Hydraulic Seals, Oil & Gas Seals, API6D & LNG Seals

About JST-Seals

JST Seals is a leading manufacturer of high-performance seals for countless industries including construction, oil and gas, LNG, wind power, chemistry, and coal mining. For over 29 years, we are committed to our philosophy of "reliable sealing solution" and "excellent experience" with superior quality, reasonable price, and fast delivery.

As the first API Q1 certified seal supplier in China, we combine advanced R&D, strict quality control, and global logistics to serve customers in over 50 countries.

29+

Years Experience

50+

Patents & Inventions

50+

Countries Covered

API Q1 Certified in China

Industries We Serve

Construction Industry

Long-lasting seals for hydraulic systems in excavators, cranes, and heavy machinery. Designed for extreme reliability and energy efficiency.

• Long lasting
• Reduce energy consumption
• High efficiency

Oil & Gas Industry

High-performance sealing solutions for drilling, exploration, completion, production, and intervention under harsh conditions.

• Chemical compatibility
• High temperature resistance
• Extended service life

API6D & LNG

Cryogenic sealing solutions for LNG compressors, valves, transfer pumps, and fueling systems operating from -196°C to 121°C.

• Cryogenic performance
• Thermal stability
• Dimensional reliability

Petrochemical & Semiconductor

FFKM and PTFE seals resistant to aggressive chemicals, ultra-pure environments, and high-temperature processes.

• Ultra-purity compliance
• Chemical resistance
• High-temperature stability

Our Products

ESY Series Fugitive Emission Ball Valve Stem Seal

PTFE/PEEK seal for dynamic ball valve stem applications with low emission compliance.

Ball Valve Stem Dynamic Seal API 6D

Seal Stack for Well Tools Sliding Sleeve

Multi-component seal assembly with Elgiloy spring for downhole sliding sleeve applications.

Downhole Seal Sliding Sleeve Valve Assembly

Bidirectional High-Pressure Ball Valve Seat

Robust sealing solution for API 6D ball valves under high-pressure bidirectional flow.

API 6D High Pressure Face Seal

FFKM O-Rings for Semiconductor Manufacturing

Perfluoroelastomer seals with extreme chemical resistance and ultra-purity for wafer processing.

FFKM Semiconductor Chemical Resistant

Weco Hammer Union Seals for Oil & Gas

Brass and elastomer seals for hammer unions in flow lines and wellhead equipment.

Weco Flow Lines 1502 Seal

LNG Nozzle Spring Energized Seals

Cryogenic seals for LNG injection and fueling systems with Elgiloy springs.

LNG Cryogenic -196°C

Ring Type Joints for Valve Pressure Testing

BX style and nylon ring gaskets for high-pressure valve testing and sealing.

BX Gasket Pressure Test Nylon Ring

Hydraulic PTFE Seals (SPNS, SPGW, SPGO)

Step seals, piston seals, and wear rings for high-pressure hydraulic cylinders.

PTFE Hydraulic Wear Ring

View All Products

Why Choose JST-Seals?

API Q1 Certified

We are the first and only API Q1 certified seal manufacturer in China, ensuring the highest quality standards.

29+ Years Expertise

Since 1995, we’ve been designing, manufacturing, and testing seals for the most demanding industrial environments.

Global Reach

Serving customers in over 50 countries with fast delivery and technical support.

R&D Innovation

50+ patents in sealing technology, continuous development of new materials and configurations.

Customer-Centric

Customization, fast response, and long-term partnerships built on trust and performance.

Full Range Solutions

From hydraulic seals to cryogenic FFKM O-rings, we offer comprehensive sealing systems.

Frequently Asked Questions

What industries do JST-Seals serve?

We serve the construction, oil & gas, LNG, petrochemical, semiconductor, wind power, and coal mining industries with specialized sealing solutions.

Are JST-Seals API certified?

Yes, JST is the first and only API Q1 certified seal supplier in China, ensuring compliance with international quality standards.

Can you customize seals?

Yes, we offer full customization services including material selection, dimensions, and performance testing to meet specific application requirements.

What materials do you use?

We use PTFE, FFKM, HNBR, PEEK, Elgiloy, rubber, and phenolic resins depending on temperature, pressure, and chemical exposure requirements.

What is the temperature range of your cryogenic seals?

Our cryogenic seals operate from -196°C to 121°C, ideal for LNG and aerospace applications.

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High-Performance Seals for Demanding Industries