Devices to protect refrigeration systems from excess pressure.
DUAL SAFETY VALVE COMBINATIONS
Devices to protect refrigeration systems and their components from excess pressure. The arrangement comprises of one 3-way valve and two safety valves dependent or independent on back pressure.
Safety Valve Combinations type WVR-SVA & WVR-SVU
WVR-SVU, WVR-SVA Dual Safety Valves and WVR SVA / SVU Dual Safety Valves with Chain Drive
GEA dual safety relief valves are designed for installation in the refrigerant cycles of industrial refrigeration systems. The safety valves which are dependent of back pressure protect refrigeration systems and their components from excess pressure (see also EN 378 part 2). They comply with the technical regulations of the German Technical Control Board (TÜV) and with AD2000 regulations. Once the set response pressure is reached GEA safety valves begin to open. They open within a 10 % pressure increase until the designed limit of the lift is reached. When the pressure drops again they start closing once the set response pressure is reached. They close completely within a pressure drop of 10 % below the set response pressure. The 3-way valve enables easy checks and maintenances of the safety valves without the system’s operation to be interrupted. One of the two outlet nozzles is always open whereas the other one is closed. So one safety valve can be inspected or even disassembled while the other one remains in service to protect the system.
WVR AL SVA / SVU Dual Safety Valves
They are available with safety valves either back pressure dependent or independent to protect the refrigeration systems and their components from excess pressure (see also EN 378 part 2). They comply with AD2000 regulations. After their initial response GEA safety valves open within 10 % of pressure increase up to the designed limitation. They close within a pressure drop of 10 % below the response pressure. The 3-way valve enables easy checks and maintenances of the safety valves without the system’s operation to be interrupted. One of the two outlet nozzles is always open whereas the other one is closed. So one safety valve can be checked or removed while the other one remains in service to protect the system. The compact design of the WVR AL requires minimum space and enables horizontal and vertical assembly. Compared to steel and stainless steel valve types the weight could be reduced by up to 30 % by using salt-water resistant aluminum EN AW-6082 as body material.
Technical Features
- 3-way valves are made of aluminum, safety valves are available in steel or stainless steel
- Selection of body material as per German DIN EN12284, AD2000 Series W
- Working mediums: refrigerants as per EN 378 p. 1, e.g. NH3, R134a, R290 (propane), R507 and blends with refrigerator oil; neutral, gaseous and liquid mediums; glycol-based cold brine
- Installation position: vertical as per AD2000-leaflet A2 and horizontal
- Available valve seat seals (for safety valves):
- WVR-SVUA / WVR-SVAA / WVR AL-SVAA / WVR AL-SVUA : PTFE seal, can be used at temperatures of -60 °C to +180 °C, cannot be used for response pressures of less than 10 bar.
- WVR-SVUB / WVR-SVAB / WVR AL-SVAB / WVR AL-SVUB: elastomer seal, can be used at temperatures of -50 °C to +110 °C
| WVR-SVA Dual
Safety Valves | WVR-SVU Dual
Safety Relief Valves | WVR AL SVA / SVU Dual
Safety Valves | WVR SVA / SVU Dual
Safety Valves with Chain Drive | |
| material | steel or stainless steel | steel or stainless steel | aluminum (3-way valve) steel
or stainless steel (safety valves) | steel or stainless steel |
| nominal size (inlet\outlet) | DN 15/15 – 65/100 | DN 15/15 – 65/100 | DN 15-32 | DN 15-100 |
| nominal pressure level | PS 25, PS 40, PS 63 | PS 25, PS 40, PS 63 | PS 25, PS 40, PS 63 | PS 25, PS 40, PS 63 |
| temperature range for
standard valves | WVR-SVAA: -60 °C to +180 °C
WVR-SVAB: -50 °C to +110 °C | WVR-SVUA: -60 °C to +180 °C
WVR-SVUB: -50 °C to +110 °C | WVR AL-SVAA / SVUA: -60 °C to +180 °C
WVR AL-SVAB / SVUB: -50 °C to +110 °C | WVR SVAA / SVUA: -60 °C to +180 °C
WVR SVAB / SVUB: -50 °C to +110 °C |
| connection | flanged ends as per DIN and ANSI
threaded ends | flanged ends as per DIN and ANSI
threaded ends | flanged ends as per DIN and ANSI
| flanged ends as per DIN and ANSI
|
| additional information | available with bursting discs,
bursting disc holder and excess flow valve | available with bursting discs,
bursting disc holder and excess flow valve | available with bursting discs,
bursting disc holder and excess flow valve | available with bursting discs,
bursting disc holder and excess flow valve |
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