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Waterworks

Bermad Model 718-3 - Electric Control Valve

The Model 718-03 Electronic Control Valve combines the advantages of an excellent modulating, line pressure-driven, hydraulic control valve with the advantages of electronic control. This valve responds to signals from the electronic controller BERMAD BE (optional), by changing its opening position according to the set values programmed into the controller.

PRODUCT CODE:
718-03-XXX
SIZE RANGE:
40-1200mm

Features and Benefits

  • Line pressure driven – Independent operation
  • Solenoid controlled
    - Low power consumption
    - Wide ranges of pressures and voltages
    - Normally Open, Normally Closed or Last Position
  • Electronic Controller compatible
    - Local & remote modification of set values
    - Suitable for conventional PLC methods
    - Data logging
  • In-line serviceable – Easy maintenance
  • Double chamber
    - Full powered opening (option “B”) and closing
    - Non-slam closing characteristic
    - Protected diaphragm
  • Semi-straight flow – Smooth flow characteristics

  • Stainless Steel raised seat – Cavitation damage resistant
  • V-Port Throttling Plug – Low flow stability
  • Flexible design – Easy addition of features

Major Additional Features

  • Full powered opening & closing – 718-03-B
  • Downstream over pressure guard – 718-03-48
  • Relief override – 718-03-3Q
  • Check feature – 718-03-20
  • Flow-over-the-seat (fail-safe close) – 718-03-O

Operation

Bermad Model 718-03 - Electric Control Valve - Operation

The Model 718-03 is a Electronic Control Valve equipped with two 2-Way solenoid pilots.The interaction between the two solenoids determines the required opening position as signaled by the dedicated electronic controller (optional BERMAD BE) [1]. The upstream solenoid [2] applies pressure to the upper control chamber [3] harnessing valve differential pressure to power the diaphragm actuator to a more closed position. The downstream solenoid [4] vents upper control chamber pressure resulting in a more open main valve. Needle valves [5] & [6] control the closing and opening speed of the valve. Valve position can be provided by either an optional limit switch, or an analog transducer.In cases where pipeline water is contaminated (corrosive, debris laden) external control fluid is often used.Normally closed, normally open and last position models are available.

For very low pressure applications, refer to the full powered opening and closing Model 718-03-B.

Pilot System Specifications

718-03 control loop consists of two solenoids:

Standard Materials:

Solenoids:

Body: Brass or Stainless Steel

Elastomers: NBR or FPM

Enclosure: Molded epoxy

Tubing & Fittings: Stainless Steel 316 or Copper & Brass

Accessories: Stainless Steel 316, Brass and Synthetic Rubber Elastomers

Solenoids Electrical Data:

Voltages:

(ac): 24, 110-120, 220-240, (50-60Hz)

(dc): 12, 24, 110, 220

Power Consumption:

(ac): 30 VA, inrush; 15 VA (8W), holding or 70 VA, inrush; 40 VA (17.1W), holding (dc): 8-11.6W

Values might vary according to specific solenoid model

Notes:

  • Inlet pressure, outlet pressure and flow rate are required for optimal sizing and cavitation analysis
  • Recommended continuous flow velocity: 0.3-6.0 m/sec ; 1-20 ft/sec
  • Minimum operating pressure: 0.7 bar ; 10 psi.

For lower pressure requirements please contact us.

Electronic Control of a Single Variable

This method is suited for those applications where dynamic control of a variable is required. The system includes a Model The controller receives continuous inputs from the analog transducer and corrects the valve opening in response to a comparison with the programmable set value. The set value can be changed either manually on the controller keyboard or remotely through PC, SMS or any other communication methods.

This system can be used for a wide range of applications including:

  • Pressure control (see below)
  • Flow control
  • Level control
  • Pressure Reducing

Pressure Reducing

Installing the pressure transducer downstream from the valve provides a pressure reducing feature.

Either of two methods can be applied:

  • Local pressure control as transmitted by pressure transducer A.
  • Remote pressure control as transmitted by critical point pressure transducer B.

Pressure Sustaining

Installing the pressure transducer upstream from the valve provides a pressure sustaining feature:

  • Sustaining pump discharge pressure
  • Sustaining circulated discharge pressure
  • Sustaining pump suction pressure
  • Sustaining reservoir or canal level

Electronic Control of Mixing Junctions

This method is suited for dynamic control of two parallel valves controlling the two separate sources of a mixing junction. These systems include two Model 718-03 Electronic Control Valves, and a dedicated electronic controller (optional BERMAD BE). Two types of systems are used.

Type A - Sampling the Mixture

The controller receives continuous inputs from the analog transducer (conductivity, salinity, temperature etc.), and corrects, in real-time, the opening of each valve in comparison with the programmed value.

Type B - Sampling the Sources

The controller receives continuous inputs from both flow transducers and corrects, in real-time, the opening of each valve, thus maintaining constant flow ratio between the two sources to achieve the desired result.

  • Combination of both Types A and B is available also

Electronic Control of a Variable as a Function of Another Variable

This control method is suitable for those applications that require dynamic control of a dependant variable as a programmable function of a governing variable. The system includes a Model 718-03 Electronic Control Valve, a dedicated electronic controller (optional BERMAD BE), and two transducers (one for each variable). The controller receives continuous inputs from both transducers and corrects the valve opening in response to a comparison with the set value according to a programmed function.

This system can be used for a wide range of applications including:

  • Leakage control – Pressure control as a function of flow (see below)
  • Reservoir applications – Inlet or outlet flow control as a function of reservoir level
  • Heating and cooling systems – Flow control as a function of temperature or ΔP

Leakage Control

Optimum network design requires active adjustment of the system set pressure to the minimum possible level

Common PRV

Common PRVs are set to keep the downstream pressure constant, ensuring sufficient pressure at the system critical point during “peak” demand (when line friction head loss is highest). The shaded area represents the hours and levels when pressure is higher than required.

Active PRV

The Model 718-03 and controller continuously corrects the PRV’s set value to ensure the minimum required pressure at the system critical point. As a result, the average network pressure dramatically decreases, reducing system leakage flow, burst, maintenance, energy and chemical costs. The shaded area represents the hours and levels when leakage is reduced.

Leakage Control Installation

Data logging and analysis of the distribution network parameter values enable establishing a function for real time adjustment of pressure according to system demand. The flow and pressure transducers continuously transmit to the controller which reacts by adjusting the Model 718-03 according to the pre-established function.

Technical Data

Size Range: DN40-900 ; 11/2–36”

End Connections (Pressure Ratings):

Flanged: ISO PN16, PN25 (ANSI Class 150, 300)

Threaded: BSP or NPT

Others: Available on request

Valve Patterns: “Y” (globe) & angle, globe (DN600-900 ; 24”-36”)

Working Temperature: Water up to 80°C ; 180°F

Standard Materials:

Body & Actuator: Ductile Iron

Internals: Stainless Steel, Bronze & coated Steel

Diaphragm: Synthetic Rubber Nylon fabric-reinforced

Seals: Synthetic Rubber

Coating: Fusion Bonded Epoxy, RAL 5005 (Blue) approved for drinking water or Electrostatic Polyester Powder

Differential Pressure Calculation

Flow Data & Dimensions Table

How to Order

Please specify the requested valve in the following sequence: (for more options please contact us)

  • Size
  • Main model
  • Additional features
  • Pattern
  • Body material
  • End connection
  • Coating
  • Voltage & main valve position
  • Tubing & Fittings materials
  • Operational data (according to model)
  • Pressure data
  • Flow data
  • Reservoir level data
  • Settings

Manual
Datasheet
Engineering Data*
* Note: For some products Manual or Engineering Data are available only upon request.

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For more information or different sizing please contact us.

Product code

Bermad Model 718-3 - Electric Control Valve

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