stem bending failure.

Disadvantages 1, large fluid resistance, greater force required to open and close.

2, does not apply to particles, viscosity, easy to coke the medium.

3, poor regulation performance.

4. The bellows sealing globe valve adopts the design of bellows sealing, which completely eliminates the shortcomings of the quick and easy leakage of common valve stem packing seals. It not only improves the use of energy efficiency, increases the safety of production equipment, reduces maintenance costs and frequently Maintenance, but also provides a clean and safe working environment.

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

2, external leakage, and in line with international sealing standards;

3, no fluid loss, reduce energy loss, improve plant equipment safety;

4, long service life, reduce the number of maintenance, reduce operating costs;

5. The robust bellows seal design ensures zero leakage of the stem and provides maintenance-free conditions.