Gate, Globe & Check Valves

Quality Manufacturing, Stringent Testing & Non-Destructive Evaluation (NDE)


HH Valves Limited undertakes extensive measures to ensure the utmost integrity, safety, reliability and longevity of its products.

All pressure containing castings are manufactured to meet the requirements of ASME B16.34 Level 3 for all types of defects. All castings are visually inspected to meet the requirements of MSS SP-55. We also perform further non-destructive testing (NDE) to verify the more stringent stipulations of ASME B16.34, including Radiographic Examination (RT), Ultrasonic Examination (UT), Magnetic Particle Examination (MT) and Liquid Penetrant Examination (PT).

We perform surface volumetric examination as standard by Magnetic Particle Examination (MT) and Liquid Penetrant Examination (PT) on all high pressure containing forgings in accordance with ASME B16.34, Section 8, paragraph and Mandatory Appendices II & III respectively. Further non-destructive testing (NDE) of high pressure containing forgings is performed to verify the more stringent stipulations of ASME B16.34 by Ultrasonic Examination (UT).

During the manufacturing process castings and forgings are randomly inspected to verify the above basic quality Level 3 criteria is being maintained, and liquid penetrant inspection of the weld deposit overlays for the seat and wedge/disc components is also performed on a random sample basis in accordance with the requirements of HH Valves’ quality procedures.

HH Valves has its own in-house pressure test facilities and can accommodate third party inspection visits if and when requested.

All machined butt-weld end profiles are dye-penetrant checked at our factory before despatch. All valves are hydrostatically and pneumatically tested in accordance with the requirements of BS EN ISO 12266-1 and/or API598 before despatch. 

We also use specialist sub-contractors to carry out other methods of NDE such as radiographic, ultrasonic and magnetic particle examination of pressure containing castings and forgings and also to conduct in-house positive material identification (PMI) of valve castings, forgings and components plus fugitive emission testing of valves.

HH Valves specialises in the fitting, setting and testing of electric, pneumatic and hydraulic actuators to valves. Each valve is individually stroke tested to ensure proper operation and pressure tested to verify seat tightness against the specified design or operating pressure.

HH Valves has both ISO 9001 and PER (PED) accreditation in accordance with 2014/68/EU. All valves are supplied with HH Valves certification meeting the requirements of EN 10204 Type 3.1. Valves can also be supplied with EN 10204 Type 3.2 certification where independent verification of pressure containing castings and forgings has been carried out. Original mill certification for pressure containing cast and forged components can also be supplied upon request.

After test, all valves are drained, dried and internally protected with a propriety de-watering agent and protective oil. End connections are protected with purpose-made plastic covers or hardboard/plywood end caps. All valves leave our facility painted and protected in accordance with the relevant standards or customer requirements.