Self-Sealing Check Valve

The self-sealing check valve is an automatic check valve built for extreme operating conditions. It uses a pressure self-sealing design that actually tightens the seal as line pressure increases. 
Specific Applications
These self-sealing check valves are widely used in oil and gas pipelines, refining facilities, chemical plants handling corrosive or acidic fluids, power stations, boiler piping, and industrial water treatment systems. They are suitable for both horizontal and vertical installation.
Key Features
Self‑Sealing Pressure Design – The higher the line pressure, the tighter the seal. Our pressure-seal check valves use a pressure‑energized seal that delivers bubble-tight zero leakage – even under pressure fluctuations or thermal expansion.
Heavy‑Duty Industrial Performance – Rated Class 900 to 2500 lb. Built for industrial and heavy-duty applications: oil/gas pipelines, refining, chemical plants (corrosive/acidic fluids), power stations, boiler piping, and industrial water treatment. Suitable for both horizontal and vertical installation.
Forged Steel Reliability – As a self-sealing check valve, the forged body eliminates casting defects, handling high temperature and high pressure with confidence. The flow path keeps resistance low, while streamlined design reduces wear on moving parts – lowering maintenance costs over time.
Automatic Backflow Prevention – Operates automatically – no external controls needed. Provides reliable protection against reverse flow in critical systems.
Fully Customizable – Body materials: carbon steel, stainless steel, or special alloys. End connections: flanged, threaded, or welded to DIN, ANSI, JIS, BS, or GB. Custom sizes and special ratings available on request.
Quality Certification
We hold ISO 9001, ISO 14001, and ISO 45001 certifications, plus a special equipment production license (TS). Our products are made to API, ANSI, JIS, ISO, BS, JB, and GB standards. This covers material checks, non‑destructive testing, precise measurements, and valve strength/sealing performance.
Custom Manufacturing Services
You send us a drawing or sample, and we review the requirements. Then we confirm the drawing and give you a quote — faster if you provide a 3D model. After order confirmation, we schedule batch production.