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Union Check Valve

    Union Check Valve

    Union Check Valve, also widely known as union non-return valve or true union check valve, is a one-way automatic control valve specially designed for industrial pipeline systems. It relies on medium fluid pressure to open and close automatically, effectively preventing reverse flow of liquid, gas and oil media in pipelines. Featuring an integrated union connection structure, this valve solves the installation and maintenance pain points of traditional flanged and threaded check valves, enabling quick on-site assembly, disassembly, replacement and routine maintenance without removing the entire...
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1. Product Overview

Union Check Valve, also widely known as union non-return valve or true union check valve, is a one-way automatic control valve specially designed for industrial pipeline systems. It relies on medium fluid pressure to open and close automatically, effectively preventing reverse flow of liquid, gas and oil media in pipelines. Featuring an integrated union connection structure, this valve solves the installation and maintenance pain points of traditional flanged and threaded check valves, enabling quick on-site assembly, disassembly, replacement and routine maintenance without removing the entire pipeline. It is one of the most essential core accessories for oil and gas exploitation, chemical processing, water treatment and industrial fluid transmission systems.
Adopting a precision ball or lift type internal structure, the union check valve delivers sensitive response, stable sealing performance and low flow resistance during operation. The streamlined inner cavity reduces medium turbulence and pressure loss, improving the overall transmission efficiency of the pipeline system. The union connection design realizes flexible butt joint with standard pipe fittings, featuring strong universality and high compatibility. All sealing components are optimized for long-term cyclic working conditions, resisting wear, aging and medium corrosion. With zero manual operation required, the valve can operate continuously for a long time, effectively protecting upstream and downstream pipeline equipment, pumps, instruments and process units from damage caused by backflow, water hammer and pressure impact.
Available in multiple material configurations including stainless steel, carbon steel and alloy steel, the valve adapts to different working conditions such as high pressure, low temperature, corrosion and high viscosity. It is widely applicable to onshore and offshore oilfields, natural gas transmission pipelines, petrochemical plants, water supply and drainage systems, as well as municipal industrial fluid projects. Compact in structure, lightweight and highly reliable, it has become the preferred one-way control valve for global industrial pipeline supporting projects.

2. Technical Specifications & Parameters

Parameter Item
Technical Standard
Product Name
Union Check Valve / True Union Non-return Valve
Applicable Sizes
DN15 – DN100 (1/2” – 4”)
Main Body Material
SS304, SS316L, Carbon Steel, Alloy Steel
Sealing Material
EPDM, FPM (Viton), PTFE, Silicone
Working Pressure
PN16 – PN100 (16Bar – 100Bar)
Working Temperature
-40℃ ~ +180℃ (Depends on sealing material)
Connection Type
Threaded Union / True Union Connection
Structure Type
Ball Type / Lift Type
Cracking Pressure
0.125PSI – 0.5PSI (Customizable)
Applicable Media
Oil, Natural Gas, Water, Chemical Liquid, Industrial Fluid
Execution Standard
API, ISO9001, CE, GB Standard
Feature Advantages
Quick installation, zero leakage, low resistance, easy maintenance

3. Company Profile

Sanmen Machinery Co., Ltd. is a professional integrated manufacturer and exporter specializing in oil and gas pipeline valves, Downhole Tools and fluid control equipment. Located in Yantai City, Shandong Province, the company focuses on R&D, customized design, precision manufacturing and global sales of industrial valves and petroleum supporting equipment for more than 18 years. The product range covers full-series pipeline valves, wellhead equipment, downhole operation tools, sealing parts and oilfield chemical reagents, providing one-stop fluid control solutions for global oilfield, chemical and industrial pipeline projects.
The company owns standardized intelligent manufacturing workshops, equipped with advanced CNC machining equipment, high-pressure testing laboratories and non-destructive testing devices. All union check valves undergo strict raw material inspection, precision machining, pressure resistance testing and sealing performance detection to ensure stable quality and long service life. Adhering to international API and ISO production standards, we support personalized customization of special pressure, special temperature and special medium-resistant valve products according to customer working conditions.
With a factory direct sales model, we eliminate intermediate links and provide cost-effective products and professional technical services. Our products are exported to more than 30 countries and regions in the Middle East, Southeast Asia, Africa and Latin America. We have established a complete after-sales service system, providing customers with product selection guidance, installation debugging and full-life-cycle technical support, winning long-term trust and cooperation from global clients.


 FAQ

Q1: What is the difference between union check valve and ordinary check valve?
A1: The biggest advantage of the union check valve is the integrated union connection structure. It can be installed and disassembled independently without cutting or removing the pipeline, greatly reducing maintenance time and cost. Compared with ordinary check valves, it has higher sealing accuracy, lower flow resistance and stronger adaptability to complex pipeline environments, which is more suitable for frequent maintenance industrial and oilfield pipeline systems.
Q2: Can this valve be used for high-pressure oil and gas pipeline working conditions?
A2: Yes. Our union check valve supports a maximum working pressure of 100Bar. High-pressure and corrosion-resistant models with alloy steel materials are available for oilfield crude oil, natural gas and high-pressure chemical fluid pipelines. All products pass strict hydraulic pressure and sealing tests to ensure stable operation under high-pressure working conditions.
Q3: Do you support customized specifications and special materials?
A3: We provide full customized services. We can adjust valve body materials, sealing materials, pressure grades and connection sizes according to customer’s special working conditions such as ultra-low temperature, strong corrosion and high viscosity media, to meet diverse project matching requirements.
Q4: What is the delivery cycle and quality guarantee policy?
A4: Standard models are in stock with fast delivery. Customized models take 7–15 working days. All products are strictly inspected before delivery with complete certification documents. We provide long-term after-sales technical support and spare parts replacement services to ensure stable operation of customer pipeline systems.
Q5: What certifications can be provided for export?

A5: Our union check valves comply with ISO9001 quality system certification and CE certification, and meet API industry standards. We can provide factory inspection reports, pressure test reports, material certificates and complete export documents to support customers’ customs clearance and project acceptance.


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Related tags： Production Engineering Oil Production Equipment Distribution Gas Lift Valve

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Sanmon Machinery Equipments Co., Ltd. founded in 2010, is located in the beautifulcoastal city - Yantai of China. We are an integrated company for Oil & Gas Equipment ApplicantResearch, Customized Design, Order Production and Global Sales, We provide professional productsand services to the Oil and Gas Industrial Customers over 20 countries and regions. Our productscover Sucker Rod Pump Jack, Pump, Sucker rod and Accessories, Wellhead and X-mas Tree, Valves,Completion Tools, Artificial lift Equipment, Flow Control Equipment, Coil Tubing Tools, OilfieldWork Vehicles, Chemicals & Additives, Wire-line Tools, etc., and we supply Well CompletionService, Coil Tubing Work Service, snubbing service, Down-hole Pipe Cutting Work, ArtificialLifting Work, Special Tools and Vehicles Renting Service and other related services. Longcareered engineer and technicians, ISo and API strict quality control factory and excellentsales team are always our exclusive advantages.

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