What is a pressure seal valve?

The Forged Pressure Seal Valves utilize a pressure seal bonnet designed to improve bonnet sealing performance as pressure increases. The valves are an excellent choice for high temperature and pressure applications such as steam applications because the higher the pressure, the better the sealing characteristics.
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Plus type fully equipped

CNC machine tools ,large vertical lathes, drill press, milling lathe grinding machine , Welding machine , separate metal working workshops and many general machine tool etc.

Multiple tests

Material analysis, PMI Material analysis. Chemical analysis. Low temperature test, Tensile Test ,Impact test, Hardness test. Wall thickness test, roughness test. Torque test. NDT Inspection (MT,PT,UT,RT). HIC test ,SSC test . Intercrystalline corrosion Test ,Uniform corrosion Test.

Passed ISO certification

The company is the first one to pass ISO 9001(2008),ISO 14001 ,OHAS 18001 international quality system certificate, China pressure pipe safety registration certificate (AZ), European Union safety registration certificate (CE0036), and American Petroleum Institute Certificate (API 6D) and (API607) .

Industry Association Member

We are one of the member unit of China Valve Association as well as China Gas Association, member unit of first class supplying network of CNPC and member unit of fittings supplying network of State Power Corporation.

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EDVC VALVE CO.,LTD.is a specialized in valve manufacturing enterprise with more than 15 years of history.We main produce Top Entry Ball Valve, Fully Welded Ball Valve, Arc Valve, Aluminum Bronze Valve, Automatic Recirculation Valve, Orbit Ball Valve, Safety Valve, Globe Valve, Tilting Disc Check Valve and Rising Stem Ball Valve etc.


The products have been exported to Austria, France, Germany, United Kingdom ,America, Middle East and Asia, Africa . areas and countries. Moreover, the products are widely used in the fields of oil & gas, Oil refinery, Petrochemical,power station ,Sewage treatment, pharmacy, Paper mills, pipeline industry , mining industry , chemical industry and environmental protection.

We are a professional manufacturer of valves in China, with the aim of "providing the first class products and services". On behalf of all of the members at EDVC Valve, we thank you for the opportunity to earn your business.

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A segmented thrust ring maintains the load

The beauty of the pressure seal design is that as system pressure builds, so does the load on the Bonnet and, correspondingly, the pressure seal gasket. Therefore, in pressure seal Valves, as system pressure increases, the potential for leakage through the body/Bonnet joint decreases.

Good sealing

The Forged Pressure Seal Valves utilize a pressure seal bonnet designed to improve bonnet sealing performance as pressure increases. The valves are an excellent choice for high temperature and pressure applications such as steam applications because the higher the pressure, the better the sealing characteristics.

Application field of pressure self-sealing valve

Product type: On-off valves, which are used in the power industry, petroleum, water supply engineering in urban construction, chemical engineering and other fields.

Design features of pressure sealing valve

1 Pressure self-sealing bonnet design
2 Optional bypass design
3 Optional double packing with spacer ring design (gate valve and globe valve)
4 The stainless steel surfacing layer in the gasket contact area ensures reliable pressure self-sealing performance
5 Internal MLM rocker pin design without external leakage point (check valve)
6 Optional Y-shaped lifting design
7 Inclined flap design (swing check valve)

Frequently Asked Question

Do you have any question?

In the tough world of High pressure, High temperature valve applications, Pressure seal gate Valve continue to provide a wide range of industries with a safe, leak free, pressure containing boundary.

Pressure seal Valves are available in many material qualities such as A105 forged and Gr.WCB cast, alloy F22 forged and Gr.WC9 cast; F11 forged and Gr.WC6 cast, austenitic stainless F316 forged and Gr.CF8M cast; for over 500°C, F316H forged and suitable austenitic cast grades.

Studs/nuts/bolts are tightened to prescribed torques in a pattern defined by the manufacturer to affect optimal sealing. However, as system pressure increases, the potential for leakage through the body/Bonnet joint also increases.

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