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Products  >  100 Series (GAL)  >  Control Functions  >  100SP Surge Preventing Stepped-Closure Addition  >    

100SP Surge Preventing Stepped-Closure Addition


The device can be added to any control function and automatically adjusts the closing speed of a valve that is located at the end of a long pipeline. This ensures a moderate
flow change pace that prevents pressure surges from evolving. Please consult DOROT for more details
  Can be added to any fast closing control function
Automatically self-adjusted closing pace
Completely hydraulic no electronic controllers, batteries or relays are used
Simple and reliable design

Purchase Specifications
The valve will be hydraulic, direct sealing diaphragm type, which allows inline maintenance. No stem, shaft or guide bearing will be located within the water passage.
The valve will be activated by the line pressure or by an external hydraulic or pneumatic pressure. The valve's
closure pace will be controlled by a stepped closure control pilot that stops the closing procedure whenever surge/waterhammer conditions evolve. The valve and the controls will be a Dorot Series 100 valve or similar in all aspects.
Quick Sizing
  Valve size same as line or one size smaller
  Maximum flow speed for continuous operation 5.5 m/sec (18 ft/sec)

Design Considerations
  The valve should be suited for the maximal flow and allowed headloss
  Prefer selection low pressure diaphragms when the valve is expected to stay in open position for long periods
Should be used whenever the supply pipe is longer than
2 km/ 1.2 mile and the flow speed exceeds 1.5 m/sec



Optional Control System Components:

1.  Main Valve
2. Self-flushing filter
3. Cock valve*
4. Stepped closure adjusting pilot valve
5. 3-way selector valve*

* Optional component


Typical Application

Dorot stepped closure function prevents water-hammer/surges caused by fast closing level control valve.

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