The Engineering Sector And Industry Uses Many Types Of Valves
Specialised industrial valves are used in many industries and there are many types of valves, each designed for a specific purpose. Manual globe valves, for example, are one of the simplest types of valves. These are often made of bronze with bronze internals and soft seats. Other types are made of stainless steel and may have either bronze or stainless steel internals with soft seats. Fire-safe certified types of valves are almost always made of stainless steel with stainless steel internals and metal-to-metal seats.
Besides these manual globe valves, there are many other types of valves too, like cryogenic gate valves. Cryogenic gate valves are especially effective when the efficiency of the system is dependent on a low valve pressure drop. These types of valves may employ a Teflon (PTFE) wedge face for minimal leakage rates that may otherwise not be achievable with gate valves.
Ball valves are typically made of austenitic stainless steel, bronze and gunmetal and these types of valves are ideal for cryogenic applications. Features that make these types of valves particularly suitable for cryogenic applications include anti-blowout stem and one-piece design; the relief hole that prevents liquefied gases from becoming trapped; the spring-loaded gland seal that gives low torque levels under both cryogenic and ambient conditions and the removable centre assembly that allows inter-changeability in existing installations. In addition, these types of valves are suitable for retrofitting of pneumatic or electric actuators.
Safety relief types of valves are normally made of the same materials as ball valves. These types of valves are made in many derivatives and are designed for the protection of road-going and static storage tanks against over-pressurisation. There are several basic sizes (depending on the throat diameter) and these types of valves are designed to re-seat over 92% of a set pressure and factory-set to lift repeatedly within plus-minus 2% of the set pressure. For more information on all these and other types of valves, contact us today.