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Ball valve with a one-piece body

The most vulnerable place of traditional brass ball valves is a juncture group of two semibodies. As a rule, they are joined with a short (2–3 threads) metric thread with a step of 1.5 –1.25 mm, which when assembled is additionally fixed with anaerobic sealing adhesive.

It often happens that in course of assembly, due to poor quality threads and excess of admitted assembly torque, inherent stresses are formed in the body partition, which further cause fatigue cracks and article destruction.

In the exploitation conditions, the valve body may suffer substantial alternating axial loads and bending moments. In course of assembly, rather high torque is applied to it. Besides, the possibility cannot be excluded, that before installation into the design position the valve suffered impact loads (falling or shaking), which could entail cracking of fragile anaerobic sealant.

All this proves that it is much more advantageous to have a valve with the body not weakened with threaded joint.

That’s just the ball valve VT. 290. Its one-piece body is made of nickeled hot-pressed brass. Ball gate axis is turned at 45° with respect of valve axis. The gate chamber lies beyond the joined pipelines axis and is closed with a rubber plug. All loads, transferred from pipelines, are perceived by a monolithic valve body. Besides that, the valve has become fully repairable. Having unwound the plug, one may extract, clean or substitute any its element (seat rings, ball gate or a stem).

Hydraulic characteristics of the ball valve with one-piece body VT.290 are little inferior that the characteristics of traditional full-bore valves. For example, the valve with nominal diameter ½” has local resistance coefficient 0.55 (a valve of standard construction has LRC = 0.26).