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Products  >  100 Series (GAL)  >  Control Functions  >  100TO Two Stage Opening Addition  >    

100TO Two Stage Opening Addition


The device can be added to any control function and will prevent damage caused by too fast filling of a drained pipeline. The flow rate will be restricted, until the network,
downstream of the valve is full and than a full opening of the valve is enabled. Please consult DOROT for more details.
  Can be added to any pipe-filling control function
User adjusted filling 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
opening will be restricted by a two-stage opening control that limits the filling flow until the downstream system is full. 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



Optional Control System Components:

1.  Main Valve
2. Self-flushing filter
3. Cock valve*
4. Pilot Valve
5. 3-way selector valve*

* Optional component


Typical Application

Dorot two-stage function prevents water-hammer/surges caused by fast drained pipe filling.

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