Deluge valve diaphragm（DV-5）

The diaphragm of a deluge valve is not only the core sealing and control component of the deluge valve but also a vital element that directly affects the overall performance of the fire protection system. Serving as a critical link between the valve's control mechanism and water flow regulation, it plays an irreplaceable role in maintaining the valve's normal operation. Its main function is to achieve the precise opening and closing of the valve by adapting its shape in response to pressure changes within the valve's control chamber—when the system is in a standby state, it remains stable to keep the valve closed, and when a fire occurs, it deforms promptly to trigger the valve's opening. Beyond just enabling the valve's operation, it also ensures that the fire protection system can spray water in a timely, efficient, and reliable manner to extinguish fires in case of a fire; this reliability is vital for minimizing fire spread, reducing potential damage, and ultimately protecting lives and property in fire-prone areas, as it delivers a rapid water discharge exactly when it is needed most.

● Body Materials：EPDM /NBR/FKM/other
● Burst Pressure：≥3.0MPa (2.5 times working pressure)
● Leakage Rate：≤5mL/h when soaked in water for 24h at 1.6MPa pressure
● Action delay：Trigger time ≤50ms at pressure rise rate of 0.05MPa/s
● Fatigue Life：No leakage or deformation after 1 million pressure cycles (0~1.6MPa)
● OEM Service：Accepted
● Delivery Terms：FOB, CFR, CIF, EXW
● Payment Mode：T/T, L/C, PayPal, Western Union

Product category:

UL/FM Alarm Check Valve

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Product Details

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Product Formation

The deluge valve diaphragm is a core sealing and pressure sensing component of the deluge valve in automatic fire sprinkler systems. By isolating the valve body’s pressure chamber from the water chamber, it senses system pressure changes and triggers valve opening—serving as the critical "pressure switch" ensuring the deluge valve’s rapid response to fires. Its formation process integrates functional positioning, structural design, material selection, precision manufacturing, and comprehensive performance verification, guaranteeing long-term stable operation even in harsh fire protection scenarios and providing core support for system reliability.

Through the systematic engineering of "precise structural design – high-performance materials – full-process precision manufacturing – multi-dimensional performance verification," the deluge valve diaphragm evolves into the deluge valve’s "pressure nerve." Its core advantages lie in rapid response, long-lasting sealing, and strong environmental adaptability, ensuring the deluge valve opens promptly during fires to release fire-extinguishing water flow. This secures critical time for personnel evacuation and initial fire control, making it a core guarantee for the reliability of automatic fire sprinkler systems.

KEY WORDS： Deluge valve membrane，Sprinkler system diaphragm，Fire protection diaphragm，EPDM deluge valve diaphragm，EPDM deluge valve diaphragm，China, manufacturers, suppliers, wholesale, factory.

Other Classifed Products：

Fire Hose Categories, Fire Sprinkler System, Fire Protection Valve , Fire Hose Reel&Cabinet , Fire Foam Equipment，Fire Nozzle and Fire Monitor , Fire Hydrant , UL/FM Fire Fighting Equipment , Brass Valve Categories , Fire Extinguisher Series .

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Product Features

As a core control component of fire deluge systems, the performance of deluge valve diaphragms directly impacts system reliability and response speed. Below are its key features:

High-Strength Elastic Materials

Diaphragms are typically made of fiber-reinforced rubber or nylon-reinforced rubber. Some high-end products use multi-layer co-vulcanization processes, embedding metal mesh or fabric layers into the rubber matrix to enhance puncture resistance and mechanical strength.

Integrated Molded Structure

Advanced designs employ fully supported balanced diaphragm assemblies that integrate elastic diaphragms with hardened valve discs. Zero leakage is achieved via radial sealing technology. For example, the diaphragm assembly in Bermad’s FP 400E series uses a peripheral support mechanism to prevent tensile deformation, while reducing moving parts to improve stability.

Corrosion-Resistant Surface Treatment

For harsh environments, the diaphragm surface can be coated with fused epoxy, which resists UV radiation and salt spray corrosion—ideal for outdoor or coastal applications.

Rapid Response & Precise Control

The diaphragm is driven by the pressure difference between the control chamber and water supply chamber. When the control chamber is depressurized (e.g., a fire detector triggers a solenoid valve), the diaphragm rebounds quickly to achieve millisecond-level opening, ensuring the system releases water to suppress fires in seconds.

Wide Operating Temperature Range

Standard rubber diaphragms work in 4℃~70℃ environments. Special designs with heat tracing tape maintain elasticity at -30℃, preventing hardening failure—suitable for cold northern regions or cold storage facilities.

Online Maintenance & Easy Replacement

Modular design allows the diaphragm assembly to be replaced without dismantling the entire valve, minimizing downtime for repairs.

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Product Parameter

Parameter	Value/Description
Type	Fire sprinkler valve sealing and pressure sensing assembly
Applicable System	Automatic sprinkler system (deluge system)
Core Functions	Pressure sensing, rapid actuation, long-term sealing
Body Materials	- EPDM (Ethylene Propylene Diene Monomer):
	Tensile strength ≥15MPa, elongation at break ≥400%
	- NBR (Nitrile Butadiene Rubber):
	Excellent oil resistance (volume swelling ≤10% per ASTM D471)
	- FKM (Fluoroelastomer):
	High-temperature resistance (200℃ long-term use), corrosion resistance
	- Composite Material:
	Rubber matrix + metal mesh/aramid fiber reinforcement (puncture resistance ≥100N)
Burst Pressure	≥3.0MPa (2.5 times working pressure)
Leakage Rate	≤5mL/h when soaked in water for 24h at 1.6MPa pressure
Action delay	Trigger time ≤50ms at pressure rise rate of 0.05MPa/s
Fatigue Life	No leakage or deformation after 1 million pressure cycles (0~1.6MPa)
Temperature Resistance Performance	-40℃~70℃ (Standard Type);
Temperature Resistance Performance	-55℃~85℃ (Wide-Temperature Type)
Temperature	-40℃~70℃ (Standard);
Temperature	-55℃~85℃ (Wide-Temperature Type)
Humidity	≤95%RH (No Condensation)

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FAQ

Q: Can you accept sample order?

A: Yes, we accept samples with little and reasonable charge.But need customer pay sample fees and transport fees first.

Q: What is your payment terms?
A: Payment supports T/T, L/C, etc.

Q: How can l get my order?
A: We will send you the goods by UPS,DHL,FedEx,Oversea Shipment or other forwarder, all with tracking number.

Q: Why choose us?
A： With over 15 years of experience in the fire protection industry, our company has professional technical personnel and many well-known partners in the domestic market. We offer favorable prices and guarantee quality, having passed multiple certifications!

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With more than 15 years of experience serving clients, we have developed extensive expertise and in-depth industry knowledge, enabling us to deliver reliable and effective solutions tailored to your requirements.
We provide professional technical support and customized service offerings. Our committed technical team is available to assist you with product consultation, installation guidance, and comprehensive after-sales support whenever necessary.
At Sheng Feng Fire, our professionals are dedicated to helping you select the most suitable products based on your specific needs.
Please do not hesitate to contact us for further information！