Check Valve 304/316

• Customization: Available
• Standard: DIN, ANSI
• Material: Stainless Steel
• Connection: Welding
• Size: 1/4"-6"
• Applying Medium: Water Oil Gas
• MOQ: 50PCS
• Shipment Time: 25days
• Transport Package: Carton, Plywood Case
• Specification: ISO, CE
• Trademark: YUZHENG
• Origin: Wenzhou, China
• HS Code: 7307190000
• Production Capacity: 50, 000PCS

Product Description

CHECK VALVE

This sanitary check valve delivers zero dead-angle flow, bubble-tight unidirectional sealing and automatic flow cut-off without manual operation. 
It reaches Class VI zero leakage standard and has passed 3A & CE certification. It fits dairy, beverage, pharmaceutical and purified water pipeline systems, with a 1,000,000-cycle service life. Moreover, we supply SS304/SS316L material options and multiple connection types to match your requirements.

Product Description

1.Ultra-low Leakage Rate & Million-level Cycle Life
*GB/T 13927-2022,Leakage Class VI,max leakage 0.01mL/min
Leakage Rate Performance 
Wafer check valves deliver outstanding tight-shut-off performance for industrial piping. Fine-finished sealing surfaces minimize fluid leakage under rated test pressure. It efficiently blocks medium reverse flow, safeguarding pumps and upstream process equipment against back-flow damage.
Durability & Cycle Life 
Engineered for heavy-duty cyclic service, these check valves complete one-million-cycle endurance validation. Wear-resistant internal parts preserve consistent sealing after countless opening-closing actions. Long service cycles cut on-site maintenance and part-replacement expenditure for continuous production lines.

2. Superior Corrosion Resistance & Mechanical Strength

-Built for Harsh Industrial Working Conditions

*Heavy-Duty Material Selection
This H12W-25P threaded check valve adopts premium 304 / 316L stainless steel. Precision-cast construction provides great mechanical strength, impact resistance, and reliable acid-alkali corrosion protection, well-suited for chemical, water treatment and general industrial threaded piping.
*480+ Hours Salt Spray Performance 
The stainless-steel valve body passes over 480-hour salt-spray testing, maintaining intact surface without rust or corrosion.
*Premium Stainless-Steel Properties 
304 stainless steel delivers PRE ≥18; molybdenum-alloyed 316L reaches PRE ≥24, offering excellent chloride-resistance. The robust threaded check valve stays stable under demanding field service environments.

Specification

Product Type	Wafer Check Valve / Swing Check Valve / Dual Plate Check Valve
Standards	EN 1092-1, ASME B16.5, ASME B16.10, GB/T 13927
Nominal Diameter	DN40-DN600 / 1½"-24"
Nominal Pressure	PN10, PN16, PN25, Class 150, Class 300
Body Material	Cast Iron, Ductile Iron, Carbon Steel, SS304, SS316
Disc Type	Swing Disc / Dual Plate / Lift Disc
Seat Material	EPDM, NBR, FKM, PTFE, Metal Seat
Connection Type	Wafer, Lug, Flanged, Threaded
Operating Temperature	-40°C to 450°C depending on seat and body material
Cracking Pressure	0.01 MPa / 0.03 MPa / 0.05 MPa optional
Sealing Performance	Bubble tight / Leakage rate conforming to GB/T 13927
Application	Water, oil, gas, steam, chemical media
Application	Water, oil, gas, steam, chemical media
Seal Leakage Performance	Class VI zero leakage, max leakage ≤0.01ml/min
Cycle Lifespan (Check Valves)	Up to 1,000,000 open-close operations
Thread Specification (Threaded Fittings)	ANSI B1.20.1 NPT thread, Series 3000 pressure rating
Standard Pipe Fixed Length	6 meters per standard pipe section
Max Hydraulic Working Pressure (Precision Tubing)	Up to 350 bar
Available Certifications	ISO9001, CE, optional 3A / FDA for hygienic applications
Inspection Documentation	EN 10204 3.1 mill test certificates available upon request
Installation Modes	Flanged butt-weld, socket weld, threaded NPT, wafer clamping

APPLICATION AND POSITIVE FEEDBACK

Strict Pre-shipment Inspection

Reliable Performance & Repeat Orders

Real Unboxing & Positive Reviews

We conduct comprehensive checks on all valves before delivery, including product performance, surface finish and order quantity. Every cargo batch will be verified thoroughly, so you can receive flawless goods without any worries.

Our valves deliver reliable performance that satisfies overseas clients thoroughly. Many customers will expand their product selection and arrange second orders after receiving and checking our cargo.

Overseas customers take real photos and videos of unpacking our valves after receiving cargo, and send us sincere thanks for reliable product quality.

Packaging & Shipping

Company Profile

Zhejiang Yuzheng Valve Technology Co., Ltd.

Founded in 2011, Yuzheng is a comprehensive valve manufacturer integrating production, R&D, sales and trade. Based in Wenzhou — China's largest valve manufacturing base — we follow the concept of "winning by quality". With advanced equipment, sophisticated craftsmanship and strict management, we have earned a solid reputation in the industry.Our diverse product range meets global standards and has been trusted by clients across Europe, Russia and other international markets. Backed by years of innovation, certifications and proven project experience, we deliver reliable solutions tailored to the world's most demanding industrial needs.

1,Core Strength & Certifications:We hold ISO 9001:2015 certification, multiple national utility model patents, and China's Special Equipment Manufacturing License, proving our reliable technical strength and product quality.

2,Advanced Production & Testing:Equipped with advanced production facilities, complete testing instruments and mature processes, we ensure the stability and reliability of every product with strict quality control.

3,Professional Technical Team:Our experienced technical team actively adopts new technologies, processes and materials, continuously optimizing products to meet high standards of performance and safety.

4,Global Customer Service:We deliver professional valve solutions to global clients, focusing on quality and long-term partnerships.

Qualifications, Honors & Certifications

We hold a full range of authoritative certifications, including ISO 9001:2015, ECM , EAC,PED product certificates, China Special Equipment Manufacturing License, and Intellectual Property Management System Certificate. These prove our products meet international standards and ensure reliable quality.
 We also own multiple national utility model patents for valve design and manufacturing, covering core technologies such as sealing performance and structural optimization, reflecting our strong R&D and innovation capabilities.

Core Strengths

Production Capacity	We are equipped with 3 machining centers, 33 CNC lathes, plus sandblasting, polishing and sawing machines (total over 150 units), with a daily output of 2,600 pieces to support stable mass production. We have also established rough processing and component cooperation factories in Anhui and Oujiangkou to realize controllable upstream and downstream production.
Quality Control	Raw materials are 100% inspected with full traceability; SS304 ≥8% nickel, SS316 ≥10% nickel, exceeding industry standards. We adopt strict IQC, IPQC, FQC control. All products are dimensionally checked within 0.1mm tolerance with regular sampling. Sealing performance and sizes are strictly verified, with qualified and defective goods sorted separately. Every valve passes 100% air-tight & high-pressure testing, with all records filed completely. With 3 workshop labs and ISO 9001 system, final pre-shipment inspection ensures zero defects.
Technical & Customization Services	We have a team of 3 professional engineers (many with over 5 years of experience), supporting new model design and CAD drawing. With 20 skilled workers in our factory, we offer OEM/ODM customization according to your drawings, including custom logo, packaging, material and size. MOQ is 1 piece, with no minimum order limit.
Lead Time & Delivery	Sample lead time: 5-7days Bulk order lead time: 30 days In-stock items lead time: 15 days Export-grade packaging (carton/wooden case) with clear marking of name, size, material and quantity, waterproof and dustproof for shipment. Complete documents (packing list, quality inspection report, certificate of origin) are provided in accordance with ISO 9001 requirements.

After Sales Service

Damaged Product Replacement

24/7 Professional Team Support

12-Month Comprehensive Warranty

We offer free replacement for manufacturing defects within the 12-month warranty period. For out-of-warranty or non-quality issues, we provide cost-based replacement. We arrange shipment within 24 hours upon confirmation to minimize customer downtime and operational losses.

Our professional team provides 7×24 phone and online consultation for valve selection, installation and troubleshooting. We offer remote video guidance, emergency on-site response solutions, and build dedicated case files for every after-sales request.

Our 12-month warranty starts from the shipment date, covering key valve components. We bear all parts, labor and standard shipping costs for warranty repairs. Exclusions like improper use and force majeure are clearly specified in our terms.

FAQ

1 Are you a factory or trading company?
We are a factory specialized in manufacturing valves and fitting over 15 years.
And we have obtained ECM compliance verification for ball valves, ISO 9001 certification for valve and fitting manufacturing, Special Equipment Manufacturing License, EAC certification, IP management system certification, and multiple utility model patents, demonstrating our comprehensive compliance and innovation capabilities.
2 Where are the main markets for your products?
We hope to make business with companies from all over the world. And for now, our valves and fittings have been exported to especially in North America, South America, South Asia, Europe and Middle East.
3 Do you have a minimum quantity of the products?
No, we will build a business with you with even 1pc. We believe this cooperation will be a long-term relationship for our high quality, competitive price and good after-sale service.
4 Are samples available to be sent for free?
It depends on what product you need. There are hundreds of products we sell. You can contact us for particular answer.
5 Can you print our Logo on the valves?
Yes, we can totally produce products according to your special request, even manufacture it base on your drawing.
6 What is your lead time?
It's around 30 days normally. If we have the products in stock, it will be about 15days
7 How can I check your factory situation while it's difficult for me to come to China?
We have photos and videos on our website and facebook, It shows every step of the manufacturing.
We also have a showroom in CA, USA. If you have time, you can take a look.
8 How can you guarantee the quality of products?
First of all, we have the numerical control device to manufacture products accurately. Then our quality inspectors will test products one by one to make sure every valve or fitting we sell is qualified.
9 How long is the quality guarantee period?
We supply 6 to 12 months for quality guarantee according to customers' using frequency.