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Leslie Controls, Inc., part of the Thermal Fluid Division of Circor International Inc., is a manufacturer of industrial water heaters, control systems and regulators headquartered in Tampa, Florida. It is one of two major manufacturers of train horns in North America, the other being Nathan Manufacturing, Inc. [ 1 ]
Pressure regulator for domestic water supply. Outlet pressure is set with the blue handwheel and shown on the vertical scale. A water pressure regulating valve limits inflow by dynamically changing the valve opening so that when less pressure is on the outside, the valve opens up fully, and too much pressure on the outside causes the valve to shut.
The valve must always be installed vertically, usually at the top of a short vertical pipe. If the valve body is filled with water, the float moves upwards and closes the valve. If air collects in the valve body, the waterline lowers, as does the float, and the valve opens to release it. [4]
When air is present, the float drops, allowing the valve to open and bleed air out. When water reaches (fills) the valve, the float lifts, blocking the water from escaping. Small (domestic) versions of these valves in older systems are sometimes fitted with a Schrader-type air valve fitting, and any trapped, now-compressed air can be bled from ...
Pressure independent control valves are used to limit the flow to the fan coil terminal and air handling unit. This flow is not affected by changes in inlet pressure. A diaphragm within the valve keeps the outlet pressure constant, and this delivers a constant flow to the terminal. The added advantage of pressure independent control valves is ...
"Air or control signal failure to open" – On failure of compressed air to actuator, the valve opens under spring pressure or by backup power. The modes of failure operation are requirements of the failure to safety process control specification of the plant. In the case of cooling water it may be to fail open, and the case of delivering a ...
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