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This article describes using a cycle stop valve or similar device as a cure for well pump short cycling - too frequent turning on and off of the water pump.
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Water Pressure Regulation and Well Pump Life Extension using Cycle-Stop Valves?
According to manufacturer Cycle-Stop Valves, Inc.
A Cycle Stop Valve or CSV is a simple device that drastically reduces the number of times a pump is cycled on and off. The Cycle Stop Valve can be used with very small pressure tanks and still double or triple the life of any pump or motor. The CSV controls the amount of water being pumped to exactly match the amount of water being used.
This means the CSV can be used with very small pressure tanks because there is no extra water being pumped to cause the tank to fill. Pumping more water than is being used is what causes the pump to cycle on and off repeatedly. Cycling on and off repeatedly causes the pump, motor, controls, and bladder pressure tank to wear out prematurely.
The Cycle Stop Valve does this by supplying water for the home owner at a constant pressure. Pressure in the house remains steady while a single shower is running. When additional water is needed for a second shower, washing machine, pressure washer, irrigation sprinkler, etc., the Cycle Stop Valve opens more to supply the extra water needed. The person in the shower will never see a change in pressure or be scalded by hot water when additional water is used elsewhere in the home.
In residential applications served by wells and pumps with modest water flow rates (under 10 gpm), when filling a bath tub or running multiple plumbing fixtures at once, the water flow in the building will exceed the pump's capacity, and the flow rate is limited to the pumping rate that the pump itself can provide. In such installations, we aren't sure that a Cycle-Stop valve will be of much benefit to the equipment.
The company describes residential applications at http://www.cyclestopvalves.com/homeowners_1.html and says that their valve will reduce the well pump on-off cycling rate.
But in applications served by a submersible well pump capable of higher pumping rates, and provided that the well flow rate also supports a higher water flow rate, the CSV may indeed be of benefit to consumers. We recommend that you discuss the details of your well and pump equipment with the company before ordering a product.
If your well pump is short cycling, before fixing the problem with a Cycle-stop type valve, be sure that you don't have a more serious underlying problem with the equipment - see WATER PUMP SHORT CYCLING [link just below] for details.
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Technical Reviewers & References
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-  Cycle Stop Valves, Inc. is a manufacturer of water pressure regulating devices that the company explains can extend the life of a water pump.
The company, located in Lubbock, TX, can be contacted at email@example.com or at 800-652-0207.
"Cycle Stop Valves, Inc. manufactures constant pressure pump control valves and the Cycle Sensor pump monitors. Our shop is located in Lubbock, TX. We started this venture in the back of our pump and drilling business in 1993. As with many new products, necessity is the mother of invention. Our frustration with variable speed drives is what led us to a simpler, more dependable, less expensive solution using valves. We installed our last VFD in 1992."
- Access Water Energy, PO Box 2061, Moorabbin, VIC 3189, Australia, Tel: 1300 797 758, email: firstname.lastname@example.org Moorabbin Office: Kingston Trade Centre, 100 Cochranes Rd, Moorabbin, VIC 3189
Australian supplier of: Greywater systems, Solar power to grid packages, Edwards solar systems, Vulcan compact solar systems, water & solar system pumps & controls, and a wide rage of above ground & under ground water storage tanks: concrete, steel, plastic, modular, and bladder storage tanks.
- Pumptrol® Pressure Switch Adjustment, Square D, Schneider Electric Corporation, 8001 Knightdale Blvd., Knightdale< NC 27545 1-888-778-2733 - Square D Technical Library, web search 07/24/2010 original source: http://ecatalog.squared.com/techlib/docdetail.cfm?oid=09008926800a93be
- 9013 Pumptrol® Commercial Pressure Switches Type F and 9013 Commercial Pressure Switches Type G, Catalog, SquareD, Schneider Electric Industries SAS, Schneider Electric Industries SAS, web search 02/23/2011, original source:
Pressure-Float-Vacuum Switches/Pressure Switches-Water and Air/9013CT9701.pdf
Square D is a brand of Schneider Electric.
- Class 9013 Square D Commercial Pressure Switches: Water Pump Pressure Control Switch Class 9013, Type F, G, Manual, Square D Company, 8001 Highway 64 East, Knightdale, NC 27545-9023, USA, (919) 266-3671, www.squared.com,
web search 02/24/2011, original source: stevenengineering.com/tech_support/PDFs/45COM.pdf. Quoting:
The Type FSG, FYG, FRG - PUMPTROL® Water Pump Pressure Switches are used to control Water Pump Pressure Switches are used to control
electrically driven water pumps and have the following features:
- The Type FSG is the standard water pump switch, suitable for all types of pumps: jets, submersible,
- The Type FYG is designed to meet higher horsepower and pressure requirements.
- The Type FRG is reverse acting: the contacts open on falling pressure.
All are diaphragm actuated.
The Type G - PUMPTROL® Commercial/Light Industrial Pressure Switch is used to control electrically
driven water pumps and air compressors. It has higher electrical ratings for direct control of motors in
pump and compressor applications. The Type G switch is diaphragm actuated and has contacts that
open on rising pressure.
- Smart Tank, Installation Instructions [ copy on file as /water/Smart_Tank_Flexcon.pdf ] - , Flexcon Industries, 300 Pond St., Randolph MA 02368, www.flexconind.com, Tel: 800-527-0030 - web search 07/24/2010, original source: http://www.flexconind.com/pdf/st_install.pdf
- Typical Shallow Well One Line Jet Pump Installation [ copy on file as /water/Jet_Pump_Grove_Elect_Jet_Pumps_1.pdf ] - , Grove Electric, G&G Electric & Plumbing, 1900 NE 78th St., Suite 101, Vancouver WA 98665 www.grovelectric.com - web search -7/15/2010 original source: http://www.groverelectric.com/howto/38_Typical%20Jet%20Pump%20Installation.pdf
- Typical Deep Well Two Line Jet Pump Installation [ copy on file as /water/Jet_Pump_Grove_Elect.pdf ] - , Grove Electric, G&G Electric & Plumbing, 1900 NE 78th St., Suite 101, Vancouver WA 98665 www.grovelectric.com - web search -7/15/2010 original source: http://www.groverelectric.com/howto/38_Typical%20Jet%20Pump%20Installation.pdf
- Water Fact Sheet #3, Using Low-Yielding Wells [ copy on file as /water/Low_Yield_Wells_Penn_State.pdf ] - , Penn State College of Agricultural Sciences, Cooperative Extension, School of Forest Resources, web search 07/24/2010, original source: http://pubs.cas.psu.edu/FreePubs/pdfs/XH0002.pdf
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