Interface Specifications: 1/8-27NPT, 1/4-18NPT, 3/8-18NPT, non-standard customization accepted

Product Type: Internal Check Fittings

Application Scope: Lubrication of ball valves, gate valves, and wellhead equipment

Body Material: 316SS, 304SS, non-standard customization accepted

Working Medium: Petroleum, natural gas, water

Performance Specifications:

• High water pressure test: 35–135 MPa for 2 minutes

• Air pressure test: 0.6–0.8 MPa for 2 minutes

Seal Material: PTFE

Product Structure: Soft-sealed ball valve

Place of Origin: Suzhou, China

Brand: AJL

Ball Material: YG6 tungsten carbide alloy

Operating Pressure: ≤ 10,000 PSI

Operating Temperature: -50°C to 200°C

Spring Material: INCONEL X-750

Product Introduction

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Brief Description

AJL Internal Check Valve (soft-seal ball structure) is designed for lubrication systems of ball valves, gate valves, and wellhead equipment in oil, gas, and water treatment industries. It effectively prevents backflow. Made of 316SS/304SS body, YG6 tungsten carbide ball, INCONEL X-750 spring, and PTFE soft seal, it withstands pressure up to 10000 PSI and operates between -50℃ and 200℃. Standard connections include 1/8-27NPT, 1/4-18NPT, 3/8-18NPT. Customization is available for reliable one-way sealing under severe working conditions.

Detailed Description

AJL Internal Check Valve (INTERNAL CHECK FITTINGS) is a high-pressure one-way valve designed for the oil, natural gas, and water treatment industries. It is widely used in the lubrication and sealing systems of ball valves, gate valves, and wellhead equipment to effectively prevent medium backflow and ensure safe and stable operation.

Key Advantages

High-performance Materials

Body made of 316SS/304SS stainless steel (customizable), ball made of YG6 tungsten carbide alloy, spring made of INCONEL X-750, and seal made of PTFE. Excellent corrosion resistance, wear resistance, and sealing performance, stable in extreme temperatures from -50℃ to 200℃.

High Pressure & Reliable Sealing

Soft-seal ball structure, rated working pressure up to 10000 PSI (approx. 68.9MPa). Passed high hydraulic pressure test (35–135MPa for 2 minutes) and air pressure test (0.6–0.8MPa for 2 minutes), ensuring no leakage under high pressure.

Compact & Efficient Structure

Hex socket design for easy installation and maintenance. The soft seat and spring provide accurate one-way operation to prevent backflow and maintain stable lubrication system performance.

Flexible Connection Options

Standard ports include 1/8-27NPT, 1/4-18NPT, 3/8-18NPT. Non-standard customization is supported to match various wellhead equipment and valve connections.

Applications

Widely used in critical valves and wellhead equipment lubrication systems for oil extraction, natural gas transmission, and water treatment. As a core one-way control component, it prevents backflow and supports long-term, safe operation under harsh working conditions.

Brand & Origin

AJL brand, manufactured in Suzhou, China. With mature machining and strict quality control, we provide highly reliable valve accessories for the global oil, gas, and water treatment industries.

Keywords

Internal check valve, soft seal check valve, high pressure check valve, wellhead check valve, oil and gas check valve, stainless steel check valve, AJL check valve, check valve manufacturer, NPT check valve, PTFE seal check valve, INCONEL spring check valve, hex socket check valve