Norms, category, labour pressing is made clear to satisfy the course of action that purchases a requirement only when valve is purchased, be not perfect in environment of current market economy. Because of the competition of valve production manufacturer for the product, below the conception that all unites a design in valve severally, undertake different innovation, formed respective industry standard and product individual character. Because this is more detailed when valve is purchased put forward technical requirement, coordinate with manufacturer obtain consensus, the accessory that purchases a contract as valve is very necessary.
1. Current requirement
1.1 valve norms reachs a category, should accord with conduit to design the requirement of the file.
The model of 1.2 valve should make clear the GB number requirement of the basis. If industry standard, should make clear the relevant specification of model.
1.3 valve actuating pressure, the actuating pressure of requirement ≥ conduit, below the premise that does not affect the price, valve but susceptive labour is pressed should be more than the work with real conduit to press; Any a side that valve shuts a state to fall should bear labour of 1.1 times valve presses a value and not leakage; Below valve open state, system of a powerful person should stand the requirement that duple valve labour presses.
1.4 valve make a standard, should show the GB number of the basis, if industry standard, purchase company document should be added on the contract.
2. Valve mark is qualitative
Ability of system of 2.1 a powerful person is qualitative, answer to be given priority to with nodular cast iron, make clear a brand to reach cast-iron and actual detect physico-chemically data.
Capable person of staff of 2.2 a powerful person is qualitative, stainless steel of do one's best lever of a powerful person (2CR13) , large requirements valve also should be the lever of a powerful person that stainless steel embeds a bag.
2.3 nut material is qualitative, use casting aluminous brass or casting aluminous bronze, and hardness and intensity all are more than lever of a powerful person.
Material of lining of lever of 2.4 a powerful person is qualitative, its hardness and intensity all should not be more than lever of a powerful person, and do not form electrochemistry to corrode with body of lever of a powerful person, a powerful person below leach bubble state.
The material of 2.5 sealing surface is qualitative: ① valve category is differ, qualitative requirement of sealed means and material is differ; A powerful person of switch of formula of ② common wedge, qualitative, fixed means, abrade means all should show the material of cupreous annulus; ③ is soft sealed brake a powerful person, of stuff of glue of line of board of a powerful person reach sanitation physico-chemically to detect data; ④ butterfly a powerful person should indicate material reachs the sealing surface on body of a powerful person character butterfly board on sealing surface material is qualitative; Their detect physico-chemically data, especially the wholesome requirement of balata, fight function of aging behavior, wear-resisting; Use fourth fine balata and balata of third of 3 yuan of second to wait normally, forbidden mix into uses reclaimed rubber.
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