What is the difference between SV405, SV615, and SV60 series safety valves?

The SV405 series (brass body) is designed for smaller applications like sterilisers and small compressors up to 20 bar g. The SV615 (bronze body) handles pressures up to 37.5 bar g with sanitary clamp options for hygienic applications. The SV60 series (carbon steel/SG iron) is built for heavy-duty steam boiler and pressure vessel protection up to 60 bar g with flanged connections.

Which safety valve model is suitable for hot water generators?

The SV60H series (SV604H and SV607H) is specifically designed for hot water generators in accordance with DIN 4751, Side 2, for temperatures up to 120°C. These models carry TÜV approval to TRD 421 and TRD 721.

Are Spirax Sarco safety valves approved for use in India?

Yes. All models are CE marked and comply with the European Pressure Equipment Directive 97/23/EC. Select models also carry TÜV and Lloyd's Register approvals, which are widely accepted by Indian Boiler Regulations and factory inspectorates.

What seat tightness standard do these safety valves meet?

All Spirax Sarco safety valves in this range comply with API Standard 527 / ASME API STD 527 for seat tightness, ensuring minimal leakage during normal operation below set pressure.

Can I get stainless steel safety valves for corrosive environments?

Yes. The SV406 features a full stainless steel body (1.4409), while the SV405X has a brass body with a 316 stainless steel nozzle for enhanced corrosion resistance. For high-pressure applications, the SVL606-B offers a stainless steel 1.4408 body rated up to 60 bar g.

SPIRAX SARCO · SAFETY VALVES

Spirax Sarco Safety Valves – SV405, SV615, SV60 Series for Steam & Process Applications

Name: Spirax Sarco Safety Valves – SV405, SV615, SV60 Series for Steam & Process Applications
Brand: Spirax Sarco

Spirax Sarco safety valves for steam boilers, pressure vessels & process equipment. CE marked, TÜV approved. Available at PC Engineering India.

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Overview

Spirax Sarco safety valves are engineered to provide reliable overpressure protection for steam systems, pressure vessels, boilers, and general process equipment. These valves automatically release excess pressure to prevent equipment damage, process interruption, and workplace hazards caused by equipment malfunction, cooling system failure, power outages, or fire conditions.

The range includes compact designs in various body materials—brass, bronze, carbon steel, SG iron, and stainless steel—to suit diverse industrial applications. All models comply with European Pressure Equipment Directive 97/23/EC and meet API 527 seat tightness standards, with select models carrying TÜV approval to AD-Merkblatt, TRD 421, and TRD 721 standards.

Whether protecting small compressors and sterilisers or large steam boilers and hot water generators, Spirax Sarco safety valves deliver dependable performance with minimal maintenance requirements.

Key Features

Compact construction suitable for space-constrained installations
Multiple body materials: brass, bronze, carbon steel, SG iron, stainless steel
CE marked with full compliance to PED 97/23/EC Category 4 for Group 2 gases
Seat tightness compliant with API Standard 527
TÜV approved models available (SV60, SV60H, SVL606 series)
Wide range of connection options: BSP, NPT, PN flanged, ASME flanged, sanitary clamp
Available in sizes from DN15 to DN150 (inlet)
Suitable for steam, air, hot water, and general process fluids

Specifications

Model	Body Material	Max Operating Pressure	Inlet Connection	Outlet Connection	Sizes	Approvals
SV405	Brass CW617N	20 bar g	½" or ¾" BSP/NPT male	¾" BSP/NPT female	½", ¾"	CE, API 527
SV406	Stainless Steel 1.4409	20 bar g	½" or ¾" BSP/NPT male	¾" BSP/NPT female	½", ¾"	CE, API 527
SV405X	Brass with 316SS nozzle	20 bar g	½" or ¾" BSP/NPT male	¾" BSP/NPT female	½", ¾"	CE, API 527
SV405P	Brass CW617N	20 bar g	½" or ¾" BSP male	¾" BSP female	½", ¾"	CE, API 527
SV615	Bronze CC491KM	37.5 bar g	BSP/NPT/Sanitary clamp	BSP/NPT female	DN15–DN50	CE, EN ISO 4126, API 527
SV604	Carbon Steel	60 bar g	PN40 or ASME 300	PN16 or ASME 150	DN20–DN150	CE, TÜV, LR, API 527
SV607	SG Iron	38 bar g	PN16/PN25	PN16	DN20–DN150	CE, API 527
SV604H	Carbon Steel	60 bar g	PN40	PN16	DN20–DN150	CE, TÜV (TRD 421/721)
SVL606-B	Stainless Steel 1.4408	60 bar g	PN40 flanged	PN16 flanged	DN25–DN150	CE, TÜV, Group 1 & 2 fluids

Applications

Spirax Sarco safety valves are deployed across a wide range of industrial sectors and equipment types:

- Steam boilers and hot water generators - Pressure vessels and receivers - Air compressors - Autoclaves and sterilisers - Heat exchangers - Chemical and pharmaceutical plants - Food and beverage processing - Pulp and paper mills - Refineries and petrochemical facilities - Heating and ventilation systems - Downstream of pressure reducing valves

Product Images

Safety Valve Application in Steam System

Frequently Asked Questions

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