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walton ENGINEERING CO. LTD.
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In operation and before the refrigerant gas has reached its working temperature, the valve will re-circulate the full volume of sea water back to the pump suction. As the water temperature increases and the gas pressure rises into the control range, the gas load acting on the bellows will overcome the initial spring load and move the control rod which will turn the valve rotor through the ball and sleeve connection, opening the flow to overboard and reducing the amount of water being re-circulated. A further rise in gas pressure will increase the overboard flow and reduce the re-circulation until at some gas pressure within the overall control range, an equilibrium condition will be obtained with constant gas pressure and overboard discharge volume. Any change of load on the machinery or sea water temperature will be compensated for by an adjustment in the volume discharged overboard, maintaining the gas pressure - and hence the air-conditioned areas - within the desired control range.
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Supplier of Temperature Control Valves and Optical ProjectorsCopyright © 2005 Walton Engineering Co. Ltd. |