SERIES 100 EL SOLENOID CONTROLLED VALVE

This valve is activated by the line pressure or by an external hydraulic or pneumatic pressure. Valve position is controlled by a 3-way solenoid valve which activates an electric current or electric pulse to open and close the main valve. The standard valve is supplied in the “normally closed” position with a “normally open” position as optional. This hydraulic valve has direct-sealing diaphragm for inline maintenance. No stem, shaft or guide bearings are located within the water passage. Electric activation can be added to other control applications on request.

Features

• Low power electric activation
• Fast response
• Simple and reliable design

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.
• Select low pressure diaphragms when the valve is expected to stay in the open position for long periods.
• The valve can be opened by the electric command (NC) or closed by it (NO). This definition refers to the main valve operation and not the solenoid’s characteristics.

Series 100 PR Pressure Reducing Valve

This valve is activated by the line pressure or by an external hydraulic or pneumatic pressure. Valve position is controlled by a pressure reducing pilot valve to achieve constant outlet (downstream) pressure, regardless of upstream pressure or flow variations. A 3-way pilot valve allows full opening when upstream pressure drops below the pressure set point.

Features

• Accurate, stable control from no-flow to full flow
• Simple and reliable design
• Exceptionally low losses at high flow
• WRAS Approval no. 04251

Quick Sizing

• Valve size same as line or one size smaller
• Maximum flow speed for continuous operation 5.5m/sec (18 ft/sec)

Design Considerations

• The valve should be suited for the maximal flow and allowed headloss.
• Select 3-way control pilot when the upstream pressure may drop to the required set pressure.
• Large pressure differentials may cause cavitation damage – consult Netafim for solutions if such conditions are expected. This definition refers to the main valve operation and not the solenoid’s characteristics.

Series 100 RE Surge Anticipating Valve

This valve protects the pumping system from water hammer caused by sudden pump shut-off (for example: power failure). Assembled on a T-junction of the main pipeline, this valve instantly opens when the pump stops relieving the returning high pressure wave. The valve slowly closes once the pressure returns to the static level. It can also function as a pressure relief valve. This hydraulic valve has direct-sealing diaphragm for inline maintenance. No stem, shaft or guide bearings are located within the water passage. Line pressure or external hydraulic or pneumatic pressure activates the valve. Two pressure relief pilots – one for opening at a low pressure set point and one for opening at a high pressure set point.

Features

• No slam operation
• Simple and reliable design
• Easy installation and maintenance
• Low resistance and high flow capacity
• Protection for sewage as well as clean water pumping systems

Quick Sizing

• The valve should be sized to match the 80% of the normal flow at static head in the valve site:
  • D[mm] ≤ √(250 x Flow[m3/hr] / √Pressure [mwc])
  • D[inch] ≤ √(0.109 x Flow[gpm] / √Pressure [psi])

Design Considerations

• Install a manual separation/throttling valve, upstream of the valve position.
• Closure time is related to the pipe length and should be extended for longer pipe.
• The valve sensor tube must be connected to the main line.

Series 100 QR Quick Pressure-Relief Valve

This valve opens instantly when the pressure in the pipeline exceeds the safe level, thus relieving excessive pressure from the network. When the pressure returns to normal, the valve closes slowly at an adjustable pace. The valve is hydraulic with a direct sealing diaphragm for inline maintenance. No stem, shaft or guide bearings are located within the water passage. Line pressure or external hydraulic or pneumatic pressure activates the valve.

Features

• No slam operation
• Simple and reliable design
• Easy installation and maintenance
• Low resistance and high flow capacity
• Protection for sewage as well as clean water pumping systems

Quick Sizing

• The valve should be sized to match the expected relief flow at the set opening pressure
  • D[mm] ≤ √(250 x Flow[m3/hr] / √Pressure [mwc])
  • D[inch] ≤ √(0.109 x Flow[gpm] / √Pressure [psi])

Design Considerations

• Install a manual separation valve upstream of the valve.
• Closure time is related to the pipe length and should be extended for longer pipe.
• The valve opens instantly at the set pressure. For regulating the system pressure use a Pressure Sustaining Relief Valve and not a Quick Relief Valve.

D[mm] ≤ √(250 x Flow[m3/hr] / √Pressure [mwc])