Pressure Sealed Bonnet Check Valve

Pressure Sealed Bonnet Check Valve Product Information

PRODUCT RANGE:

Sizes: NPS 1/2 to NPS 24 (DN50 to DN600)

Pressure Range: Class 900 to Class 2500

End connection: Butted Welded (BW), Flange RTJ, Flange RF

MATERIALS:

Cast Steel: WC6, WC9, CF8, CF8M, Alloy 20, Monel, Inconel, Hastelloy

Forged Steel: F11, F22, F51, F5, F91, F304, F316, 

STANDARD

Design Features:

• Pressure Sealed Bonnet Design

Sealing performance improves with increasing pressure differential.

• Automatic Control

Requires no external power – operates automatically based on flow direction.

• High-Pressure Resistance

Withstands high pressure/temperature environments, suitable for medium-high pressure applications.

What is a Pressure Sealed Bonnet Check Valves: Automatic Sealing Through Pressure Differential

A pressure sealed bonnet check valve automatically achieves sealing through media pressure differential, integrating the automatic closing function of check valves with the enhanced sealing characteristics of self-sealing structures.

1. Structural Features

Typically composed of valve body, seat, and disc. Common body materials include cast iron, carbon steel, or stainless steel. Discs use metal/non-metallic materials with spherical or disc shapes to ensure flexible operation under various conditions.

2. Working Principle

• Forward Flow

Media pressure pushes the disc open for unobstructed fluid passage.

• Reverse Flow

Backflow forces rapid disc closure by combined media pressure and gravity, while sealing mechanisms enhance effectiveness under pressure to prevent reverse flow.

3. Industrial Applications

• Petrochemical Industry

Applications: Controls unidirectional flow of crude oil, natural gas, and corrosive chemicals under high pressure (up to Class 2500, 42MPa), preventing backflow accidents.

Scenarios: Refining units, storage tank pipelines requiring high-temperature (800°C) and high-pressure resistance.

• Power Systems

Applications: Boiler feedwater systems and steam turbine condensate loops ensuring unidirectional steam flow.

Features: Swing-type design minimizes water hammer during frequent starts/stops and high-velocity flows.

• Metallurgical Industry

Applications: Prevents backflow accidents in molten metal or high-pressure gas pipelines.

Material Requirements: Stainless steel/alloy steel bodies for corrosion and heat resistance.

• Extreme Conditions

High Pressure/Temperature: Forged steel bodies in nuclear power/deep-sea pipelines

Corrosive Media: PTFE-coated discs for chemical waste treatment systems.

Newsway Valves Materials

The China Valve Manufacturer from China, its valves body and trim material can be offered in Forged type and Casting type. Next to Stainless Steel and Carbon Steel material, we also manufacture valves in special materials such as titanium, nickel alloys, HASTELLOY®*, INCOLOY®, MONEL®, Alloy 20, super-duplex, corrosion resistant alloys and urea grade materials.

Available Valve Materials