With the increasing of caliber, if still use single disc swing check valve will enlarge the disc is weight and stroke, and slow the closing time. in the case, it will cause a considerably high impact pressure when meduim flows back , thus damage the moving parts and valve seat, While if the small discs will not close simultaneously. they will close quickly. thus weaken the water impact and largely reduce the damge of sealing surface by water power. impact and largely reduce the damage of sealing surface by water power. This valve is mianly in the water supply and transport pipelines.
1) Size: DN100-DN500
2) Class: 150lb - 900lb
Technical standards:
1) Design and manufacture: API 6D
2) Face-to-face: ANSI B16.10
3) Flange end: ANSI B16.5
4) Inspection and test: API 598
Main materials:
1) Body and bonnet: Cast iron, ductile cast iron, carbon steel
2) Disc: Cast iron, ductile cast iron, carbon steel
Note: We accept design and manufacture of various non-standard valves and arrange production according to users' supplied drawings and samples.
Suitable Medium | Water, Oil, Gas and etc. |
Main material | CAST IRON,ASTM A216 WCB, WCC, WC6, SS304, SS316, CF8, ETC. |
Suitable Temperature | ≤80 |
Nominal Pressure | 150lb--900lb |
Nominal Diameter | DN600-DN1800 |
Flange Dimension | ASME B16.5, BS4504, ISO2531, ISO7005 and other standards conforming to the requirements |
Face to Face Length | API594,BS5155, ISO5752, DIN3352 and other standards conforming to the requirements |
Established in 1985, Zhejiang Guanlong Valve Machinery Co., Ltd. is a professional manufacturer which integrating development, production, sales, installation and service into an organic whole.
Our company mainly manufactures valves according to ANSI, API, DIN, BS, and Chinese GB standards. We are specializing in producing hydraulic control valves, check valves, multifunctional pump control valves, pressure reducing valves, adjusting valves and butterfly valves. There are 6 major series and more than 1000 specifications now.
Our products are exported to worldwide, such as the USA, Canada, Europe, the Middle East and South East and Southeast Asia. With high content of technology and reliable quality, our products have gained good fame from the customers.
After nearly 20 years of development and self-perfection, our products are supported by novel design, excellent structure, elaborate workmanship, exquisite technology and complete testing measures.
We will fully exert our advantage on technology and management to improve continuously our product quality and manufacture high quality valve products to satisfy the customers.