Cla-Val 61-02 Deep Well Pump Control Valve

Protecting a well column and pipeline from starting surges

The Cla-Val 61-02 protects pipelines from surges caused by starting and stopping deep well pumps. It is a hydraulically operated diaphragm valve, built on the 100-02 Powertrol main valve and controlled by a CSM11 solenoid pilot valve. Separate adjustable flow control valves in the pilot system regulate the opening and closing rates, and a limit switch on the valve stem is the electrical interlock with the pump motor.

It differs from a booster-pump valve because it works on the pump column. With the pump off, the valve is wide open; at start-up it closes slowly.

Technical specifications

The deep well sequence

When the pump is started, the solenoid is energized and the valve begins to close slowly, discharging air and the initial rush of sand and water from the pump column to atmosphere. As the valve closes, pump output is gradually diverted into the main line, so no starting surge develops. When the pump is to stop, the solenoid is de-energized and the pump keeps running while the valve opens slowly and diverts pump output to atmosphere. As pump pressure falls, the main line check valve closes slowly, preventing shock or slam. When the valve is wide open, the limit switch releases the pump starter.

The valve operation is completely automatic under solenoid control, and the solenoid can be operated manually. Cla-Val recommends a 52-02 or 652-03 Surge Anticipator for power failure and surge protection.

Sizing the 61-02 and drain provisions

The datasheet gives a sizing method: take the system static pressure with the pump off, subtract 10 psi to find the design pressure, and select the valve from the flow chart at that pressure; with a static pressure of 70 psi the design pressure is 60 psi. The valve should be sized for a pressure loss at least 10 psi below the system static pressure. Suggested maximum flow is 460 gpm at 3 in, 800 gpm at 4 in, 1,800 gpm at 6 in, 3,100 gpm at 8 in, 7,000 gpm at 12 in and 25,000 gpm at 24 in.

Each time the valve opens or closes, water is discharged from the solenoid exhaust port, so provide a drain with an air gap. Use at least 1/2 inch tubing from the operating pressure connection to the system side of the check valve. Water to 180 °F is the pilot temperature limit, and the solenoid maximum pressure is 300 psi.

How the Cla-Val 61-02 works

The main valve is a diaphragm valve moved by line pressure through a solenoid pilot. When the pump starts, the solenoid closes the pilot and the valve shuts slowly. The pump flow is then turned gradually into the main line. When the pump stops, the valve opens slowly first, so the water in the line does not slam back.

Where the 61-02 is used

• Deep well pumps
• Water supply wells
• Irrigation wells
• Pump columns with sand or air
• Transmission pipelines

Selection checklist for the 61-02

• Valve size
• Body material
• Pressure class
• Flow rate of the pump
• Solenoid voltage
• Water temperature
• Opening and closing speed
• Limit switch for the motor

Installation, commissioning and maintenance notes for the 61-02

Fit the valve in the pump discharge line with the strainer on the pilot system. Wire the solenoid and the limit switch to the pump starter. Adjust the two flow controls to set the closing and opening times. Test the start and stop cycle and watch the pressure. Clean the strainer from time to time.

Requesting a quotation for the Cla-Val 61-02

Please send the valve size, the pressure class, the flow and the solenoid voltage. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

61-02 valve sizes

The sizes run from 2-1/2 inch to 24 inch.

61-02 end connections

The 2-1/2 and 3 inch sizes are threaded or flanged, and larger sizes are flanged.

61-02 body materials

The body is ductile iron, or cast steel and bronze in the smaller sizes.

61-02 pressure classes

The ductile iron valve is rated 250 psi in the 150 class and 400 psi in the 300 class.

61-02 pilot system

The pilot has a CSM11 solenoid, flow controls, a limit switch and a Y-strainer.

61-02 solenoid

The solenoid is in a NEMA Type 3 aluminum enclosure and uses 15.4 W AC.

61-02 water temperature

The water temperature goes up to 180 degrees F.

61-02 flow guide

The suggested flow runs from 300 gpm in the 2-1/2 inch valve to 25,000 gpm in the 24 inch valve.

61-02 weight

The weight runs from about 65 lb to 8,150 lb.

61-02 limit switch

The limit switch on the stem is the electrical interlock with the pump motor.

Valve records for the 61-02

Record the size, the flow control settings and the date of each strainer cleaning.

Choosing the right 61-02 size

Choose the size from the pump flow in the table, not from the pipe size alone.

Documents and quotation

The engineering data sheet E-61-02 is attached. To quote a 61-02, state the valve size, pattern, pressure class, trim, solenoid voltage, well flow and static pressure. The 81-02 check valve and booster pump valves are among the related products under Control Valves.