Selection - PENN Controls - LIT-1900164 - V148 - Bulb controller - V148 Series Three-Way Pressure-Actuated Water-Regulating Valve

V148 Series Three-Way Pressure-Actuated Water-Regulating Valve Catalog Page
Product
Valves and Actuators > Water Valves > V148 Series Three-Way Pressure-Actuated Water-Regulating Valve
Document number
LIT-1900164
Revision date
2020-04-22

About this task

To make a rough field estimate of the size of valve for an application, find the valve size by locating a point on a flow chart that satisfies these requirements:

  • Water flow required by the condenser (Flow)
  • Refrigerant head pressure rise (PRISE)
  • Available water pressure (PAVAIL)

Follow these steps, and use the information obtained to locate a point on one of the flowcharts that satisfies all three steps.

Procedure

  1. Take the water flow required by the condenser (Flow) from information provided by the manufacturer of the condensing unit. If the manufacturer’s information is unavailable, use the following information to make a rough approximation of maximum water flow in gallons per minute (gpm) (cubic meters per hour [m3/hr]):
    • System Capacity (Tons of Refrigeration)
    • Outlet Water Temperature (Temp. Outlet)
    • Inlet Water Temperature (Temp. Inlet)

    Calculate the flow using the following formula:

    Figure 1. Flow Required

    Note: If the outlet temperature is unknown, assume it to be 10F° (5.6C° ) above the inlet temperature.
  2. Determine refrigerant head pressure rise above the valve opening point (PRISE) using the following steps:
    1. The Valve Closing Pressure (PCLOSE) is equal to the refrigerant pressure at the highest ambient temperature the refrigeration equipment experiences in the Off cycle. Use a Pressure-Temperature Chart for the refrigerant selected to find this pressure.
    2. To approximate the Valve Opening Pressure (POPEN), add about 7 psi (0.5 bar) for EK and AL models or 10 psi (0.7 bar) for GK1 and GL1 models to the Valve Closing Pressure.
      Figure 2. Valve Opening Pressure, EK and AL Models (Top) or GK1 and GL1 Models (Bottom)

    3. From the Pressure-Temperature Chart for the refrigerant selected, read the Refrigerant Condensing Pressure (PCOND) (operating head pressure) corresponding to the selected condensing temperature.
    4. Subtract the Valve Opening Pressure from the Refrigerant Condensing Pressure. This gives the head pressure rise.
      Figure 3. Refrigerant Head Pressure Rise

  3. Determine the available water pressure to the valve (PAVAIL) using the following steps. This is the actual water pressure available to force water through the valve.
    1. Determine the minimum inlet pressure (PIN). This is the water pressure from city water mains, pumps, or other sources.
    2. Pressure drop through condenser (ΔPCOND) is the difference in water pressure between the condenser inlet and the condenser outlet. Obtain this information from the condenser manufacturer.
    3. Estimate or calculate the pressure drop through all associated piping (PLOSS).
    4. Subtract the ΔPCOND and PLOSS from PIN. The result is PAVAIL.
      Figure 4. Available Water Pressure

  4. Select the proper valve size from the flowcharts by locating a point on a chart that satisfies the flow, the head pressure rise above opening point, and the pressure drop across the valve.

Results

Use these equations to convert between U.S. and S.I. units.

  • 1 dm3/s = 3.6 m3/h = 15.9 U.S. gal. /min. = 13.2 U.K. gal. /min.
  • 1 bar = 100 kPa = 0.1 MPa = 1.02 kg/cm2 = 0.987 atm = 14.5 psi
Figure 5. 3/4 in. V148EK Valve

Figure 6. 1 in. V148AL Valve

Figure 7. High Refrigerant Pressure 3/4 in. V148GK1 Valve

Figure 8. High Refrigerant Pressure 1 in. V148GL1 Valve

Figure 9. Pressure Connection Styles

Table 1. Selection Chart
Product Code Number Nominal Valve Size Inlet and Outlet Ports Pressure Connection Style Shipping Weight, lb (kg)
V148EK-1C 3/4 in. Union (Sweat) 46 7 (3.2)
V148GK1-001C 3/4 in. Union (Sweat) 5 7 (3.2)
V148AL-1C 1 in. Union (Sweat) 46 12 (5.4)
V148GL1-001C 1 in. Union (Sweat) 5 12 (5.4)