Choosing the correct valve size - PENN Controls - LIT-125683 - V243 - V43 - Pressure Actuated Water Regulating Valve - V243 High Pressure Refrigerant - V43 Low and All‐Range Pressure Refrigerant

About this task

A correctly sized valve meets the requirements of the maximum water flow that you need but functions at an acceptable level when you need minimum flow. It does not water-hammer, cut, or wire-draw the seats and seating discs. To select the correct valve size for your application, see V43 capacity flow charts and V243 capacity flow charts.

Use the following steps to determine the appropriate valve size for your application:

Procedure

Locate the point where the valve is fully open on the y-axis. See Figure 1.
Draw a horizontal line from this point to where the line intersects with the water pressure available (WPA) curve. This is Point A.
Draw a vertical line from point A to where it intersects with the x-axis. This is Point B.
Point B is the maximum amount of water that the valve can flow, when fully open, under the stated conditions. See Figure 1.
Locate the maximum water flow that you need for your application on the x-axis. This is Point C.
Draw a vertical line from Point C to where the line intersects with the WPA curve. This Point D.
Draw a horizontal line from Point D to the left where it intersects with the refrigerant head pressure rise above opening point.
This is where the selected value meets the maximum flow requirement of the application.

Figure 1. Capacity chart

Use the flow charts to select the valve that is most appropriate for your application.