Installation of ball valve

• The valve can be installed in any position and with any flow direction.
• The valve body should not withstand bending, twisting, stretching, or compression loads from connected pipelines. If necessary, supports or compensators should be provided to reduce the load on the valve from the connected pipelines.
• Using the ball valve as a support for the pipeline is not allowed.
• When installing threaded ball valves, a gas wrench should not be used due to the possibility of deformation of the valve body.
• During the installation of a brass valve with a two-part threaded body, it should be rotated with a key from the side of the connecting pipeline. Otherwise, the valve body may be unscrewed.
• The end of the pipe should not reach the end of the valve thread.
• The axis of the control lever should be parallel to the axis of the opening in the ball.
• To seal a threaded connection, Teflon tape, hemp, glue, or sealant can be used.
• The passage of the working medium (leakage) through threaded connections and through the stem is not allowed.
• Cast iron ball valves should not be installed on pipelines subject to vibration.
• Welding work should not be performed near the installed ball valve.
• After installation, hydraulic tests of the section should be performed. The test pressure during pressurization should not exceed the test pressure set for each of the tested elements. During hydraulic tests, ball valves, except for drainage and cut-off valves, should be in the fully open position on the tested section.
• If there is a possibility of mechanical impurities in the water flow at the installation site of the ball valve, a mesh filter should be installed in front of the valve. Otherwise, abrasive wear of the ball may cause a breach of the sealing.

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:

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