What appropriate material is used as gate valve and check valve?
Answer:
Type of use determines type of material. Carbon steel would be good for your application unless the ph of the water would cause them to corrode excessively, then you could go with bronze or stainless.
I'd go with a brass valve. Good spots to purchase: local contractor's supply store or wholesaler of sprinkler systems.
Your out of range of many plastic valves out there so be sure to check the specs.
302 or 304 Stainless Steel works well for me
Stellite material.
*WCB/carbon steel/cast steel as a body material and S.S.304 for valve trim is the best choice for gate valve and check valve.
*In blow-down of boilers , brass/gun metal is used as its consists of muds and debris which can cause corrosion.
*Other materials are depends on size and flow rate:
CF8, CF8M, CF3, CF3M, 304L, 304, 306, 306L
*Gate/Flapper sealing surfaces are having SS/Hard faced and its matching seat also to take care of wear.
Carbon steel casing with stainless steel internal wear parts(seat ring, trim, spindles,fasteners) is considered suitable for above feed water service . Rating shall be ANSI class 300 .
Valves are produced from a range of materials, from carbon steel through nickel alloys and including High Strength Super Austentic material.
Carbon steel at the correct pressure rating is fine.
The Valve Seats in the bodies of the valves are of hardened steel as are those of the gate in the gate valve and the 'Flapper' (or the 'Piston or Ball of a 'Lift' type of check valve).
The hardened steel minimises erosion, corrosion and damage to the seats.
The feed water is, (or should be) treated to remove dissolved solids and oxygen and maintained at a slightly basic pH of around 8.5 to prevent corrosion by acid gases like CO² and SO².
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