EPDM Seated Butterfly Valves for Fire Protection Systems: Comprehensive Technical Guide
time：
2026-10-28
Explore professional technical insights on EPDM Seated Butterfly Valves by Ningjin APC Industries, featuring 300 PSI working pressure and UL/FM approvals.
📅 Date: October, 2026 | ✍️ Author: Fire Protection Valve Technical Department
1. Definition and Core Function
An EPDM Seated Butterfly Valve is a resilient-seated flow control valve engineered specifically for high-integrity sealing in demanding fire protection infrastructure. Utilizing an Ethylene Propylene Diene Monomer (EPDM) encapsulated ductile iron disc or bonded inner lining, it achieves a bubble-tight, zero-leakage seal against pipeline pressures while maintaining superior mechanical durability.
2. Key Characteristics & Technical Specifications
Ningjin APC Industries manufactures fire protection butterfly valves adhering strictly to international standards. The standardized technical parameters across our primary models (such as GD-381L, GD-381X, WD-371X, and GD-381G) include:
- Maximum Working Pressure: 300 PSI (20.7 Bar)
- Maximum Testing Pressure: 600 PSI (41.4 Bar)
- Working Temperature Range: 0°C to 80°C (32°F to 176°F)
- Pressure Conformance: UL 1091, ULC/ORD-C1091, and FM 1112
- Top Flange Standard: ISO 5211 for seamless actuator and gearbox mounting
3. Body Styles & Material Composition
To accommodate diverse piping layouts, the EPDM Seated Butterfly Valve series is offered in multiple configurations:
- Grooved End Models (e.g., GD-381L, GD-381X, GD-381G): Feature groove standards conforming to ANSI/AWWA C606 or Metric Standard Clear Waterway designs.
- Wafer End Models (e.g., WD-371X, WD-371G/WD-371L): Connection standards comply with ANSI 125/150 and DIN 2501 PN10/16.
Standard Valve Material List:
| Component Description | Material |
|---|---|
| Body | Ductile Iron |
| Disc + Rubber Seat | Ductile Iron + EPDM Encapsulated |
| Upper & Lower Shaft | 416 Stainless Steel |
| Shaft Seal / O-Ring / End Face Seal | EPDM |
| Stem Bushing | PTFE / C95400 |
| Upper & Lower Shaft Sealing Nut | WCB |
4. Applications & Certifications
Designed for versatile reliability, the EPDM Seated Butterfly Valve portfolio is widely deployed in:
- Indoor and outdoor fire protection installations
- Fire inflow water lines and drainage networks
- High-rise building fire fighting systems
- Industrial factory building fire suppression loops
Compliance & Certifications: Depending on the specific model configuration, our valves carry prestigious international approvals including UL, CUL, FM, VdS, CCC, and lead-free certification under NSF/ANSI 61 & NSF/ANSI 372.
5. Installation & Operational Guidelines
Proper installation ensures long-term service life. Always verify that pipeline alignment matches the valve face dimensions. For wafer types, utilize the integrated EPDM end face seal properly against mating flanges without introducing unauthorized gaskets that could distort the rubber seating. Ensure manual levers or signal gearboxes operate smoothly through their full 90-degree range before pressurization.
Frequently Asked Questions (FAQ)
1. What are the operating conditions and application scenarios for Ningjin APC Industries' EPDM Seated butterfly valves?
Ningjin APC Industries' EPDM Seated butterfly valves are engineered for indoor and outdoor use in fire inflow water systems, drain pipes, high-rising building fire fighting systems, and industrial factory building fire protection systems, operating within a temperature range of 0~80°C (32~176°F) and a maximum working pressure of 300 PSI.
2. What certifications have Ningjin APC Industries' EPDM Seated butterfly valves obtained, and can they pass overseas large-scale fire protection project inspections?
These valves hold major international certifications including UL, CUL, FM, VdS, CCC, and lead-free compliance under NSF/ANSI 61 & NSF/ANSI 372, fully satisfying rigorous inspection standards for overseas large-scale fire protection projects.
3. Can Ningjin APC Industries' EPDM Seated butterfly valves serve as reliable alternatives to international top-tier brands?
Yes. Built to conform with UL 1091, ULC/ORD-C1091, and FM 1112 standards with a 600 PSI maximum testing pressure, robust ductile iron bodies, and EPDM encapsulated discs, they offer comparable or superior reliability and compliance as direct alternatives to premium global brands.
Contact Ningjin APC Industries
Company: Ningjin APC Industries Incorporated Company
Address: 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: Ms. Cui
WeChat: cuiyuying01
Tel: +86 18600252968 / +86 534 5571078
Fax: +86-534-5216766
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We uphold a rigorous technical attitude. If you have any questions or find any errors regarding the product technical parameters, standards, or descriptions organized in this article, please submit your feedback through our dedicated channel:
- Technical Error Feedback Email: weidong@apc-valve.com
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