Installation of a three-way valve

Rules for installing three-way valves:

• Pressure gauges should be installed before and after the valve.
• A mesh filter should be installed before the three-way valve.
• The valve body should not be subjected to torsional, tensile, bending, or compressive loads.
• The direction of the arrow on the body should coincide with the direction of the fluid flow at the installation site.
• To achieve optimal regulation before the mixing three-way valve, it is necessary to throttle the excess pressure.
• Coupling fittings in heating substations connected to heating networks may only be installed with the consent of the heat supply organization.
• The three-way valve should be installed on a horizontal or vertical section of the pipeline so that the valve is not located above the electric actuator unless otherwise specified in the installation instructions.
• Different manufacturers provide different data, but on average, it is recommended to maintain straight sections of 5DN before and 10DN after the regulating valve. Otherwise, the characteristics of the valve may differ from those stated in the technical description.

Sequence for packing a threaded connection

1. Take a flax fiber string with enough threads so that its twisted diameter is approximately equal to the depth of the thread. The length of the string should provide for 1.5-2 times more windings than the number of thread turns.

2. Starting approximately 50-70 mm from the beginning of the string, slightly twist it, place it in the first thread turn, and, holding it with your hand, tightly wind a long branch of the string clockwise, placing it in each thread turn.

3. When reaching the end of the thread, continue winding with a second layer, shifting the turns to the beginning of the thread. The length of the second layer winding should be approximately equal to 2/3 of the thread length.

4. Wind the remaining end of the string (50-70 mm) similarly clockwise, from the end of the thread to its beginning.

5. Apply a layer of sealant to the winding surface.

6. Tighten the connecting elements by hand. With correct packing, the assembled element should turn 1.5-2 full rotations.

7. Continue tightening the element with a wrench or a torque wrench. In case the assembled element needs to be in a specific position, complete tightening it in the necessary position of the element.

With proper packing, during tightening, the force should not exceed the tightening torque listed below:

Tightening torques for flange connections

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