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Mastering Your Irrigation System: A Guide to Troubleshooting K-Rain Indexing Valves

Mastering Your Irrigation System: A Guide to Troubleshooting K-Rain Indexing Valves

Indexing valves allow an irrigation system to change zones.  Easy to install and maintain, K-Rain's patented hydraulic actuated indexing valve changes zones when the water flow is interrupted. These valves are ideal for pump applications, on site waste water disposal and reclaimed water systems. Our 4000 and 6000 series replace the old Hydrotek models.



K-Rain Indexing Valves

The 4000 Series Automatic Indexing Valve offers cost-effective and reliable control to multiple zoned irrigation systems. It has the versatility to operate on pump or city water systems and the flexibility to change the number of operating zones quickly and easily.

K-Rain Indexing Valves


The 6000 Series Indexing Valve is a water flow operated valve which acts as a manifold. The valve cycles from zone to zone in a clockwise fashion each time the water flow is stopped and started. With its metal die cast body, the 6000 Series Indexing Valve is capable of handling high pressure applications. The 6000 Series Valves are recommended to be used on pump fed systems and can also be used on higher flow pressurized city water systems.

K-Rain Indexing Valves


If you're having issues with your K-rain indexing valve, don't worry. With a little bit of troubleshooting, you can diagnose the problem and get it working properly again. Here are some steps to follow:


K-Rain Indexing Valves

Step 1: Check for Clogs

One of the most common issues with indexing valves is clogs. Check to make sure that there are no obstructions in the valve body or the inlet and outlet pipes. If you find any, use a plumbing snake or a wire hanger to remove them.

Step 2: Check the Valve's Position

The valve's position can affect its operation. Make sure that the valve is in the proper position for the current cycle. You can usually find the correct position in the valve's manual.

Step 3: Check the Diaphragm

The diaphragm is an important component of the valve, as it controls the flow of water. If the diaphragm is damaged or worn out, it can cause the valve to malfunction. To check the diaphragm, remove the cover from the valve and inspect it. If it is damaged or worn out, replace it.

Step 4: Check the Solenoid

The solenoid is the component of the valve that opens and closes the diaphragm. If the solenoid is faulty, the valve will not function properly. To check the solenoid, use a multimeter to test its resistance. If the resistance is outside the normal range, replace the solenoid.

Step 5: Check the Controller

The controller is responsible for sending signals to the solenoid to open and close the valve. If the controller is not working properly, the valve will not function as it should. Check the controller's manual for troubleshooting tips, or contact the manufacturer for assistance.

Step 6: Check Wiring Issues

Faulty wiring can also cause the valve not to change zones. Ensure that the wiring is correctly connected to the controller and the valve solenoid. Inspect the wiring for any damage or corrosion and replace any faulty wires.

K-Rain Indexing Valves


If none of these steps solve the problem, you may need to replace the entire valve. However, with a little bit of troubleshooting, you can often get your K-rain indexing valve working properly again.



Q. Why does my Valve Not Change or Cycle to Next Zone or Outlet?

A. CAUSE: The stem and disk assembly is not rotating when the water flow is turned OFF and then back ON.

SOLUTION: Ensure there is no debris inside the cam. Clean and carefully reinstall the cam.

SOLUTION: If fewer than the maximum number of outlets are being used, check the installation of the cam. Ensure that the stem and disk assembly is not being held down by an improperly installed cam.

SOLUTION: Remove the valve top and check for proper movement of stem and disk assembly. Check for and remove any debris or foreign objects that may jam or retard the movement of the disk.

SOLUTION: Check for freedom of movement of stem and disk assembly up and down over the center pin in bottom of valve. Scale deposits may build up on the pin and hold stem and disk assembly down. Clean pin and again check for freedom of movement.

SOLUTION: Be sure that all operating outlets are not capped and that the flow to operating zones is not restricted in any manner. This would cause pressure to build up in the valve and lock the stem and disk assembly in the down position.

Q. Water Comes Out of all the Valve Outlets what can be the cause?

A. CAUSE: Stem and disk assembly not seating properly on valve outlet.

SOLUTION: Check for sufficient water flow. A minimum of 10 GPM is required to properly seat the disk. For water flow between 6 and 10 GPM, a stem and disk assembly with a lighter spring is available.

SOLUTION: Remove the valve top and check the inside walls to ensure that nothing is interfering with the up and down movement of the stem and disk assembly inside the valve.

CAUSE: Too many sprinkler heads on a zone will cause insufficient pressure for disk to seat over valve outlet.

SOLUTION: Reduce the number of heads on the zone to obtain the proper sprinkler operating pressure.

Q. How can I prevent Valve Skipping Outlets or Zones?

A. CAUSE: For a pump installation, the pump may be losing its prime, causing the water flow to surge. This will cause the valve to cycle quickly several times, skipping one or more zones. Verify that the flow to the valve is constant by removing the valve top and watch the flow when the pump is turned ON after having been OFF for at least 15 minutes. The flow should be steady and uninterrupted.

SOLUTION: Seal any pump suction line leaks.

SOLUTION: Replace or install suction line check valve to prevent pump from losing its prime.

CAUSE: The stem and disk assembly is being advanced past the desired outlet.

SOLUTION: Ensure that the correct cam for the desired number of zones is installed and that the outlet lines are installed to the correct outlet po


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