Shallow Well Pump Check Valve: A Comprehensive Guide

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Shallow well pump check valves are essential components of well pump plumbing systems, as they prevent water from flowing back into the well when the pump turns off, protecting the system from various problems. The check valve’s function is to allow flow to move in one direction and prevent flow from moving in the opposite direction. A check valve opens when media flows through it and closes when the media stops flowing or if backflow occurs.

Technical Specifications of Shallow Well Pump Check Valve

The technical specifications of a shallow well pump check valve include:

  1. Flow Rate: The flow rate of a shallow well pump check valve typically ranges from 5 to 50 GPM (gallons per minute) or 0.3 to 3.2 L/s (liters per second), depending on the size and design of the valve.
  2. Pressure Rating: The pressure rating of a shallow well pump check valve is usually between 125 to 300 psi (pounds per square inch) or 8.6 to 20.7 bar, ensuring the valve can withstand the system’s operating pressure without leaking or failing.
  3. Temperature Rating: Shallow well pump check valves are designed to operate in a temperature range of 32°F to 140°F (0°C to 60°C), making them suitable for most well pump applications.
  4. Material: Common materials used for shallow well pump check valves include stainless steel, brass, and engineered plastics, such as PVC or polypropylene, which provide corrosion resistance and durability.
  5. Size: The size of a shallow well pump check valve is typically determined by the diameter of the pipe or tubing it is installed in, ranging from 1/2 inch to 2 inches, with 1 inch being a common size for residential well pump systems.
  6. Operating Principle: Shallow well pump check valves often use a spring-assisted poppet design, where a spring-loaded disc or ball opens to allow flow in the desired direction and closes to prevent backflow.
  7. Installation Requirements: Shallow well pump check valves must be installed with the arrow on the valve body pointing in the direction of the intended flow, and they may require specific fittings or adapters to ensure a proper connection to the plumbing system.

DIY Installation of Shallow Well Pump Check Valve

shallow well pump check valve

Installing a shallow well pump check valve requires some plumbing knowledge and skills. Here are the general steps:

  1. Choose the Right Valve: Select a check valve that matches the technical specifications of your well pump system, including the flow rate, pressure rating, temperature rating, material, size, and operating principle. Consider factors such as the well depth, pump capacity, and overall system design to ensure the check valve is properly sized and compatible.
  2. Locate the Installation Point: Determine the best location for the check valve in the plumbing system. It should be installed as close to the water source (well) as possible, and before any branches or tees in the piping.
  3. Prepare the Pipe: Shut off the power to the well pump and depressurize the system. Cut the pipe at the installation point, ensuring a clean, square cut. Deburr the pipe ends and clean them thoroughly to create a smooth surface for the check valve installation.
  4. Install the Valve: Apply a suitable sealant, such as Teflon tape or pipe dope, to the check valve’s threads. Insert the valve into the pipe, making sure the arrow on the valve body points in the direction of the intended flow (towards the pressure tank or distribution system). Tighten the valve securely using wrenches or pliers, taking care not to overtighten and damage the valve or pipe.
  5. Test the Valve: Restore power to the well pump and turn it on. Check the valve for any leaks, and listen for any hissing or gurgling sounds that may indicate a problem. Observe the pressure gauge and ensure the system is maintaining the desired pressure when the pump is running and when it is turned off.

Reference Links

  1. Well Pump Issues – check valve failure and low pressure
  2. Question about shallow well pumps and check valves : r/Plumbing
  3. Check valve between pump and tank – Love Plumbing & Remodel
  4. Well Pump Check Valve | Tameson.com
  5. Purpose of Check Valve combined with shallow well pump?