Wolseley

PENN Controls Products Catalog

Issue link: https://boomart.uberflip.com/i/1442607

Contents of this Issue

Navigation

Page 243 of 367

V46 Series Valve Sizing Information—90% Open Method To Select Water Valve Size See the Flow Chart for selection of water valves. Carefully follow the steps as outlined below. 1. Determine maximum water flow required. The manufacturer of the condensing unit will usually provide tables, or calculations can be made from the following: a. Maximum Btu per hour to be removed. (Be sure to add heat gains in refrigeration equipment and heat of compression. If figures are not available, it is customary to add 25% to the load for these heat gains.) b. Incoming water temperature at time of maximum load. c. Outlet water temperature; this must be lower than condensing temperature of the refrigerant - use condensing unit manufacturer's data, or assume 10° difference. d. Flow (gallons/min) = 2. Draw horizontal line across upper half of flow chart through flow required as determined by Step 1d above. 3. Determine the available system pressure for use with the valve by the following appropriate method: - Open System: Available System Pressure = Inlet Pressure - condenser pressure drop - friction losses in piping. - Closed System: Available System Pressure = Inlet Pressure - static head - condenser pressure drop - friction losses in piping. The available system pressure is represented by the curve in the lower half of the flow chart. 4. Draw a horizontal line from 55 psi head pressure rise above opening point (valve approximately 90% open) to the available system pressure. If the point falls between two curves, use the curve to the left (this gives an automatic safety factor). 5. From the point where the horizontal line intersects the available system pressure curve, draw a vertical line upwards until it intersects with the horizontal line from Step 2. 6. If the intersection falls on a valve size curve, this is the valve size. 7. If the intersection falls between two curves, use the curve to the left for the required valve size. WARNING Risk This product is made of copper alloy, which con- tains lead. The product is therefore not to be used on drinking water. 244

Articles in this issue

Archives of this issue

view archives of Wolseley - PENN Controls Products Catalog