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  QUALITY

  Jireh Valve has partnered with a series of companies active in the field of valve engineering. We have employed a large number of CNC machines for most of valves fabrications.

  Each piece of our product is tested repeatedly, covering Chemical Analysis, PMI (Positive Material Identification), Hardness, Wall Thickness and Hydraulic Tests, to make sure the items you received are made to work thru the intended design life.

  Our QC workshop has equipment for pressure tests, mechanical property tests, X-ray tests and ultrasonic and magnetic particle examination etc.

Cryogenic treatment

A cryogenic treatment is the process of treating workpieces to

cryogenic temperatures (i.e. below −190 °„C (−310 °„F)) to remove

residual stresses and improve wear resistance on steels.

Benefits of cryogenic treatment includes longer part life,

less failure dut to cracking, improved thermal properties,

better electrical properties including less electrical resistance,

reduced coefficient of friction, less creep and walk, improved flatness,

and easier machining.

Cryogenic Test(low temperature test)

Standard: BS 6364: 1998 Valves for cryogenic service

Cooling Medium: Liquid Nitrogen

Test Medium: He

Test temperature: -196°ś

Soak the valve in the cooling medium until the body temperature is fixed. 

Operation Test: 

Open and close the valve under test temperature and nominal pressure

for 20 times. Make sure the operation is smooth, and no obstructive,

no crawl occurred.

Leakage Test: 

Closed the valve under test temperature and nominal pressure.

Filled the valve with He according to the flow direction. Report the leakage rate.

Make sure there is no visible leakage for soft seal valve. For metal seal valve,

the rate should be 0.1DN mL/s.

Sealing Test:

Open the valve. Increase the pressure to nominal pressure and keep it for 900s.

Check the tightness of packing, connecting part between body and bonnet.

Make sure there is no visible leakage.  

Name

Test pressure /MPa

Keeping Time /s

Results

Sealing test

Pc

900

No visible leakage

Leakage test

Pc

300

Leakage Rate
mL/s

Soft seal

No visible leakage

Metal Seal

0.1DN

Operating test

operation is smooth, and no obstructive, no crawl occurred

Copyright @2012 XIAMEN JIREH INDUSTRIAL CO., LTD. Incorporated. All rights reserved.
 
Adds: 1105 Block B Yucheng Bldg.No.51 Dongdu Road, Xiamen, China Post Code: 361012
Tel: 0086-592-5616848 5616881 5616805 5616458 Fax:0086-592-5616958
E-mail: jireh@jirehvalve.com;     xmjireh@189.cn Site: http://www.jirehvalve.com