Level Control Valves

Fire protection level control valves are used on fire water storage tanks, reservoirs, and feed tanks serving sprinkler or hydrant networks where automatic level maintenance is required without continuous manual intervention. Valve selection should be based on tank geometry, available inlet pressure, allowable level differential, overflow arrangement, isolation requirements, and whether the application requires one-way or non-one-way flow.

This category includes the Cla-Val 124-01 and Cla-Val 210-01 / 610-01. The 124-01 is a non-modulating float valve for tank level control. It opens fully when the liquid level reaches a preset low point and closes drip-tight when the preset high point is reached. This operating principle is suited to filling duty with defined start and stop levels rather than continuous proportional flow regulation.

The Cla-Val 210-01 / 610-01 are altitude valves for one-way flow and high-level shutoff without a float mechanism. The valve remains fully open until the shutoff elevation is reached and is hydraulically controlled through a pilot that balances spring force against the static head of the tank via a sensing line. The high-level setpoint is adjusted by changing the pilot spring compression.

Available configurations in this category include ANSI standard construction, flanged ends, pressure classes 150 lb and 300 lb, and body materials such as brass, ASTM A216 WCB carbon steel, and ductile iron. Material selection should be checked against water quality, corrosion potential, installation environment, and the required pressure-temperature envelope of the system.

Maintenance should include inspection of pilot tubing, sensing line, strainers, diaphragm, seat, float assembly where fitted, level setpoint, and shutoff tightness. In fire water tanks, incorrect adjustment or blockage in the control circuit can result in overflow, insufficient stored water volume, or delayed refill following a flow test or system demand event.