Technical data
Nominal diameter | DN(mm) | 40-600 | |
Nominal pressure | PN(mpa) | 1.0 | 1.6 |
Test pressure(Mpa) | Shell test | 1.5 | 2.4 |
Test pressure(Mpa) | Seal test | 1.1 | 1.76 |
Appropriate medium | Air,water,sewage,steam,coal gas,oil | ||
Drive modality | Handle,worm gear box, penumatic drive,electric drive | ||
Material for main parts
Parts name | Material |
Body | Ductile cast iron,cast steel,Alloy steel, stainless steel |
Disc | Grey cast iron,ductile cast steel,cast steel,stainless steel and hoc material |
Seal ring | Manifold rubber,such as EPDM, PTFE,NBR,Viton,CR |
Stem | steel,ss420,ss304,ss316 |
Packing | O-ring,flexible graphite |
Butterfly valve seal material choice and apporpriate tempersture
Material variety | Neoprene | Styene rubber | EPDM | PTFE | Silicon rubber | Fluorine rubber |
Resistance highest temperature | 82°C | 93°C | 150°C | 232°C | 250°C
| 204°C |
Resistance lowest temperature | -40°C | -40°C | -40°C | -268°C | -70°C | -23°C |
Suitable working temperature | ≤65°C | ≤80°C | ≤120°C | ≤200°C | ≤200°C | ≤180°C |
Name | Material |
Body | ductile cast iron, WCB, stainless steel |
Disc | ductile cast iron, WCB stainless steel, Al-bronze |
Stem | SS420, SS431 or as request |
Disc seat ring | EPDM |
Body seat ring | SS304 |
Retainer | SS304 |
Shaft bearing | Al-bronze, self-lubricating bearing |
Bolt & nuts | SS304 |
Coating | epoxy coating, thickness: min. 250 microns, color code: RAl5015, 5017, 5010, and etc. |
China National Building Materials Group Corporation (CNBM) was established in 1984 with approval from the State Council, and then became a Central Enterprise under direct supervision of State-owned Assets Supervision and Administration Commission of the State Council in 2003.
Upholding the philosophy of “Making Best Use of Resources to Serve Construction”, and vigorously carrying out such strategies as “technical innovation”, “internationalization of building materials”, and “building strength with talents”, CNBM is the largest comprehensive building materials industry group in China that integrates scientific research, manufacturing and logistics into one entity, and consists of four business platforms, i.e. industry, technology, complete set of equipment, and trading & logistics. As of the end of 2009, CNBM’s total assets exceeded RMB 110 billion, with 100,000 employees, and 20 companies under direct management with 100% share control or majority control, among which 6 were listed companies, including 2 overseas listed.
CNBM practices the parent-subsidiary management system, and is one of those wholly state-owned enterprises carrying out the pilot trial of Board of Directors system and innovation system. As the strategic center, decision center, resources center, and policy & culture center, our Group exercises its right as a contributor. Whereas, our sub-groups functioning as business platforms, are mandated to construct the profit center based on their core competences to enlarge brand awareness and increase market share.
