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To achieve rapid closure followed by slow shut off on turbine nozzle pipelines. This minimizes pressure surges (i.e. water hammer) and prevents pelton wheel turbines from over speeding in the event of electrical load loss.
To destroy pressure energy in fluids so that the energy can be reduced by a finite desired amount.
To remove particles and foreign matter from the water flow supplied to all areas of an underground mine.
To divert the flow of backfill material from one point of placement to another. Furthermore, to ensure that the placed backfill material is not diluted or washed away by the flush water, the valve can be switched to divert flushing water away from the placement point at the end of a backfill placement cycle.
The Water Level Control Valve, is used to control the level of water in underground dams. The valve is typically coupled to a Manual Isolation Valve and an Energy Dissipator to form a system which will maintain dam water levels.
The high pressure Excess flow valve is designed to shut off in the event of an excess flow condition resulting from a pipe burst or in circumstances where maximum flow rates need to be controlled. This must be done without causing a pressure surge (water hammer) in the process. The trip mode is in 2 stages – initially very rapid to prevent runaway flow, then slowly to give a soft shut off. The trip flow is normally set at 35% above the working flow rate.
Pressure Ratio Valves accurately maintain a set ratio between upstream and downstream pressures. Pressure Regulating Valves accurately maintain a constant preset downstream pressure, regardless of changing upstream pressures or flow rates, with controlled response designed to ensure stability and minimal line surging when the downstream flow changes rapidly.
The Surge Anticipation Valve (SAV) is designed to prevent pressure surges above the steady state pumping pressure in the event of a pump trip out, entirely by mechanical means, thus eliminating the need for electrical systems that require a battery UPS back-up.
To allow air to be admitted into the pipe (pump out column) if a sub atmospheric condition (vacuum) develops due to a pump trip out.
To minimize pipeline pulses (water hammer), generated by a pump trip out, by closing rapidly in the reverse flow direction. It is mainly used with Pump Control Valves in mine dewatering applications.
To open rapidly when the pressure in a pipeline reaches a pre-set limit, thereby eliminating excessive pressure surges or over pressurization.
Pump Control Valves protect pumps and pipelines against any damage that may result from start / stop or flow surging caused by an electrical trip out by minimizing the pressure surges (water hammer) by slowly increasing or decreasing the velocity of the water. An Electric Actuator provides precise PLC control over the valve position.
Pump Control Valves protect pumps and pipelines against any damage that may result from start / stop or flow surging caused by an electrical trip out by minimizing the pressure surges (water hammer) by slowly increasing or decreasing the velocity of the water.
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