Ball check valve

NPTthreadedhexagonal

Product Details
Part name: Internal Check Valve
Brand: AJL
Place of origin: Suzhou, China
Body material: 316SS / 304SS (customizable)
Ball material: YG6 tungsten carbide alloy
Spring material: INCONEL X-750
Seal material: PTFE (soft seal)
Standard interfaces: 1/8-27NPT, 1/4-18NPT, 3/8-18NPT (non-standard customization available)

Product Introduction
AJL Internal Check Valve is a high-pressure one-way valve with a soft-seal ball structure, designed for lubrication and sealing systems of ball valves, gate valves and wellhead equipment in oil, gas and water treatment applications. It prevents backflow and ensures reliable one-way sealing under severe conditions.

Detailed Description
The valve features a stainless steel body (316SS or 304SS), a YG6 tungsten carbide ball, INCONEL X-750 spring and PTFE soft seal. Rated operating pressure is ≤10000 PSI with operating temperature range from -50°C to 200°C. Standard connection sizes are 1/8-27NPT, 1/4-18NPT and 3/8-18NPT; non-standard ports can be customized to match specific equipment.

Key Advantages

• High-performance materials: 316SS/304SS body, YG6 ball, INCONEL X-750 spring and PTFE seal for corrosion and wear resistance across a wide temperature range.
• High pressure & reliable sealing: Soft-seal ball design with rated pressure up to 10000 PSI; passed hydraulic test 35–135 MPa for 2 minutes and air test 0.6–0.8 MPa for 2 minutes.
• Compact, service-friendly design: Hex socket interface for simplified installation and maintenance; spring-loaded soft seat provides accurate one-way operation.

Connection Options
Standard NPT ports: 1/8-27NPT, 1/4-18NPT, 3/8-18NPT. Non-standard threading and configurations available on request to suit wellhead and valve fittings.

Applications
Used in lubrication and sealing systems of critical valves and wellhead equipment in oil extraction, natural gas transmission and water treatment to prevent backflow and support long-term safe operation under harsh conditions.

Brand & Origin
Brand: AJL
Manufactured in Suzhou, China with established machining and quality controls.

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, NPT check valve, PTFE seal check valve, INCONEL spring check valve, tungsten carbide ball

Technical specifications

• Part name: Internal Check Valve
• Product type: Internal Check Fittings
• Interface specifications: 1/8-27NPT, 1/4-18NPT, 3/8-18NPT (customizable)
• Body material: 316SS or 304SS (customizable)
• Ball material: YG6 tungsten carbide alloy
• Spring material: INCONEL X-750
• Seal material: PTFE (soft seal)
• Working media: Petroleum, natural gas, water
• Operating pressure: ≤ 10000 PSI
• Hydraulic test: 35–135 MPa for 2 minutes
• Air test: 0.6–0.8 MPa for 2 minutes
• Operating temperature: -50°C to 200°C
• Place of origin: Suzhou, China
• Brand: AJL