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Safety Valves

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Safety Valves

Safety valves are critical protection devices designed to automatically release pressure from a system when it exceeds a preset limit. Their primary function is to prevent equipment damage, rupture, or explosions caused by overpressure conditions in boilers, pressure vessels, and pipelines. By ensuring that pressure remains within safe limits, safety valves help protect both equipment and personnel.

A safety valve operates as the last line of defense in a pressurized system — it must open immediately and reliably when required, and reseat tightly once normal conditions are restored. Because of this, they are built with precision, durability, and absolute reliability in mind.

Exceed Safety Valves are engineered for consistent performance and dependable pressure relief. Each valve is manufactured with high-quality materials, precise spring settings, and tight sealing surfaces to ensure reliable operation across varying pressures and temperatures.

 

Standards:

Flange Dimensions: BS En 1092-1 PN 40 / ASME B16.5 Class 150

Safety valves function automatically based on system pressure acting on a spring-loaded disc:

  1. Normal Operation
    When the system pressure is below the set point, the valve remains tightly closed. The spring force keeps the disc seated, ensuring no leakage during normal operation.

  2. Overpressure Condition
    When pressure rises above the valve’s set pressure, the force on the disc overcomes the spring tension. The disc lifts off its seat, allowing excess fluid (gas, steam, or liquid) to escape rapidly through the outlet.

  3. Pressure Relief and Reseating
    As pressure drops back to a safe level, the spring pushes the disc back into the closed position, reseating the valve. This ensures the system quickly returns to stable operation without unnecessary loss of fluid.

This automatic, self-actuating design makes safety valves a vital part of any pressure system, providing continuous protection without requiring sensors, actuators, or external power.

Safety valves are commonly used:

  • On boilers and pressure vessels – to release steam or gas when pressure exceeds safe limits.

  • In compressed air and gas systems – to protect compressors, receivers, and pipelines.

  • In chemical and process plants – for overpressure protection in reactors and storage tanks.

  • In oil and gas systems – to prevent overpressure incidents in separators and heat exchangers.

  • In water heating systems – to ensure safe operation of hot water lines and equipment.

  • Reliable Pressure Protection
    Safety valves automatically relieve excess pressure to prevent accidents and equipment failure.
    Exceed ensures precise calibration and consistent spring performance for dependable opening and closing.

  • Accurate Set Pressure
    Proper set pressure ensures the valve opens exactly when required.
    Exceed performs rigorous testing and calibration to maintain tight pressure tolerances.

  • Tight Resealing
    Once pressure normalizes, safety valves must reseat perfectly to prevent leakage.
    Exceed machines sealing surfaces to fine tolerances, ensuring bubble-tight reseating and long-term reliability.

  • Durable Construction
    Safety valves must withstand cyclic loading and harsh environments.
    Exceed uses corrosion-resistant materials and robust body designs for long service life under demanding conditions.

  • Low Maintenance and Easy Testing
    A simple spring-loaded mechanism allows easy inspection and testing.
    Exceed designs its valves for straightforward maintenance and reliable repeat performance.

No Part Name Qty Materials
1 Body 1 ASTM A216 Gr. WCB
2 Plate 1 ASTM A36
3 Stem 1 ASTM A276 Type 410
4 Plug 1 ASTM A276 Type 410
5 Seat 1

ASTM A53 with SS410 (13% Cr) Overlay
6 Spring 1 ASTM A229
7 Gland Follower 1 ASTM A216 Gr. WCB
8 Gasket 1 Spiral Wound Gasket with SS304 Winding and Carbon Filler

Spiral Wound Gasket with SS304 Winding and Carbon Filler

Spiral Wound Gasket with SS316 Winding and Carbon Filler
9 Gland Packing Req. Graphite Ring
10 Stud - Nuts Req. MS - MS / ASTM A193 Gt. B7 - ASTM A194 Gr. 2H

The safety valve is adjustable to suit the required system pressure with a set pressure range of 3 to 6 bar.

 

 

 

Size DN F to F ØD ØRF PCD ØM N T
BS EN 1092-1 PN40 ASME B16.5 Class 150 BS EN 1092-1 PN40 ASME B16.5 Class 150 BS EN 1092-1 PN40 ASME B16.5 Class 150
25 160.00 115.00 68.00 85.00 79.20 14.00 16.00 4 4 18.00
40 200.00 150.00 88.00 110.00 98.50 18.00 16.00 4 4 20.00
50 230.00 165.00 102.00 125.00 120.60 18.00 19.00 4 4 20.00
65 290.00 185.00 122.00 145.00 139.70 18.00 19.00 8 4 22.00
80 310.00 200.00 138.00 160.00 152.40 18.00 19.00 8 4 24.00
100 350.00 235.00 162.00 190.00 190.50 22.00 19.00 8 8 26.00
125 400.00 270.00 188.00 220.00 215.90 26.00 22.00 8 8 28.00
150 480.00 300.00 218.00 250.00 241.30 26.00 22.00 8 8 30.00
200 600.00 375.00 285.00 320.00 298.40 30.00 22.00 12 8 34.00

Flange dimensions (PCD, ØM and N) are available as per ASME B16.5 Class 150 or BS EN 1092-1 PN40, as specified by the customer.

(Dimensions above 200mm available on request)

All dimensions are in mm

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