Editorial Technical Reference

Safety Valve

This page explains how Safety Valve is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A pressure relief device designed to automatically release excess pressure from a gas cylinder or generator to prevent catastrophic failure.

Product Specifications

Technical details and manufacturing context for Safety Valve

Definition
A safety valve is a critical component used in gas cylinders and generators to protect against overpressure conditions. It automatically opens when the internal pressure exceeds a predetermined set point, allowing a controlled release of gas to prevent explosions or equipment damage. Once the pressure drops to a safe level, the valve reseals automatically. This valve operates on a spring-loaded mechanism: a calibrated spring holds a valve disc against a seat. When system pressure exceeds the spring force, the valve opens; when pressure falls below the set point, the spring closes it. The valve is available in stainless steel or brass, with a nominal diameter range of 15–100 mm and a set pressure range of 0.1–42 MPa (ISO 4126-1). It is designed for operating temperatures from -40°C to 450°C (ISO 4126-1) and offers a flow capacity (Cv) of 0.5–120 (ISO 4126-1). The leakage rate at 90% set pressure is ≤0.05 ml/min (ISO 5208), and the response time is ≤0.5 seconds (ISO 4126-1). The material grade for wetted parts is stainless steel 316L (ASTM A351). Weight ranges from 2.5 to 35 kg, depending on size and pressure rating. Connection type is flanged, with pressure ratings of DIN PN16–PN40 (DIN EN 1092-1). The seat tightness class meets ISO 5208 Class VI, and repeatability is ±1% (ISO 4126-1). These specifications serve as reference ranges; actual values must be confirmed with the manufacturer for the specific model and application. Always verify compliance with relevant standards and regulations before installation.
Working Principle
The safety valve operates on a spring-loaded mechanism. A calibrated spring exerts force on a valve disc, holding it against a seat. When the system pressure exceeds the spring force, the disc lifts, allowing gas to escape through the valve outlet. This release reduces the pressure. Once the pressure drops below the set point, the spring force overcomes the pressure, pushing the disc back onto the seat, resealing the valve. The set pressure is adjustable via the spring compression. The valve is designed to open fully within 0.5 seconds of pressure exceedance, ensuring rapid pressure relief.
Common Materials
Stainless Steel, Brass
Technical Parameters
ParameterTypical rangeNotes & selection driver
Nominal Diameter15–100 mmStandard flange sizes for piping integration.ISO 5208
Set Pressure0.1–42 MPaPressure at which the valve opens.ISO 4126-1
Operating Temperature-40–450 °CTemperature range for continuous service.ISO 4126-1
Flow Capacity (Cv)0.5–120 CvDetermines relief capacity at set pressure.ISO 4126-1
Leakage Rate≤0.05 ml/minMaximum allowable seat leakage at 90% set pressure.ISO 5208
Response Time≤0.5 sTime from pressure exceedance to full opening.ISO 4126-1
Material Grade316L ASTMCorrosion-resistant stainless steel for wetted parts.ASTM A351
Weight2.5–35 kgDepends on size and pressure rating.
Connection TypeFlanged DIN PN16–PN40Flange rating matches system pressure.DIN EN 1092-1
Pressure RatingPN16–PN40 barMaximum allowable working pressure at 20°C.DIN EN 1092-1
Seat Tightness ClassClass VI ISO 5208Meets stringent leakage requirements for gas service.ISO 5208
Repeatability±1 %Consistency of set pressure across cycles.ISO 4126-1

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Valve Body
    Main housing containing all internal components
    Material: Stainless Steel
  • Spring Part
    Provides calibrated force to keep valve closed until set pressure is reached
    Material: Spring Steel
  • Valve Disc Part
    Sealing surface that opens to release pressure
    Material: Stainless Steel
  • Adjustment Screw Part
    Allows calibration of set pressure
    Material: Brass
  • Valve Seat
    The face the disc is held against; it is what actually holds pressure until the set point.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Set pressure range: 1 to 300 bar
flow rate: Based on orifice size (e.g., D to T orifice per API 526)
temperature: -20°C to 150°C
slurry concentration: Not applicable for gas cylinders/generators; suitable for clean gases only
Media Compatibility
✓ Natural gas ✓ Compressed air ✓ Nitrogen
Unsuitable: Corrosive or particulate-laden gases (e.g., chlorine, unscrubbed biogas)
Sizing Data Required
  • Required set pressure (bar)
  • Required relieving capacity (kg/h or Nm³/h)
  • Gas properties (molecular weight, specific heat ratio)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Sticking or binding
Cause: Corrosion buildup, fouling from process media, or lack of lubrication on moving parts preventing proper opening/closing.
Leakage (failure to seat properly)
Cause: Worn or damaged seating surfaces from erosion, corrosion, or foreign particle damage, or thermal distortion from over-temperature conditions.
Maintenance Indicators
  • Visible leakage or weeping from the valve discharge when the system is at normal operating pressure (indicating it's not sealing properly).
  • Audible continuous or intermittent hissing or chattering noise from the valve during normal operation (suggests partial lift, instability, or internal damage).
Engineering Tips
  • Implement a regular testing and inspection schedule per ASME or manufacturer guidelines, including bench testing to verify set pressure and seat tightness, and internal inspection for corrosion, wear, or deposits.
  • Ensure proper installation with adequate drainage to prevent accumulation of moisture or debris, and use inlet/outlet isolation valves that allow for safe testing and maintenance without system shutdown.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 4126-1: Safety devices for protection against excessive pressure - Safety valves ASME/ANSI B16.34: Valves - Flanged, Threaded, and Welding End DIN EN ISO 4126-1: Sicherheitseinrichtungen gegen unzulässigen Überdruck - Sicherheitsventile

Quoted from the published standard.

Manufacturing Precision
  • Seat Bore Diameter: +/-0.02mm
  • Lift Height: +/-0.1mm
Quality Inspection
  • Hydrostatic Shell Test
  • Set Pressure and Blowdown Test

Manufacturers of Safety Valve

12 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Bluesky
Wenzhou, Zhejiang, CN
Managed by the manufacturer
Listed on the company's own website
Listed there as: “CNG Dispenser Safety Valve”
View source page ↗ blueskynewenergy.com · checked 2026-09-02
China Sanitary Valve
Zhejiang, CN
Founded 200251~100 staff5,000-10,000 square meters
ISO9001 ASME CE Test Report
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Sanitary Safety Valves”
View source page ↗ chinasanitaryvalve.com · checked 2026-08-22
CJan Fluid Technology Co., Ltd.
Shanghai, CN
ISO 9001:2015 IATF 16949
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Sanitary Safety Valves”
View source page ↗ cjanfluid.com · checked 2026-08-22
Dongying Lake Petroleum Technology CO., Ltd
Shandong, CN
ISO GOST
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Safety Valve”
View source page ↗ lakepetro.com · checked 2026-08-22
Jianen Sanitary
Wenzhou, Zhejiang, CN
Founded 2009
3A CE ISO9001 SGS
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Sanitary Safety Valves”
View source page ↗ jianen-sanitary.com · checked 2026-08-22
Landee Industries
Xiamen, Fujian, CN
Founded 1994230+ staff
ASME U-Stamp
Also makes: Butterfly Valve, Heat Exchanger, Valve Actuator and 8 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Safety Valves”
View source page ↗ landee.cn · checked 2026-08-22
Sunthai Extractor
Zhejiang, CN
200-500 staff20,000 m²
ISO 9001:2015
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Sanitary Safety Valve”
View source page ↗ sunthaiextractor.com · checked 2026-08-22
Zhejiang Sanhe Spring Co., Ltd. (SANHE / SIPLEE)
Wenzhou, Zhejiang, CN
Founded 200380+ staff5000 square meters
ISO9001 ISO14001
Listed on the company's own website · profile compiled by CNFX from public sources
View source page ↗ siplee-spring.com · checked 2026-08-18
Neway Valve (Suzhou) Co., Ltd.
Suzhou, Jiangsu, CN
Also makes: Power Plant, Transmission Lines, Control Valve and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
View source page ↗ newayvalve.com · checked 2026-08-18
ANWVF
Wenzhou, Zhejiang, CN
Also makes: Gate Valve, Check Valve, Diaphragm Valve and 5 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Safety Valve”
View source page ↗ wvf-valve.com · checked 2026-09-16
AVM Extraordinary Intelligent Control (Zhejiang) Co., Ltd.
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Sanitary Safety Valve”
View source page ↗ avmfluid.com · checked 2026-08-27
CHINA YOY VALVE GROUP
Wenzhou, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “PRESSURE SAFETY VALVE”
View source page ↗ yoyvalves.com · checked 2026-09-08
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Frequently Asked Questions

What is the set pressure range for this safety valve?

The set pressure range is 0.1–42 MPa, per ISO 4126-1. However, the exact set pressure for your application must be confirmed with the manufacturer, as it depends on the system design and safety requirements.

What materials are available for the safety valve?

The valve is available in stainless steel or brass. For wetted parts, the material grade is stainless steel 316L (ASTM A351). Confirm the material compatibility with your process media and operating conditions.

What is the leakage rate at 90% of set pressure?

The maximum allowable seat leakage at 90% set pressure is ≤0.05 ml/min, per ISO 5208. This ensures minimal leakage during normal operation. Verify the actual leakage performance with the manufacturer for your specific model.

What standards does this safety valve comply with?

The valve references ISO 4126-1 for set pressure, flow capacity, response time, and repeatability; ISO 5208 for leakage rate and seat tightness class; and DIN EN 1092-1 for connection type and pressure rating. Compliance must be verified with the manufacturer for the specific model.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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