The Model 750-67 Level Control Valve with Modulating Vertical Float is a hydraulically controlled, diaphragm actuated control valve that controls reservoir filling to maintain constant water level, regardless of fluctuating demand. The modified Model 75A-67, installed at reservoir outlet, sustains minimum reservoir level.
The Model 750-67 is a float controlled valve equipped with an adjustable, 2-Way vertical float pilot assembly. The needle valve  continuously allows flow from valve inlet into the upper control chamber . The float  is locked on the float assembly rod  between two adjustable stoppers  and . Should level rise towards setting, the float pilot  throttles, pressure in the upper control chamber accumulates causing the main valve to throttle closed, reducing filling rate, and eventually closing drip tight. Should level fall, the float pilot releases pressure from the upper control chamber causing the main valve to modulate open. The needle valve controls the closing speed. Cock valve  enables manual closing.
Body: Brass or Stainless Steel 316
Elastomers: Synthetic Rubber
Internal parts: Stainless Steel 316 & Brass
Lever system: Brass or Stainless Steel 316
Float rod: Stainless Steel
Base plate: Fusion bonded epoxy coated Steel or Stainless Steel 316
Tubing & Fittings: Stainless Steel 316 or Copper & Brass
Accessories: Stainless Steel 316, Bronze, Brass and Synthetic Rubber Elastomers
Rooftop reservoir level control is attained by electric control of the basement pumps according to reservoir level. As overflow of a rooftop reservoir can cause costly damage, hydraulic backup protection is recommended.
Where system design requires an “always full” rooftop reservoir, the Model 750-67 Modulating
Level Control Valve:
Secured closing, even after long periods of the
valve being open, is ensured by the fully developed hydraulic closing force associated with the double chamber design.
Where well drawdown effects the inflow to a balancing reservoir and outflow varies according to demand, the booster
pump to consumers requires protection against:
The Model 75A-67 responds to the balancing reservoir level and provides this protection by dynamically restricting outflow when inflow to the balancing reservoir drops due to drawdown.
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)