Pressure Relief Valves
VRP Range
There are two models of VRP precision relief valve in this range of products:
- VRP-032: Relatively high pressure and lower flow
- VRP-048: Lower pressure and higher flow
Features
- Set point repeatability ±3%
- Sealing re-seat pressure - virtually zero leakage re-seat pressure ≥ 90% of cracking pressure
- Important - set point is affected by vent port back pressure and will DECREASE accordingly
- The main spring load is not transmitted to the seat, thus reducing distortion and wear
VRT Range
The VRT fluid proportional relief valves have been designed primarily to provide overpressure protection in systems subject to fluid thermal expansion, but it can also be reliably used as the primary relief valve in systems with low volume pump flow rates.
Features
- No need to remove from the system for proof testing
- Unique lock down screw facility
- Set point repeatability ±3%
- Set point range - user specified up to 1300 bar
- Sealing re-seat pressure - virtually zero leakage re-seat pressure ≥ 90% of cracking pressure
- Flow capacity - flow rates up to 2 l/min at 10% overpressure
- Back pressure - set point is not affected by vent back pressure. Maximum permissible back pressure is 100 bar
- Operating media - mineral oils, water glycol fluids and some chemicals
- Long life and repeatable performance
VRX Range
The VRX proportional relief valve with integral check valves, have been developed to directly replace a separate check valve and proportional relief valves used, for example, in wellhead control systems.
Features
- No exhaust line connection required - exhaust line piping is eliminated
- Set point repeatability ±3%
- Set point range - user specified up to 1035 bar
- Sealing re-seat pressure – >= 90% (no less than 10% of set pressure)
- Flow capacity - flow rates up to 8 l/min (Relief Valve) and 32 l/min (Integral Check Valve) at 10% overpressure
- Orifice size: 6 mm forward flow, 3.2 mm back flow
- Back pressure - set point is not affected by vent back pressure. Maximum permissible back pressure 100 bar
- Operating media - mineral oils, water glycol fluids and some chemicals. Consult Rotork for specific chemicals and synthetic oils compatibility
- Single integrated unit - single integrated unit eliminates inter-valve piping
- Valve proof testing - removal or disconnection of the valve during proof testing is not required