Pump System Control and Water Hammer / Surge Protection
CV Check Valve.
The valve is in "open" position when inlet pressure is higher than outlet pressure. The valve closes, preventing returning flow, on inverted flow direction.
NS Two-Stages, Cushioned Closure Check Valve.
Developed to eliminate pressure slam of check valves, frequently found in roof-tank filling pumps of high-rise buildings. It opens on pump start, and closes at a controlled pace when the pump stops.
BC Pump Control Valve.
Installed on pump discharge. Eliminating pressure surge caused by rapid charge of the pipe velocity. Opens slowly on pump startup, and closes at an adjustable pace before shut-off. The pump motor is then switched-off by an electric interlink with the valve. Optional Pump Control valve applications:
- BC/PS Pump control and Back-pressure sustaining valve.
- BC/CD Pump control valve with extended closure, for long pipelines.
- BC/DI Booster pump control, maintain constant flow at varying suction conditions.
DW Deep Well Control Valve.
Mounted on a tee junction, on the discharge head of deep well, upstream of the check valve. Eliminating pressure surge caused by sudden charge of the pipe velocity through start-up and shut-off.
QR Quick-Relief Safety valve.
Mounted on a tee junction in the pipeline, releasing the water out of the network. When upstream pressure exceeds the safe value the valve opens instantly, releasing the pressure surge.
RE Surge-anticipating valve, Hydraulic Activation.
Mounted on a tee junction, in a discharge pipe of a pumping station. Protecting the pumping and the network system from water hammer, generated by power failure, by releasing the returning wave from the system. The valve is activated by the initial low-pressure wave.
RE/EL Surge-anticipating valve, Electric Activation.
Mounted on a tee junction, in a discharge pipe of a pumping station. Protecting the pumping and the network system from water hammer, generated by power failure, by releasing the returning wave from the system. The valve is activated electrically by the power failure event.
SP Surge-preventing closure.
A unique DOROT control module, that can be added to any automatic valve. It prevents water hammer, that is generated by the valve closure, when it is located at the end of a long pipeline.
For more technical & sizing information and Full Dorot Catalogue, please see below.