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How to Properly Install Butterfly Valves

Purple Flower

Installing a butterfly valve can present challenges. This blog post aims to provide a comprehensive guide to ensure you cover all the necessary steps when installing your butterfly valve. It also highlights essential factors to verify the proper functioning of the valve.

Pre-Installation & Inspection Guidelines:

1) Thoroughly inspect the valve, ensuring that the waterway is free from any debris or foreign particles. Additionally, ensure that the adjacent pipeline is clean to prevent potential damage to the seat and disc sealing surfaces.
2) Prior to installation, attach the actuator to the valve. This will aid in achieving accurate alignment of the disc within the valve seat.

3) Examine the valve's identification tag, verifying the materials used and the specified operating pressure. Confirm that these details are suitable for the intended application.

4) Verify the dimensions, threading, and length of the flange bolts or studs to ensure compliance with the required specifications. Verify the dimensions, threading, and length of the flange bolts or studs to ensure compliance with the required specifications.

WARNING! Installing the valve under conditions exceeding its specified ratings can result in personal injury or property damage.

Installation Procedure:

1) Align the connecting pipe flanges accurately before installing the valve. Create enough separation between the pipe flanges to allow the valve body to be situated between them without making contact with the flange surfaces (See Figure 1). Handle the valve with care to avoid potential damage to the disc or seat faces.

For Lug style valves:

  • Position the valve between the flanges.
  • Mount all necessary bolts between the valve and the mating flanges. Hand-tighten the bolts, but not all the way.

2) Prior to fully tightening the bolts, ensure the valve is centered between the flanges, then open and close the valve carefully to confirm free and unobstructed disc movement (see Figure 2).

3) Tighten the flange bolts uniformly, adhering to the sequence illustrated in Figure 3, to achieve consistent compression.

4) Open the valve to the maximum open position and then back to the fully closed position, examining the actuator travel stop settings for correct disc alignment. It is crucial that the valve operates without any interference.

5) The valve is now ready for operation.

**Note:** Install the valve with the disc in the "ALMOST CLOSED" state. The use of flange gaskets is not advised.

Belimo Butterfly Valve assemblies come in a variety of sizes, ranging from 2 to 24 inches, and can accommodate both 2 and 3-way applications. They are specifically designed for use in ANSI pipe systems that necessitate zero leakage. You can choose from assemblies equipped with either NEMA 2 or 4X housing, offering a selection of Cv values. This flexibility makes these valve assemblies a cost-effective control valve solution, particularly for large-scale applications with high flow demands.


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