Premium Check Valve for Corrosion-Resistant Heavy-Duty Industrial Solutions

Product Description

Introduction to products

Our Stainless Steel Swing Check Valve (NPS 1/2"–2", DN15–DN50) is a precision-crafted device ensuring reliable, corrosion-resistant flow control for industrial systems. Made from premium CF8/CF8M stainless steel and tested to GB/T 13927 standards, it provides automatic, leak-tight one-way flow control for water, oil, steam, chemicals, and food-grade liquids.

Ideal for pump stations, HVAC, chemical lines, or potable networks, this valve ensures system integrity by preventing reverse flow, thus protecting pumps, fluids, and operations.

Typical Applications
Water supply & treatment: Municipal networks, pump stations, fire protection systems
HVAC & plumbing: Water circulation, tower circuits, feedwater lines
Chemical & petrochemical: Corrosive media handling, dosing systems, process lines
Food & beverage: Hygienic fluid transfer, CIP/SIP installations
General industrial: Compressed air, light steam, condensate lines

NPS	L	D	H
1/2"	65	15	44
3/4"	80	20	53
1"	90	25	58
1-1/4"	105	32	62
1-1/2"	120	40	73
2"	141	50	78

Company Profile

Core Product Range
We specialize in stainless steel (SS304, SS316, SS316L) and carbon steel fluid control components, including:

Ball Valves: 1PC, 2PC, 3PC, Flanged, Three-way, Pneumatic/Electric Actuated.
Industrial Valves: Gate, Globe, Check (Swing/Horizontal), Y-Strainers.
Pipe Fittings: Precision elbows, tees, unions, couplings, threaded/socket-weld fittings.
Quality & Standards
Quality is vital. Our products comply with ANSI/ASME, DIN, JIS, GB standards. Using CNC machines and strict testing (pressure testing, spectral analysis), we ensure every component meets high durability, precision, and safety standards.

Industry Applications
Our solutions serve clients in sectors such as:

Water Treatment & Desalination
Oil & Gas Processing
Chemical & Petrochemical Industries
Food, Beverage, Pharmaceuticals
HVAC and General Industrial Pipelines
Why Partner with Zhejiang Xinhong?
Technical Expertise: Our engineers offer professional support and customized solutions (OEM/ODM) for specific project needs.
Export Excellence: With broad international trade experience, we ensure seamless logistics and documentation for global clients.
Advantage: By refining our processes in China's valve hub, we deliver premium quality at cost-effective prices with reliable lead times.
At Zhejiang Xinhong Valve & Pipe Fitting Co., Ltd., we uphold "Precision in Every Turn." We seek long-term, mutually rewarding partnerships with distributors and industrial partners worldwide.

Packaging & Shipping

Certifications

FAQ

1. What is the difference between PN and Class pressure ratings?
Answer: PN is a European rating (e.g., DIN, GB) in bar (e.g., PN16 equals 1.6 MPa). Class is an American rating (ANSI/ASME), like Class 150. They differ due to reference temperatures and material strength.
2. How to choose between Stainless Steel 304 and 316?
Answer: SS304 is a versatile stainless steel for non-corrosive media. SS316, with Molybdenum (Mo), offers superior chloride corrosion and pitting resistance, ideal for marine, chemical, or highly corrosive settings.
3. What are "Soft Seats" and "Metal Seats"?
Answer: Soft Seats use elastomers or plastics (e.g., PTFE/Teflon) for excellent sealing (<200°C). Metal Seats use metal-to-metal contact for high temperature, pressure resistance, and durability, though with higher allowable leakage.
4. Can NPT and G threads be used interchangeably?
Answer: No. NPT is an American Taper Pipe Thread (60° angle). G is a parallel thread (British BSPP, 55° angle). Mixing them causes seal failure or thread damage.
5. What is the difference between a Swing Check Valve and a Lift Check Valve?
Answer: A Swing Check Valve's disc swings on a hinge, offering lower flow resistance, used in large-diameter pipelines. A Lift Check Valve's disc moves vertically, better sealing, used in small-diameter pipes.

6. Why do ball valves get damaged easily in a half-open position?
Answer: Ball valves are for full-on/off service. Half-open, high-velocity flow erodes seats and causes "wire drawing," shortening lifespan. For throttling, use globe or control valves.
7. What are Full Bore and Reduced Bore ball valves?
Answer: A Full Bore valve matches pipe ID, minimal flow resistance, allows "pigging." A Reduced Bore valve has a smaller port, cost-effective, suitable for non-critical pressure drop systems.

8. What are the common causes of internal leakage in valves?
Answer: The primary causes include:
(1)Impurities (like welding slag or sand) on sealing surfaces;
(2)Erosion or wear of sealing faces;
(3)Valve not fully closed;
(4)Incorrect selection (e.g., exceeding pressure/material limits).
9. How to choose between Double and Single Acting (Spring Return) pneumatic actuators?
Answer: Double Acting actuators need air for both opening/closing and are economical. Single Acting (Spring Return) use springs to reset valve to "fail-safe" (Open/Closed) when air is lost, ideal for safety applications.
10. What are common certifications for valve exports?
Answer: Common certifications include ISO 9001 (Quality Management), CE (EU access), WRAS (UK water safety), and MTC (Material Test Certificate) for traceability.