Silent Pressure Relief Valve Safety Valve Screwed Stainless Steel
In Stock Silent Operation
Safety & Pressure Relief Valves

Silent Pressure Relief Valve (Safety Valve)
Direct Activated, Screwed, Stainless Steel

Direct activated "Silent" pressure relief valve (safety valve) with CF8/CF8M stainless steel body. Available in screwed and flanged end connections. Sizes from 1/2" to 4". Pressure range 0.5 to 10 kg/cm². Temperature resistance up to 80°C. Suitable for air, water, low temperature oil, and gas applications.

Quick Specifications

Size: 1/2" to 4"
Pressure: 0.5 - 10 kg/cm²
Material: SS CF8 / CF8M
Temperature: Up to 80°C
End Connection: Screwed (BSP/NPT)
Type: Direct Activated, Silent
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Fast Delivery: Ready stock available. Export packing for international shipments.

Product Specifications

TypeDirect Activated, Silent Operation
Size Range1/2" (15mm) to 4" (100mm)
Pressure Range0.5 to 10 kg/cm² (7 to 142 PSI)
TemperatureUp to 80°C (176°F)
Body MaterialStainless Steel CF8 (SS304) / CF8M (SS316)
End ConnectionScrewed (BSP / NPT) - Flanged available on request
MediaAir, Water, Low Temperature Oil, Gas
OperationSpring-loaded, Direct Acting
Set PressureFactory set as per customer requirement

Available Sizes

Size (inch) Size (mm) Thread Pressure Range
1/2"15BSP / NPT0.5 - 10 kg/cm²
3/4"20BSP / NPT0.5 - 10 kg/cm²
1"25BSP / NPT0.5 - 10 kg/cm²
1-1/4"32BSP / NPT0.5 - 10 kg/cm²
1-1/2"40BSP / NPT0.5 - 10 kg/cm²
2"50BSP / NPT0.5 - 10 kg/cm²
2-1/2"65BSP / NPT0.5 - 10 kg/cm²
3"80BSP / NPT0.5 - 10 kg/cm²
4"100BSP / NPT0.5 - 10 kg/cm²

Materials of Construction (MOC)

Component Material Specification
Body & Bonnet Ductile Iron (ASTM A536 / EN-GJS-400-15)
Stem / Spindle SS 410 / SS 420
Seat / Trim EPDM / NBR / Bronze

Technical Specifications

Parameter Specification / Standard
Manufacturing / Design Standard EN 1171 / AWWA C509 / BS 5163
Testing Standard API 598 / EN 12266-1
Pressure Rating PN16 / PN25

Materials of Construction (MOC)

Part Name Material
Body & Bonnet Stainless Steel (ASTM A351 Gr. CF8/CF8M)
Stem / Spindle SS 304 / SS 316
Seat / Trim PTFE / Integral
Gland Packing Graphite / PTFE (Application Dependent)
Handwheel / Actuator Cast Iron / Steel / SG Iron

Frequently Asked Questions

What is a silent pressure relief valve?

A silent pressure relief valve is a direct-acting safety valve designed to release excess pressure quietly without the loud pop or noise associated with conventional relief valves. It provides smooth, gradual pressure relief making it ideal for applications where noise is a concern.

What is the pressure range of this valve?

This silent pressure relief valve operates in the pressure range of 0.5 to 10 kg/cm² (approximately 7 to 142 PSI). The set pressure can be adjusted within this range based on your application requirements.

What media can this valve handle?

This valve is suitable for air, water, low temperature oil, and gas applications. The stainless steel CF8/CF8M construction provides excellent corrosion resistance for these media.

What sizes are available?

The silent pressure relief valve is available in sizes from 1/2 inch (15mm) to 4 inch (100mm) with screwed (threaded) end connections. Flanged versions are also available on request.