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23 maj 2012 · Install a sealing-type valve cap fingertight. A valve cap has two functions to perform. The first is to keep dirt from damaging the valve core sealing surface. The second, is to provide an air seal for the valve. A valve cap, therefore, must be durable. The black plastic cap that sometimes comes on a new tube is not a valve cap
The stem of a gate valve is responsible for allowing control of the gate. It must be strong enough to not buckle or break under the required thrust and torque for operating the valve while resisting corrosion and wear of external element and internal media and maintaining a seal at the packing box.
4”-16” UL/FM PERFORMANCE INFORMATION. Valve complies with Underwriters Laboratory standard UL 262. Valve is rated at 200psi working pressure. Valve is capable of bubble-tight seal at twice the rated pressure (400psi) for short periods of time.
Gate valve with spigot ends for asbestos cement pipes to ISO class 18. For drinking water and neutral liquids to max. 70°C Test/Approvals: AVK gate valves are designed with built-in safety in every detail. The wedge is fully vulcanized with AVK’s own drinking water approved EPDM rubber compound.
Knife Gate Valve LVC STEM COVER FEATURES • Stem covers protect the stem from falling debris and are not necessarily dust tight. For dust tight covers, consult the factory. • NOTE: The lower stem cover may reduce the opening stroke of the valve.
1. Valves shall conform to the latest revision of AWWA Standard C515 covering resilient seated gate valves for water supply service. 2. The valves shall have a ductile iron body, bonnet, and O-ring plate. The wedge shall be totally encapsulated with rubber. 3. The sealing rubber shall be permanently bonded to the wedge per ASTM D429. 4.
Stem Shield™ provides ideal protection for stem threads on stem and yoke gate valves. Stem Shield is a simple, cost-effective safeguard for workers who could come into contact with exposed industrial valve stems, potentially causing injury or infection.
