API 674 GB/T 9234-2008 Combined valves,conical valve.plate valve. Low pressure accumulator,high pressure damper. Hot water, Assembly type: ... used: 304ss,316ss,316L ss,1Cr18Ni9Ti, 420ss,1045,4140)Heat treatment is applied to prevent fatigue crack.Crank shaft (material ... special specification can be provided to the users. high pressure steam boiler feed water pump,high pressure boiler feed water ...