Diaphragm-type Deluge Alarm Valve（SV-1）

The diaphragm-type deluge alarm valve is a critical control valve in automatic sprinkler systems, specifically engineered for large-space, high-risk scenarios. It achieves rapid opening/closing via the "diaphragm pressure sensing" principle, integrating three core functions: efficient water control, precise alarm triggering, and reliable system interlocking.
As a foundational component for fire safety in large buildings and industrial facilities, it delivers second-level response (≤2 seconds) thanks to its minimalist design—ideal for applications requiring large-area, rapid water suppression (e.g., petrochemical workshops, warehouses, stadiums). It also balances long-term operational stability with low maintenance costs, making it irreplaceable in both industrial and civil fire protection projects. Ultimately, it acts as an "invisible line of defense" safeguarding lives and property.

● Diaphragm Material：EPDM / NBR / FKM
● Valve Body Material：Ductile iron (QT450 - 10, surface epoxy resin coating) / Carbon steel (WCB, internal & external anti - corrosion treatment) / 304 stainless steel
● Valve Seat Material ：Bronze (CuSn8) / Stainless steel (316L)
● Nominal Diameter (DN)：Sizes: DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300 (larger sizes customizable)
● Working Pressure Range：0.14MPa–1.6MPa (design pressure: typically 1.2MPa–1.6MPa)
● Design Pressure：1.2MPa / 1.6MPa (high - pressure types: up to 2.5MPa)
● Operating Temperature：-40℃ ~ +80℃
● OEM Service：Accepted
● Delivery Terms：FOB, CFR, CIF, EXW
● Payment Mode：T/T, L/C, PayPal, Western Union

Product category:

UL/FM Fire Sprinkler

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Product Details

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Product Formation

A diaphragm-type deluge alarm valve is a critical control valve widely used in automatic sprinkler systems, primarily designed for scenarios requiring rapid and extensive water spraying in large spaces and high-risk areas. Its core design is based on the "diaphragm pressure sensing" principle, enabling rapid opening and closing of the valve through pressure differences between its upper and lower chambers. It combines efficient water control, precise alarm triggering, and reliable interlocking capabilities, serving as a core component in ensuring fire safety for large buildings and industrial facilities. Additionally, its simple structure and convenient maintenance have solidified its irreplaceable position in both industrial and civil fire protection projects.

KEY WORDS： Diaphragm-type Deluge Alarm Valve，Diaphragm-type Deluge Valve，Deluge Alarm Valve Diaphragm Component ，Diaphragm-type Deluge Valve Valve Body，Quick-opening Deluge Alarm Valve，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

It uses a high-performance elastic diaphragm to divide the valve chamber into an "upper control chamber" and a "lower water flow chamber," enabling accurate response to pressure fluctuations in the control pipeline and rapid switching of the valve state.
The diaphragm structure eliminates friction and wear from mechanical transmission parts in traditional valves, reducing failure points and enhancing operational reliability.
The valve achieves full opening in ≤2 seconds, making it ideal for high-risk scenarios (e.g., petrochemical workshops, warehouses, stadiums) requiring "second-level response."
The diaphragm’s reverse sealing design prevents water backflow into the control chamber, avoiding accidental valve closure or damage.
It supports multiple activation modes—electric (solenoid valve), manual (quick-opening valve emergency operation), and mechanical emergency (manual pump pressure relief)—adapting to diverse fire scene requirements.
The valve body is constructed from ductile iron (epoxy resin-coated) or stainless steel, with control pipeline accessories in brass alloy or stainless steel, resisting impurities and corrosion in fire water to extend service life.
Key components are individually replaceable without full valve disassembly, ensuring convenient maintenance and reducing operational costs.

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Product Parameter

Parameter Item	Typical Value/Range	Description
Diaphragm Material	EPDM / NBR / FKM	EPDM: Aging resistance & good water resistance (general purpose);
		NBR: Chemical corrosion resistance (suitable for chemical environments);
		FKM: Chemical corrosion resistance (suitable for chemical environments)
Valve Body Material	Ductile iron (QT450 - 10, surface epoxy resin coating) / Carbon steel (WCB, internal & external anti - corrosion treatment) / 304 stainless steel	Ductile iron balances strength and cost; stainless steel suits corrosive environments (e.g., coastal areas, chemical plants).
Valve Seat Material	Bronze (CuSn8) / Stainless steel (316L)	Bronze: Wear - resistant & excellent sealing;
Valve Seat Material	Bronze (CuSn8) / Stainless steel (316L)	Stainless steel: Corrosion - resistant & extends service life.
Control Chamber Volume	5L–20L (designed per diameter & pressure)	Volume impacts pressure response speed; small - volume chambers respond faster (e.g., DN150’s control chamber ≈ 8L).
Stabilization Device	Automatic water - dropping valve (stainless steel) + air - replenishing valve (brass/stainless steel)	—
Nominal Diameter (DN)	Sizes: DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300 (larger sizes customizable)	Determines flow capacity; matches protection area (e.g., DN150 covers ~500–800㎡).
Working Pressure Range	0.14MPa–1.6MPa (design pressure: typically 1.2MPa–1.6MPa)	Normal operating pressure range for system/supply sides; must match fire pump head & pipe network static pressure.
Design Pressure	1.2MPa / 1.6MPa (high - pressure types: up to 2.5MPa)	Max. long - term working pressure; dictates body wall thickness & material strength.
Test Pressure	Hydrostatic test: 1.5× design pressure (no leakage for 1min); Burst pressure: ≥2.4× design pressure	Complies with GB 5135.7; verifies pressure resistance of body & seals.
Main Inlet & Outlet Connection	Flange connection (GB/T 17241.6 - 2010 / ANSI B16.5 Class150)	Match the flange of the fire protection pipe network; the sealing gasket is nitrile rubber or metal spiral wound gasket.
Control Pipeline Interface	Solenoid valve interface: Rc1/2″ (DN15) / Rc3/4″ (DN20); Manual valve interface: Rc1/2″	Solenoid valve (DC24V) controls pressure relief of the control chamber; Manual valve (brass/stainless steel) for emergency operation.
Alarm Device Interface	Hydraulic alarm interface: Rc2″; Pressure switch interface: G1/2″ (threaded connection)	Hydraulic alarm outputs acoustic alarm (≥70dB@1m); Pressure switch outputs electrical signal (DC24V/2A).
Operating Temperature	-40℃ ~ +80℃	EPDM diaphragm is suitable for a wide temperature range; cold - resistant rubber shall be selected for low - temperature environments (e.g., outdoor in northern regions).
Applicable Medium	Clear water (impurity particle size ≤0.2mm, pH value 6.5–8.5)	Impurities must be filtered to prevent clogging of diaphragm gaps or valve seat flow channels.
Storage Environment	Temperature: -20℃ ~ +50℃, Relative humidity ≤90% (no condensation)	For long - term storage, keep it dry and well - ventilated; avoid direct sunlight to prevent rubber aging.
Notes	Specific details need to be confirmed with the supplier.

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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！