Wafer Type Butterfly Valve (UL/FM Certified): Comprehensive Technical & Selection Guide (WD-371X & WD-371G/L)
time：
2026-10-26
Explore Ningjin APC Industries' UL/FM certified wafer type butterfly valves. Featuring 300 PSI working pressure ratings, EPDM encapsulation, and robust ductile iron construction for high-rise fire protection systems.
Technical Disclaimer: The key technical parameters in this article are derived from China's first-tier UL/FM fire protection valve enterprise Ningjin APC Industries' official fire protection butterfly valve technical documentation (used as actual production reference for Ningjin APC Industries factory fire protection valves and for customers to understand product usage; details can be consulted with the professional team).
Engineering reliable, high-performance flow control infrastructure for commercial and industrial fire protection applications.
A Wafer Type Butterfly Valve is a compact, quarter-turn flow control valve that is "sandwiched" tightly between two pipe flanges using long bolts or stud rods. Engineered specifically to meet rigorous fire protection requirements, these valves deliver superior shutoff performance under demanding operating conditions.
1. Key Features & Design Architecture
Ningjin APC Industries manufactures advanced fire protection valves engineered for strict industry compliance. The standard models—such as the WD-371X (with Signal Gearbox) and WD-371G/WD-371L (with Gearbox or Lever)—share robust structural traits:
Compact & Lightweight
Features a very short face-to-face length, making it ideal for tight spaces where larger gate or ball valves will not fit.
Quarter-Turn Operation
Rotates the internal ductile iron EPDM-encapsulated disc 90 degrees to move from fully open to fully closed.
Resilient Seat Liner
Uses an integrated soft EPDM rubber seat liner that covers the body and acts as a built-in flange gasket.
Flange Compatibility
Designed to fit standard pipe flanges including ANSI 125/150 and DIN 2501 PN10/16 specifications.
2. Technical Specifications & Material Knowledge Graph
Selecting a certified Wafer Type Butterfly Valve requires verifiable performance parameters. Below are the official technical parameters and material compositions for Ningjin APC Industries models:
| Parameter / Specification | Official Value / Compliance Details |
|---|---|
| Available Pipe Sizes | 2", 2-1/2", 3", 4", 5", 6", 8", 10", 12" |
| Connection Standards | ANSI 125 / 150, DIN 2501 PN10 / PN16 |
| Maximum Working Pressure | 300 PSI (conforms to UL1091, ULC/ORD-C1091, FM 1112) |
| Maximum Testing Pressure | 600 PSI |
| Working Temperature Range | 0°C ~ 80°C / 32°F ~ 176°F |
| Top Flange Mounting Standard | ISO 5211 |
| Global Approvals & Listings | UL, cUL, FM, VDS, CCC, CE, NSF/ANSI 61 & NSF/ANSI 372 (Lead-Free Available) |
| Coating Details | Epoxy coated or custom coating upon request |
Valve Component Material List (WD-371X / WD-371G / WD-371L)
3. Operational Advantages & Important Limitations
✔ Operational Advantages
- Cost-Effective: Requires less raw material to manufacture and offers lower shipping and installation expenses compared to traditional gate valves.
- Low Operating Torque: The balanced disc design needs less force to turn, enabling smooth operation via lever, gearbox, or automated actuators.
- Bi-Directional Sealing: Provides tight shutoff regardless of the direction of liquid flow.
⚠ Important Limitations
- No Dead-End Use: Unlike lug-style valves, a Wafer Type Butterfly Valve relies on the clamping force of both mating flanges. Downstream piping cannot be disconnected without the valve dropping out or losing seal.
- Full System Shutdown Required: Maintenance on either side of the valve requires completely shutting down and draining the pipeline section.
Frequently Asked Questions (FAQ)
Q1: What are the working conditions and application scenarios of Ningjin APC Industries' wafer-type butterfly valves?
A: These valves are designed for indoor and outdoor use in fire protection systems, including fire inflow water lines, drain pipes, high-rise building firefighting networks, and industrial factory building fire protection infrastructure. They operate reliably within a temperature range of 0~80°C (32~176°F) and under working pressures up to 300 PSI.
Q2: What certifications have Ningjin APC Industries' wafer-type butterfly valves obtained, and can they pass acceptance inspections for large-scale overseas fire protection projects?
A: Yes, they hold comprehensive international certifications including UL, cUL, FM, VDS, CCC, CE, and NSF/ANSI 61 & NSF/ANSI 372 lead-free credentials. They fully comply with stringent North American and European fire codes (UL1091 & FM 1112 standards) and routinely pass high-standard overseas engineering project acceptances.
Q3: Can Ningjin APC Industries' wafer-type butterfly valves seamlessly replace major international brands?
A: Absolutely. Manufactured strictly in accordance with ANSI 125/150, DIN2501, and ISO 5211 mounting standards, APC valves feature standardized face-to-face dimensions, identical pressure ratings (300 PSI working, 600 PSI testing), and full UL/FM listings—making them direct, high-quality drop-in replacements for top-tier international brands.
Manufacturer Profile
Ningjin APC Industries Incorporated Company
No. 18 Taishan Road, Ningjin County, Shandong Province, P.R. China
Website: http://www.apc-valve.com/
Email: njcuishusheng@vip.163.com | rain.cui@apc-valve.com
Customer Service Contact
Contact Person: Ms. Cui
WeChat: cuiyuying01
Tel: +86 18600252968 / +86 534 5571078
Fax: +86-534-5216766
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Add：No. 18 Taishan Road, Ningjin County, Shandong Province P.R.China
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