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Waterworks

Bermad Model 750-80 - Level Control Valve

The Model 750-80-X Level Control Valve is a hydraulically controlled, diaphragm actuated control valve that shuts off at pre-set reservoir high level and fully opens in response to an approximately one meter (three foot) level drop, as sensed by the 3-Way altitude pilot mounted on the main valve.

PRODUCT CODE:
750-80-XXX
SIZE RANGE:
40-1200mm

Features and Benefits

  • Line pressure driven – Independent operation
  • Bi-level altitude pilot
    - No float, simple installation
    - On/Off service
    - No cavitation damage
    - Suitable for low quality water
    - Reservoir inherent refreshing
  • Double chamber design
    - Moderated valve reaction
    - Protected diaphragm

  • External installation
    - Easy access to valve
    - Easy level setting
    - Less wear and tear
  • Balanced seal disk – High flow capacity
  • In-line serviceable – Easy maintenance
  • Flexible design – Easy addition of features

Major Additional Features

  • Modulating altitude control – 750-82
  • Pressure sustaining (for 750-80-X) – 753-80-X
  • Pressure sustaining (for 750-82) – 753-82
  • Bi-directional flow – 750-87-X (780-70-X)
  • Full powered opening & closing – 750-80-B
  • Closing surge prevention – 750-80-49
  • Bi-level altitude control – 750-86
  • Level sustaining with high sensitivity pilot – 75A-83

Operation

The Model 750-80-X is a pilot controlled valve equipped with an adjustable, 3-Way altitude pilot. The pilot senses the static head of the reservoir level via a tube [1] connected to a “still point” at the bottom of the reservoir. Should static head rise to pilot setting, the pilot [2] applies pressure to the upper control chamber [3] via cock valve [4], powering the main valve to shut off.

Should static head fall below pilot setting approximately 1m (3 ft), the pilot vents the upper control chamber, causing the main valve to fully open.

The 3-Way cock valve [4] enables manual closing of the main valve.

For 10” valves and larger, an accelerator quickens valve response

Bermad Model 750 - 80 - Level Control Valve - Operation

Pilot System Specifications

Standard Materials:

Pilot:

Body & Cover: Brass or Stainless Steel

Elastomers: Synthetic Rubber

Spring: Galvanized Steel or Stainless Steel

Internal parts: Stainless Steel

Diaphragm Covers: Fusion bonded epoxy coated Steel or Stainless Steel

Tubing & Fittings: Stainless Steel 316 or Copper & Brass Open

Accessories: Stainless Steel 316, Brass and Synthetic Rumersbber Elasto

Altitude Adjustment Range:

Notes:

  • Shut-off level repeatability: 10 cm (4”)
  • Re-opening level: approx. 1m (3 ft) below shut-off level
  • 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

“Always Full” - Shallow Reservoirs

In these reservoirs, the water level should be kept as constant as possible. The Level Control Valve with modulating altitude pilot Model 750-82 is well suited to fulfill this condition. The altitude pilot is highly sensitive to changes and accurately maintains level within a few centimeters. To do so, the sensing tube end must be connected to a “still point” at the bottom of the reservoir.

Level Control Valve with Modulating Altitude Pilot Model 750-82

The Model 750-82 modifies the Model 750-80-X “on-off” feature into a modulating feature to maintain an “always full” reservoir. The needle valve [1] continuously allows flow from valve inlet into the upper control chamber [2]. The pilot [3] senses static head via a sensing tube [4]. Should the static head rise towards pilot setting, the pilot throttles, causing the main valve to throttle closed, reducing filling rate, and eventually closing drip tight. The downstream cock valve [5] enables manual control closing.

Adding the Pressure Sustaining Feature Model 753-82

The Model 753-82 combines the modulating altitude control feature with the Model 730 Pressure Sustaining Valve for applications where prioritizing consumers over reservoir filling is needed. The restriction [1] continuously allows flow from valve inlet into the upper control chamber [2]. The pressure sustaining pilot [3] and the 2-Way altitude pilot [4] control outflow from the upper contro chamber. When reservoir static head decreases below altitude pilot setting, the main valve modulates open while sustaining pre-set minimum upstream pressure. The downstream cock valve [5] enables manual closing.

Bi-Directional Flow Level Control Model 750-87-X

The Model 750-87-X modifies the Model 750-80-X to allow bi-directional flow. It saves the need for a line sized, During filling, this valve functions as a standard Model 750-80-X, while the control check valve [1] prevents upstream pressure from entering the pilot [2] sensing chamber.

Should upstream pressure fall below reservoir static head, the pilot senses “false” low static head, due to the restricted flow released to valve inlet, through the needle valve [3], and the check valve [1] The pilot then opens the main valve allowing reverse flow from the reservoir.

The 3-Way cock valve [4] enables manual closing of the main valve.

Level Sustaining Valve at Reservoir Outlet Model 75A-83

The Model 75A-83 is an altitude pilot controlled valve designed to maintain minimum reservoir volume. The needle valve [1] continuously allows flow from valve inlet into the upper control chamber [2]. The pilot [3] senses static head from a “still-point” at the bottom of the

resrvoir.

Should this head decrease towards pilot setting, the pilot throttles, enabling pressure to accumulate in the upper control chamber causing the main valve to throttle closed and restrict outflow, and eventually close to maintain minimum level.

When reservoir level rises above pilot setting, the pilot releases accumulated pressure from the upper control chamber causing the main valve to modulate open. To ensure adequate operating pressure, the valve must be positioned sufficiently below the reservoir bottom. The downstream cock valve [4] enables manual closing.

Typical applications

Bi-Level Water Towers

The Model 750-80-X senses the static head of the water level in the tank by means of a high sensitivity pilot. To do so accurately, the sensing tube end must be connected to a “still point” at the bottom of the tank. The drainage pipe provides this “still point,” a location not influenced by flow velocity as in filling and outflow pipes.

Level Control and Pressure Sustaining Valve with Altitude Pilot Model 753-80-X

The Model 753-80-X adds the altitude control feature to the Model 730 Pressure Sustaining Valve for applications where prioritizing consumers over reservoir filling is needed. The altitude pilot [1] controls the Pressure Sustaining Control Valve by applying pressure to & venting from the pressure sustaining pilot [2] sealed spring cell. Should the altitude pilot sense static head at the setting, it applies pressure to the pressure sustaining pilot spring cell, and the main valve closes. The downstream cock valve [3] enables manual closing.

Level Control Valve with Bi-Level Altitude Control Model 750-86

The Model 750-86 adds a low level setting feature to the standard Altitude Control Valve. A high level pilot [1] and a low level pilot [2] are adjusted to open at different settings. Should the static head rise to the closing set point, the high level pilot opens causing the main valve to close. Should the static head drop to the opening set point, the low level pilot opens causing the main valve to open. When the level is between pilot settings, both pilots are closed and the main valve remains in its last position. The 3-Way cock valve [3] enables manual closing of the main valve.

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

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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Product code

Bermad Model 750-80 - Level Control Valve

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