Bellows valve structural characteristics and industry standards

Bellows valves undergo a series of rigorous inspection and test procedures. Including 100% gas seal and no leak test test. For the bellows with vacuum requirements, the vacuum gas tightness test can be performed with a helium mass spectrometer leak detector.

Bellows valve structure features:

1. The valve body and valve cover are connected with studs with simple structure and good process performance.

2. The stem of the valve not only has the stuffing box of the general valve, but also in the lower part of the stuffing box, there is a movable sealing element - stainless steel bellows in the upper part of the valve chamber, and the medium is enclosed in the valve cavity outside the valve stem. Into the stuffing box, so the valve is more reliable than the general valve to prevent leakage, to ensure the seal of the valve stem and valve cover connection.

3. The stem nut uses surface nitriding to increase surface hardness and wear resistance, preventing bite phenomenon.

4. The flange bolts are made of high-strength alloy steel and have excellent high temperature creep resistance and are safe and reliable.

5. Bellows design in the valve cover cavity to avoid direct flushing with the media, improve the service life of the bellows.

6. The corrugated pipe is overlapped by 2~4 times to prevent the leakage of the valve due to the damage of the single layer of the corrugated pipe and prolong the service life of the valve.

7. Due to the long design of the bellows, the opening height is high, the main resistance of the fluid is reduced, and the flow resistance coefficient is small.

8. Double sealing with packing and bellows to achieve zero leakage.

Bellows valve design and manufacture and acceptance of the standard design and manufacture according to GB/T12224, DIN3202, DIN3239, ASMEB16.34, API602, MSS-SP-117.

Inspection and testing according to API598, JB/T9092, DIN3230.

Mark MSS-SP-25.