The Zurn Wilkins Model ZW204 Non-Modulating Float Operated Control Valve is designed to be either fully open or fully closed in response to the position of the float. The valve will accurately control the fluid level of a tank, opening at a preset low point and closing at a preset high point. The Float Pilot Valve will be set up for remote liquid level control as standard. The Float Pilot can be mounted to the control valve at additional cost.

ZW204 utilizes a float pilot that opens the valve fully at a predetermined low set point and closes it tightly at the high set point. This pilot consists of a body, rotary disc and the float. The body of the pilot contains three sets of flow passages: the supply, the common and the exhaust. The rotary disc is correspondingly keyed to these same functions of supply, common and exhaust. The pilot is so constructed that when the float reaches its low level set point, the supply port of the pilot is blocked, and the common port connects to the exhaust. This vents pressure in the upper chamber of the main valve thereby allowing inlet pressure to open the valve and fill the tank. As the float reaches its high level set point, the opposite action takes place with the exhaust port blocked and supply connected to the common port. This pressurizes the upper diaphragm chamber of the main valve and the valve closes. To facilitate smooth, free movement of the rotary pilot’s float and mechanical linkage, the weight of the float arm is counterbalanced on a pivot. Properly adjusted, this counterweight allows the float to effortlessly move the float arm (thus the rotary pilot) through the full range between the low and high level set points. Establishing these set points is a simple matter of appropriately positioning the float with upper and lower stop collars on the float rod.

PRODUCT FEATURES

• Main body made from Ductile iron.
• Stainless steel stem, spring, seat and disc guide.
• FDA Approved Fusion Epoxy coating internally and externally for corrosion protection.
• Working temperature range 1°C to 60°C.
• Sizes available: 32mm - 400mm (1-1/4" - 16").
• Pilot rating 300psi (2100kPa).
• Monel Float: 6" diameter Stainless Steel Float.
• Rod: Two 12" sections of Stainless Steel rod (additional 12" SS extensions available, up to 5' max rod length). Additional counterweight necessary with additional extensions.
• On/Off Set Point Adjustment.