PN16
Product Overview
Spirax Sarco SV615 safety valve is a full-lift, full-nozzle pressure protection device designed for use with steam, air, non-reactive industrial gases and non-hazardous liquids. It fully complies with EN ISO 4126:2004, is certified to the European Pressure Equipment Directive (PED) 97/23/EC, and its seat tightness meets ANSI/API STD 527-1992. The SV615 provides reliable overpressure protection for boilers, pressure vessels, air receivers, air compressors and other pressurised equipment.
The SV615 range offers extensive configuration options, including a wide selection of port sizes, connection types, sealing materials and surface finishes, so that sanitary, appearance and temperature/pressure requirements in different applications can be met. Each valve is supplied as standard with an EN 10204 2.2 test certificate, and an EN 10204 3.1 material certificate is available on request.
Core Parameters
Pressure and Temperature Limits
| Item | Specification |
|---|---|
| Set pressure | Minimum 0.3 bar g; 1/2"–1 1/4" models maximum 18 bar g; 1 1/2"–2" models maximum 14 bar g |
| Overpressure | Steam 5%; gas 10%; liquid 10–25% |
| Maximum allowable backpressure | Steam 5%; gas 10%; liquid 10–25% |
| Blowdown | Steam / gas 10%; liquid 2.5–20% |
| Cold hydraulic test pressure | 37.5 bar g |
| Temperature range | Metal seat: -90℃ to +230℃; Nitrile (NBR) soft seal: -30℃ to +120℃; EPDM soft seal: -50℃ to +150℃; Fluoroelastomer soft seal: -20℃ to +200℃ (Note: soft seals must not be used on steam.) |
Flow and Discharge
| Orifice DN | Flow area (mm²) | Saturated steam discharge (kg/h, 10 bar g) | Air discharge (l/s, 10 bar g) | Water discharge (kg/h, 10 bar g) | Hot water discharge (kW, 10 bar g) |
|---|---|---|---|---|---|
| 15/20 | 113 | 501 | 186 | 9 912 | 231.98 |
| 20/32 | 314 | 1 393 | 517 | 27 544 | 644.63 |
| 25/40 | 452 | 2 005 | 744 | 39 649 | 927.94 |
| 32/50 | 661 | 2 933 | 1 088 | 57 982 | 1 356.96 |
| 40/65 | 1 075 | 4 769 | 1 770 | 94 297 | 2 206.92 |
| 50/80 | 1 662 | 7 374 | 2 736 | 145 788 | 3 411.96 |
Dimensions and Weight
Threaded Connection (BSPF x BSPF or NPTF x NPTF)
| Port size DN | Inlet | Outlet | Dimension A (mm) | Dimension B (mm) | Dimension C (mm) | Flow diameter Ø (mm) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 15 | 1/2" | 3/4" | 40 | 40 | 194 | 12 | 1.3 |
| 20 | 3/4" | 1 1/4" | 55 | 44 | 229 | 20 | 2.4 |
| 25 | 1" | 1 1/2" | 60 | 48 | 242 | 24 | 2.9 |
| 32 | 1 1/4" | 2" | 70 | 58 | 279 | 29 | 4.2 |
| 40 | 1 1/2" | 2 1/2" | 81 | 67 | 365 | 37 | 8.8 |
| 50 | 2" | 3" | 96 | 80 | 420 | 46 | 13.0 |
Sanitary Clamp Connection
| Port size DN | Inlet | Outlet | Dimension A (mm) | Dimension B (mm) | Dimension C (mm) | Flow diameter Ø (mm) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 15 | 1/2" | 3/4" | 40 | 55 | 209 | 12 | 1.4 |
| 20 | 1" | 1 1/4" | 55 | 60 | 245 | 20 | 2.6 |
| 25 | 1" | 1 1/2" | 60 | 64 | 258 | 24 | 3.1 |
Component Material Details
| No. | Component name | Specification / description | Material standard |
|---|---|---|---|
| 1 | Body | General | Bronze (BS EN 1982 CC491KM) |
| 2 | Nozzle | DN15 / DN20 | Stainless steel (BS 970 431 S29) |
| 2 | Nozzle | DN25–DN50 | Stainless steel (BS 3146 Pt2 Gr. ANC2) |
| 2 | Nozzle | Clamp connection | Stainless steel (ASTM A276 316L) |
| 3 | Disc | General | Stainless steel (ASTM A276 316L) |
| 4 | Huddling chamber | General | Bronze (BS EN 1982 CC491KM) |
| 5 | Spring | General | Chrome vanadium alloy steel (BS 2803 735 A50 HS) |
| 6 | Spindle guide | General | Brass (BS 2872 CZ 121) |
| 7 | Spring plate | General | Brass (BS 2872 CZ 121) |
| 8 | Spindle | General | Stainless steel (BS 970 431 S29) |
| 9 | Adjusting screw | General | Brass (BS 2874 CZ 121) |
| 10 | Lever hood | General | Ductile iron (zinc plated) |
| 11 | Pivot pin | General | Stainless steel (AISI 304) |
| 12 | Circlip | General | Stainless steel (BS 2056 316 S42) |
| 13 | Adjusting lever locknut | General | Brass (BS 2872 CZ 121) |
| 14 | Soft seat disc | Nitrile material | Stainless steel / ASTM A276 316 + nitrile |
| 14 | Soft seat disc | EPDM material | Stainless steel / ASTM A276 316 + EPDM |
| 14 | Soft seat disc | Fluoroelastomer material | Stainless steel / ASTM A276 316 + fluoroelastomer |
| 15 | Blind cap | General | Bronze (BS EN 1982 CC491KM) |
| 16 | Cap seal | General | Nitrile rubber |
| 17 | Collar | General | Brass (BS 2874 CZ 121) |
| 18 | Setting screw | General | Steel |
| 19 | Ball | General | Stainless steel |
Installation and Maintenance
Installation Requirements
- During installation, the centre line of the safety valve spring chamber must be vertical and pointing upwards to ensure correct valve operation.
- Select the connection type (threaded or sanitary clamp) according to the actual application. All media-wetted surfaces of clamp-connection valves are polished to a 0.8 μm surface finish.
- Select the sealing material according to the media type. Soft seals (Nitrile, EPDM, Fluoroelastomer) must not be used on steam.
Safety and Maintenance
- For detailed installation, maintenance and safety instructions, refer to the IMP316-03 Installation and Maintenance Guide supplied with the product.
- Check the valve set pressure and sealing performance regularly to ensure they meet the operating requirements of the equipment.
- Unqualified personnel must not dismantle or adjust core valve components, in order to avoid compromising safety performance.
Selection and Ordering
Selection Notes
The product model can be configured using the following codes:
- Configuration: A = Closed bonnet / lever; B = Closed bonnet / blind cap
- Surface finish: P = Electroless nickel plating (ENP); Q = ENP + stainless steel nameplate
- Port sizes: DN15, DN20, DN25, DN32, DN40, DN50
- Connection types: BSPF x BSPF, NPTF x NPTF, Clamp x BSPF
Ordering Example
Spirax Sarco SV615AS DN15 BSP threaded safety valve, set pressure 6 bar g, with electroless nickel plated polished finish (add “P”).
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