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Hardness testing of pump valve castings and valve for fluid control.

May 15, 2018

Main pump valve castings is control unit in the pipeline fluid conveying system, the main valve is used to change the channel cross-section and flow direction of medium, when making use of a regulating valve castings, throttling, globe, check, etc. Function.

Pump valve castings are mainly used for fluid control valves, so that they range from the simplest cut-off valves to the various valves used in the most complex automatic control systems. Product can be used to control water, steam, oil, gas, mud, all kinds of corrosive medium, liquid metal and radioactive fluid and other types of fluid flow, working pressure valves are available from 0.1 MPa to 420 MPa pressure, working temperature from 196 ℃ ultra-low temperature to 650 ℃ high temperature.

Although the welding zone of the pump valve casting is qualified through non-destructive inspection, the hardness of the weld zone should be checked again when machining, which is also an inspection of the stress treatment effect. If the tempering temperature is not enough, or the time is insufficient, it will cause the welding area to be high.

It is necessary to use the hardness value to identify and test the pump valve castings. In this paper, a portable grinder is used to gently grind the welding area, and a portable brinell hardness tester is used to hammer three points, and the hardness value of the weld area is compared with the hardness value of the steel castings. If the hardness value of the two regions is similar, it is indicated that oxyacetylene is basically successful.

Pump valve castings manufacturers to ensure that the valve casting industry energy saving target is completed, need to do a good job in these two aspects of one is for new business in access to energy consumption, especially in medium and small casting enterprise; Second, we will adopt effective energy saving measures and eliminate backward production capacity to existing enterprises. To the existing valve casting enterprise of energy conservation as the top priority, in the fierce competition in the market environment, the valve casting enterprise in order to survive, is in constant change enterprise development train of thought, with the development of the market, conversion marketing model.http://www.dmgcastings.com/