QUALITY CONTROL

Quality equipment and quality control processes

All valves are executed by quality control systems, reliable inspection tools and trained QC workers, and Zhenghao personnel maintain the highest level of quality for their customers.

Internal quality control equipment for impact testing, hardness testing, tensile testing, chemical composition and mechanical properties laboratories.

1. Valve raw material control: visual and dimensional inspection, PMI, wall thickness, impact test, if required, NDE such as PT, UT, MT, RT.

2. Valve assembly machine process inspection: dimensional inspection, machining surface and part material inspection, special requirements such as NDE test according to order requirements.

3. Valve assembly and performance check: Each valve is tested for hydraulic and air test performance according to the requirements of the order standard.

4. Valve paint, packaging and delivery.

General quality control process

Valve material control: visual and dimensional inspection, PMI, wall thickness, impact test, if required, NDE such as PT, UT, MT, RT.

Valve assembly machine process inspection: dimensonal inspection, machined surface and part material inspection, special requirements such as NDE testing on request.

Valve Assembly and Performance Check: Each valve is tested for hydraulic and air test performance as required by the order standard.Valve paint, packaging and delivery.
 

Special quality CONTORL request

According to customer requirements, special requirements for impact test, radio pattern test RT, low fugitive emission test, high temperature, low temperature and fire safety can be completed.

Low temperature testing: Low temperature and high temperature laboratory facilities, low temperature or high temperature testing according to order requirements. Test the valve to a low temperature test at a low temperature test -196 ° C or -538 ° C high temperature

PMI device. The front material identification device performs a rapid chemical analysis of the incoming raw materials and, after assembly, demonstrates that the materials used are produced and assembled according to the order.

Penetration testing: NDE certified personnel perform PT inspections indoors after or after assembly.

Fire safety test: The fire test facility performs fire test according to the order requirements. This test exposes the valve to a flame of 761 to 980 ° C to verify that the valve is properly sealed.