Design specification：
Design and manufacture: JB/T 11487-2013, API600
Face to face：GB/T 12221, ASME B16.10
End connection size: HG/T 20592, ASME B16.25
Pressure-temperature: GB/T 9131 ASME B16.34 HG 20592
Test-inspection: GB/T13927 GB/T 9092 API 598
Helium mass spectrometry leak detection: API 602 MSS SP-117

Application: For flammable and explosive working conditions, e.g. hot oil, hydrogen, etc.

Design features：
1. the use of double bellows structure, the valve structure is reasonable and more compact.
2. the installation height of the double bellow gate valve designed and manufactured by our

company is 20%~30% lower than that of similar products.
3. the use of double bellows structure, the valve in the process of opening and closing the

force on the bellows is reduced, and the force is more uniform, extending its service life.
4. the use of double-layer bellows, more reliable sealing. The valve is leak-tested by helium

to achieve zero leakage.Especially used in flammable, explosive, highly toxic media pipeline,

 environmental protection and safety.

5. adopt straight-through structure, optimize the flow channel design, the medium

overflow resistance is small, the flow coefficient is large, use more energy-saving.
6. the use of packing, double bellows and stem multi-layer seal, so that the valve to

achieve a true zero leakage