Piston-Type Deluge Alarm Valve
The Piston Type Deluge Valve provides rapid and reliable water discharge for deluge fire protection systems. Designed for high-hazard applications, it features a durable epoxy-coated ductile iron body, stainless steel internal components, and optional explosion-proof actuation. Suitable for industrial facilities, substations, tank farms, and aircraft hangars requiring dependable fire protection.
Description
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Products Description
Piston-Type
Deluge Alarm Valve
A pressurized piston-actuated deluge valve engineered for high working pressure and dependable long-term performance - with built-in false-alarm protection, water-hammer resistance, and automatic recirculation.
2.5 MPa
WORKING PRESSURE
10.0 MPa
STRENGTH TEST
DN50–300
SIZE RANGE
Product Overview
Built For Pressure, Tuned For Reliability
The ZSFS pressurized piston-type deluge alarm valve is a wet-pilot-actuated valve used in deluge (open-nozzle) fire protection systems, where an entire pipe network must fill with water quickly and simultaneously once the system is triggered.
The valve normally sits in a closed, standby position: supply-side water pressure is present at the inlet at all times, but a separate pressurized control chamber holds the internal piston firmly against its seat, keeping the system side of the valve dry and isolated. When the detection or deluge control system releases pressure from the control chamber - typically through an electric or pneumatic release path - the piston lifts off its seat and water flows through to the protected system at full bore.
Because the piston is the only major moving part, the valve has a mechanically simple, low-maintenance design. It is built to hold a high working pressure over long service periods, and it includes features intended to reduce nuisance tripping and withstand hydraulic shock from surges or water hammer in the supply line.
How It Works
Standby (closed)
Pressurized water fills the control chamber above the piston, holding it against the valve seat. The inlet side remains pressurized at all times, but flow to the system side is sealed off.
Actuation (open)
When the detection system calls for release, pressure is vented from the control chamber. With the holding pressure removed, supply pressure pushes the piston off its seat and water flows through to the deluge system at full bore.
Reset
Once the control chamber is re-pressurized, the piston returns to its seated position and the valve closes, ready for the next cycle.
Applications
| Warehouses & Storage Areas | Material warehouses, large open storage areas, and tank farms requiring rapid, wide-area fire suppression and cooling. |
| Industrial & Manufacturing Facilities | Production lines, process areas, and high fire-risk industrial facilities requiring fast, simultaneous water discharge. |
| Power & Utility Infrastructure | Substations, transformer yards, and switchgear areas requiring reliable deluge protection for equipment cooling and fire control. |
| Airport & Aviation Facilities | Aircraft hangars, fuel storage, and fueling areas where dependable large-area fire protection is essential. |
Technical Parameters
Piston-Type Deluge Alarm Valve - ZSFS 50–300–2.5J(Ex)
| Specification | Value |
|---|---|
| Available Sizes | DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300 |
| Height (mm) | 270 / 270 / 320 / 320 / 365 / 365 / 480 / 610 / 690 |
| Working Pressure | 2.5 MPa |
| Seal Test Pressure | 5.0 MPa |
| Strength Test Pressure | 10.0 MPa |
Ex-proof electrical option available. Dimensions and ratings subject to confirmation at time of order.
| Component | Specification |
|---|---|
| Valve Body | Ductile Iron / Cast Iron, Epoxy-Coated |
| Internal Trim | Stainless Steel & Bronze |
| Seals | EPDM or Pressure-Rated Synthetic Rubber |
| End Connections | Flanged (Applicable Pipe Standards) |
| Electrical Option | Ex(d) / Ex(i) Explosion-Proof Accessories |
| Mounting | Vertical Inline Installation |
Material and connection details vary by size and order configuration - confirm exact specification with our engineering team before procurement.
Key Features
High working pressure
Rated to hold and operate reliably at 2.5 MPa working pressure, suitable for systems with demanding supply conditions.
Stable, reliable performance
The piston mechanism is designed to maintain consistent response behavior across repeated cycles and long service intervals, reducing the likelihood of drift in trip pressure over time.
Simple operation
A single piston element replaces more complex multi-part clapper or diaphragm assemblies, simplifying both the operating principle and routine servicing.
False-alarm (anti-misfire) protection
The control chamber arrangement is designed to prevent minor, transient pressure fluctuations in the supply line from unintentionally releasing the piston and triggering the system.
Water-hammer resistance
Internal components are designed to absorb hydraulic shock loads from sudden flow changes without damage to the seat or sealing surfaces.
Automatic recirculation (open/close)
The valve cycles open and closed automatically in response to the control system, resetting itself once the control chamber re-pressurizes, without requiring manual intervention between cycles.
FAQ
Q: What is a piston type deluge valve?
A: A piston type deluge valve is a normally closed valve that opens rapidly when activated, allowing water to flow simultaneously through all open nozzles in a deluge fire protection system.
Q: Where are piston type deluge valves used?
A: They are commonly used in power plants, substations, chemical plants, tank farms, aircraft hangars, and other high-hazard industrial facilities.
Q: How is the valve activated?
A: The valve can be actuated by electric, pneumatic, hydraulic, or manual release systems, depending on the system design.
Q: What pipe connections are available?
A: Standard flanged connections are available, with multiple sizes to suit different fire protection piping systems.
Q: Can the valve be supplied with explosion-proof components?
A: Yes. Explosion-proof electrical accessories are available for hazardous locations upon request.
Our address
NO.8, YUANFENG ROAD, MEIYUAN VILLAGE, KANGMEI TOWN, NANAN CITY, QUANZHOU CITY, FUJIAN CHINA
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