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.
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  connected to a “still point” at the bottom of the reservoir. Should static head rise to pilot setting, the pilot  applies pressure to the upper control chamber  via cock valve , 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  enables manual closing of the main valve.
For 10” valves and larger, an accelerator quickens valve response
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
For lower pressure requirements please contact us
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.
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  continuously allows flow from valve inlet into the upper control chamber . The pilot  senses static head via a sensing tube . 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  enables manual control closing.
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  continuously allows flow from valve inlet into the upper control chamber . The pressure sustaining pilot  and the 2-Way altitude pilot  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  enables manual closing.
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  prevents upstream pressure from entering the pilot  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 , and the check valve  The pilot then opens the main valve allowing reverse flow from the reservoir.
The 3-Way cock valve  enables manual closing of the main valve.
The Model 75A-83 is an altitude pilot controlled valve designed to maintain minimum reservoir volume. The needle valve  continuously allows flow from valve inlet into the upper control chamber . The pilot  senses static head from a “still-point” at the bottom of the
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  enables manual closing.
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.
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  controls the Pressure Sustaining Control Valve by applying pressure to & venting from the pressure sustaining pilot  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  enables manual closing.
The Model 750-86 adds a low level setting feature to the standard Altitude Control Valve. A high level pilot  and a low level pilot  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  enables manual closing of the main valve.
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
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
Please specify the requested valve in the following sequence: (for more options please contact us)