Wet Alarm Valve Retard Chamber（RC-1）

The retard chamber for wet alarm valves is a core auxiliary component of the wet alarm valve group in a wet automatic sprinkler system. It is essentially a sealed chamber with buffering and time-delay functions. Its core role is to filter out transient water flows in the pipeline network caused by non-fire factors such as water pressure fluctuations and water filling/air bleeding, preventing false activation of water motor alarms and pressure switches. At the same time, it ensures the timely transmission of alarm signals when a fire occurs, balancing the system's dual requirements of false alarm prevention and rapid response.

● Type：Delayer for wet alarm valve
● Shell Material：Brass alloy / stainless steel
● Static Sealing Pressure：≥1.6MPa
● Core Function：Buffer instantaneous pressure fluctuations, delay alarm signal transmission (filter false alarms), and ensure linkage alarm during real fires
● Design Working Pressure：1.2MPa (typical value)
● Max Pressure Bearing：2.0MPa (static pressure test standard)
● Volume：≥6L (suitable for DN100 wet alarm valve)
● Delay Time：30s±5s
● 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

Enterprise Atlas:

Email:

linhaifeng117@gmail.com

Inquiry Now

Product Details

———

Product Formation

The wet alarm valve delay device is a key accessory of the wet alarm valve in automatic fire sprinkler systems, specifically engineered to resolve false alarms triggered by water pressure fluctuations, system filling, or transient pressure changes. Its development process spans a full-chain workflow—including functional positioning, core component design, material selection, precision manufacturing, performance verification, and compatibility testing—ensuring it works synergistically with the wet alarm valve to deliver three core functions: precise delayed alarming, filtering of transient interference, and stable interlocking with the alarm bell.

Through the systematic engineering of "functional positioning – precision design – strict manufacturing – multi-layered testing," this delay device has evolved into an anti-interference barrier for the wet alarm valve system. It provides a critical guarantee for the reliability and safety of automatic fire sprinkler systems, preventing resource waste and potential safety hazards caused by false alarms.

KEY WORDS： Retard Chamber for Wet Alarm Valve，Delay Device for Water Motor Alarm，Water Pressure Fluctuation Buffer Device，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 .

———

Product Features

As a key accessory of the wet alarm valve in automatic fire sprinkler systems, the wet alarm valve delay device directly addresses the pain point of system false alarms and ensures timely interlock response during fires. Its specific features are as follows:

Precise Delay Control

Via a dual-mechanism of "volume buffering + throttle orifice flow restriction," it delays alarm signals by 30s±5s (meeting industry standards), accurately filtering out transient pressure fluctuations. It only triggers the interlock alarm of the alarm bell and pressure switch when continuous water flow (caused by a fire) passes through the alarm valve.

Strong Anti-Interference Capability

Withstands system operating pressures of 1.2MPa~1.6MPa (instantaneous peak ≤2.0MPa) and remains unresponsive to pressure fluctuations within 0.1MPa~1.6MPa. This prevents false alarms from water hammer effects or routine equipment operation.

Integrated Design

Minimizes dead water zones and impurity deposition, reducing the risk of internal blockages. Reliable sealing ensures stable long-term operation with no performance degradation.

Easy Maintenance Design

Equipped with a brass manual drain valve (threaded connection) at the bottom, it allows periodic discharge of accumulated impurities (e.g., rust, silt) from the delay chamber. Internal flow paths are restored without disassembling the housing.

Durable Materials for Multi-Scenario Adaptability

Made with corrosion-resistant materials, it performs reliably in both conventional indoor environments and harsh settings like coastal areas, high-humidity zones, or chemical industrial parks.

———

Product Parameter

Parameter Item	Value/Description	Basis/Explanation
Type	Delayer for wet alarm valve	Defined by fire protection standards
Core Function	Buffer instantaneous pressure fluctuations, delay alarm signal transmission (filter false alarms), and ensure linkage alarm during real fires	-
Design Working Pressure	1.2MPa (typical value)	System normal working pressure range: 0.14MPa~1.6MPa
Max Pressure Bearing	2.0MPa (static pressure test standard)	2.0MPa (static pressure test standard); Volume: 6L; Wall thickness: Calculated according to maximum system flow rate
Volume	≥6L (suitable for DN100 wet alarm valve)	Redundancy
Delay Time	30s±5s	Industry standard requirements
Connection Method	Inlet: flange/threaded (DN50/DN65); Outlet: threaded (DN25)	Match the interface of wet alarm valve and hydraulic alarm bell
Shell	Shape: cylindrical sealed cavity; Volume: 6L; Wall thickness: >2mm;	Material: Brass Alloy or Stainless Steel; Tensile Strength ≥300MPa
Delayer Cavity	Integrated molding with the shell, smooth inner wall without edges	Volume ratio ≥90%, reduce water flow dead zones
Throttling Hole	Diameter: Φ0.8mm~Φ1.2mm (stainless steel sintered filter / brass drilling)	Flow coefficient μ=0.6~0.8, ensure sufficient back pressure when instantaneous flow is 50L/min
Inlet	Flanged connection (DN65) / threaded connection (DN50), with flow guide vanes	Flow guide vane angle: 15°~20°, reduce water flow impact vibration
Outlet	Threaded connection (DN25), built-in silicone duckbill check valve	Check valve opening pressure ≤0.02MPa, prevent water backflow
Drain Valve	Brass material, threaded connection to the bottom of the shell	Opening torque ≤5N·m, discharge flow rate ≥1L/min
Sealing Component	Shell end cover: nitrile rubber O-ring (Shore hardness 70±5HA); Throttling hole: PTFE sealing gasket	Sealing Pressure at Room Temperature ≥1.6MPa, Temperature Resistance: -10℃ to 80℃
Pressure Fluctuation Resistance	Input pressure 0.1MPa~1.6MPa, fluctuation rate 0.1MPa/s, no leakage/mis-triggering in 1000 consecutive tests	Pressure fluctuation test bench, monitor outlet pressure stability
Static Sealing Pressure	≥1.6MPa (no leakage when holding pressure for 30s)	Sealing performance test (close drain valve, pressurize to 1.6MPa)
Shell Material	Brass alloy / stainless steel	Brass: tensile strength ≥300MPa; Stainless steel: hardness HV≥200
Throttling Hole Filter Element Material	Stainless steel sintered filter element (porosity 30%~40%)	Corrosion resistance: no rust after salt spray test ≥96h
Sealing O-Ring Material	Nitrile rubber (NBR)	Oil resistance: ASTM D471 test, volume expansion rate ≤15%
Check Valve Material	Silicone (Shore hardness 50±5HA)	Aging resistance: no cracking after 70℃×96h, elastic recovery rate ≥90%

———

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!

——

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！