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Pneumatic Safety Relief Valves (SRV)

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Introduction: Pressure Control in System Piping and Vessels

Pneumatic Safety Relief Valves (SRVs) are essential safety devices designed to automatically relieve excessive pressure from a system (such as air tanks, closed-loop water systems, or high-pressure gas lines) to prevent catastrophic failure, rupture, or equipment damage. In fire protection, they are critical for maintaining supervisory air pressure and for high-pressure clean agent cylinder integrity.

These valves are set to "pop" open when the internal pressure exceeds a predetermined set point, instantly venting the excess pressure until the system pressure drops to a safe level, at which point the valve reseats. SRVs are characterized by their set pressure, blowdown (the difference between set and reseat pressure), and flow capacity (CFM or L/min).

For fire applications, they are used to protect air compressors used for dry pipe/pre-action systems (NFPA 13), protect water lines from thermal expansion, and ensure the safety of high-pressure clean agent cylinders (NFPA 2001). All valves must be UL listed or ASME certified to ensure accurate pressure relief. (Approx. 540 words)

Advantage: ASME Certified Accuracy, Safety, and Reliability

  • Catastrophic Failure Prevention: Guarantees that internal system pressure will not exceed the design limits of the piping, tanks, or vessels.
  • Precise Set Point: Valves are factory-tested and sealed to ensure they open precisely at the designated pressure, meeting strict ASME or UL standards.
  • Corrosion Resistance: Stainless steel options (316) are available for protection in chemical environments or high-humidity areas.
  • NFPA Compliance: Essential for meeting the overpressure protection requirements of NFPA 13 (sprinklers) and NFPA 2001 (clean agents).
  • Automatic Reset: The spring-loaded design ensures the valve automatically closes (reseats) after relieving the pressure, minimizing agent/air loss.
  • Tamper Proof: Valves are typically supplied with a lock wire or seal to prevent unauthorized alteration of the factory-set pressure.

Specification: Set Pressure, Blowdown, and Flow

Valve TypeSpring-Loaded Safety Relief Valve (SRV)
ActuationAutomatic, Spring-Activated Pressure Release
Set Pressure Range10 psi to 6000 psi (Dependent on Application)
Blowdown (Reseat)2% to 7% Below Set Pressure (Typical)
Flow CapacityRated in SCFM or L/min (Dependent on Orifice Size)
Connection Size1/4 inch to 2 inch NPT/BSP
Standard ComplianceASME Boiler and Pressure Vessel Code, UL Listed, NFPA 13/2001
MaterialBrass, Bronze, or Stainless Steel (316)

Overpressure Protection for System Integrity

Dry Pipe / Pre-Action Air Compressors

Installed on the air supply line or receiver tank to ensure the compressor does not exceed the maximum allowable supervisory air pressure in the sprinkler system (NFPA 13).

Clean Agent Cylinder Safety

Integrated into the cylinder valve assembly to relieve pressure if the cylinder is exposed to fire/extreme heat, preventing tank rupture (NFPA 2001).

Closed-Loop Water Systems

Installed on the discharge of the fire pump or closed water loop to relieve pressure caused by thermal expansion or sudden pump surges.

Fire Pump Casing Relief

Small relief valves used to prevent overheating and overpressure within the fire pump casing during "churn" (no flow) conditions.

High-Pressure Gas Storage

Used on storage tanks for inert gas agents (e.g., Nitrogen, Argon) to prevent overpressure due to temperature changes.

Grow Your Bussiness With KAITUO

  • INNOVATION

    Professional R&D Team

    We have a professional R&D team of over 15 people who are able to provide innovative products and customized design services to our customers.

  • QUALITY

    Product quality assurance

    We adhere to quality as a lifeline for our business development, and strict quality management systems ISO and CE, as well as a variety of advanced quality testing equipment are our guarantees for product quality.

  • PRODUCTION CAPACITY

    Annual output exceeds 400,000

    Every month over 400,000 pcs of kinds of valves, including fire extinguisher valve, lpg valve, marine gas cylinder valve and so on.

  • SERVICE

    One-stop service

    We have complete design, and product development, testing and quality control are all carried out in the factory, which to a certain extent guarantees the high quality and performance of Kaituo fire equipment.

Payment & Shipping: Flexible Global Trade Solutions

We offer comprehensive and secure international trade terms tailored to our global clientele.

  • Accepted Payment Methods:

    Wire Transfer (T/T): Standard 30% deposit to confirm the order, 70% balance upon presentation of Bill of Lading (B/L) copy.

    Letter of Credit (L/C): Irrevocable L/C at sight for pressure vessel component orders, providing maximum financial security for both parties.

  • Shipping Terms (Incoterms):

    FOB (Free On Board): Ningbo Port is our standard shipping hub.

    CIF/CFR: Available upon request; we manage shipping logistics to your designated port.

  • Packaging:

    Valves are individually boxed, with thread protectors and internal cushioning, then consolidated into secure wooden crates.

Comprehensive Information Summary

Minimum Order Quantity (MOQ)5,000 Units (Brass), 1,000 Units (Stainless Steel)
Lead Time60-75 Days (Casting, Precision Machining, Calibration, and Sealing)
PackagingIndividual Boxes, Thread Protectors, Master Crates.
CertificationsASME/NB Certified, UL Listed, NFPA 13/2001 (Compliance), ISO 9001.
Raw MaterialsBrass/Bronze/Stainless Steel Body, Steel Spring, PTFE/Viton Seals.
Customization OptionsFixed Set Pressure, Orifice Size (Flow Capacity), Connection Type (NPT/BSP/Flanged), Material, Manual Lift Lever Inclusion.

Professional Usage Tips

  1. Installation Orientation:

    Install the SRV in the upright vertical position as specified by the manufacturer to ensure proper drain and operation of the spring mechanism.

  2. Downstream Piping:

    The discharge piping (venting) from the relief valve must be designed to safely discharge the fluid/gas away from personnel and equipment, following code requirements.

  3. Set Pressure Selection:

    The valve's set pressure must be less than the maximum allowable working pressure (MAWP) of the weakest component in the system it is protecting.

  4. Calibration:

    SRVs must be re-certified or replaced every 5 years (or as required by local code) to ensure the set pressure remains accurate and the valve seats correctly.

  5. Lock Wire Integrity:

    Visually inspect the manufacturer's lock wire/seal to ensure the set pressure has not been tampered with or adjusted in the field.

Get in Touch

ABOUT KAITUO
Ningbo Kaituo Valve Co., Ltd., also known as Ningbo Anke Fire Equipment Co., Ltd., is China Pneumatic Safety Relief Valves (SRV) Manufacturers and Wholesale Pneumatic Safety Relief Valves (SRV) Factory, specializing in the research and development, production and export of fire equipment. It owns the anke brand and a number of national high-tech patents.
Founded in 2001, our company mainly provides high-quality fire protection products for the international market, specializing in the production of various types of fire extinguisher accessories, marine gas cylinder valves, gas valves, etc. After years of hard work and continuous improvement of process reform, our products are exported to dozens of countries around the world and have won a good international reputation. All of our products have obtained the EU EN, CE certification in 2007.
Welcome all customers to call and visit us. Our company has a professional sales team to provide accurate services.
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FAQ

A Relief Valve opens gradually proportional to the pressure increase. A Safety Valve (SRV) opens with a sudden, full pop when the set pressure is reached.

Blowdown is the pressure difference between the point at which the valve opens (set pressure) and the point at which it closes (reseats).

Yes, every pressure vessel (including compressor receiver tanks) and the discharge line must have an approved pressure relief device per ASME and NFPA 13.

SRVs are typically tested and/or replaced every 5 years, but local codes or the manufacturer's instructions may require more frequent testing.

No. SRVs must be factory set and sealed. Field adjustment usually voids the ASME certification and is considered illegal in most jurisdictions.

Standard steel sprinkler piping usually has a maximum working pressure of 175 psi or 300 psi. The SRV should be set below this limit.

When water in a closed system is heated (e.g., by ambient temperature increase or adjacent hot equipment), its volume expands, causing the pressure to rise rapidly.

The Minimum Order Quantity (MOQ) for bulk 1/2 inch brass SRVs is typically 5,000 units.

The bonnet encloses the spring mechanism. Some bonnets include a lift lever for manual testing.

Yes. If the valve seat is worn or dirty, it may not close properly, leading to a condition called "weeping" or "chattering," causing continuous pressure loss.