Our engineers at BelleFlex are experienced with Belleville applications for pumps and valves. Our flange bolting is used regularly in pumps and valves to help eliminate flange leakage. Leaks are caused by factors, such as bolt stretch, gasket creep, and cycles of thermal change. However, by maintaining load on bolted joints, leakage is greatly reduced, if not eliminated. Many materials are available, such as H13 Tool Steel, 17-7 PH
Stainless Steel, and INCONEL 718 and X-750 Alloys.
Belleville disc springs are also important to good valve performance, especially those that are “live loaded”. “Live loading” is a method of using Bellevilles to preserve pre-load in valves. A Belleville is added to the gland follower of a packed valve to create a controlled, sustainable amount of stress in the packing set. Properly executed live loading that uses a BelleFlex Belleville can greatly reduce the likelihood of mechanical failure.
For situations in which there is wide variation in temperature, BelleFlex provides cryogenic flange bolting in a variety of materials. The use of Bellevilles can play a significant role in the reduction of leaks for cryogenic applications. Materials with good cryogenic properties are PH (precipitation hardening) and Carpenter Technology stainless steels. We carry a large in-stock selection of flange bolting for cryogenic applications.
