The Fire Pump Suction Control Valve shall be a single seated, line pressure operated, diaphragm actuated, pilot controlled globe or angle valve. The valve shall seal by means of a corrosion-resistant seat and resilient, rectangular seat disc. These and other parts shall be replaceable in the field; all such service and adjustments to be possible without removing the valve from the line. The stem of the basic valve shall be guided top and bottom by integral bushings. The basic valve and its pilot control system shall contain no packing glands or stuffing boxes. The diaphragm shall not be used as a seating surface nor shall pistons be used as an operating medium. All internal and external ferrous surfaces shall be coated with a high quality, fusion epoxy coating. The pilot control system shall include a direct-acting, normally closed, spring-loaded, diaphragm actu- ated pilot valve with the stem guided between the diaphragm assembly and seat disc. To ensure precise suction pressure control the appropriately rated pilot valve shall be field adjustable within the pressure control range of the spring. The Fire Pump Suction Control Valve shall be a ZURN WILKINS Model ZW215FP
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