More recently, on the PEX plumbing and radiant heating networks as brass fittings water shutoff dominated by two products: “valve

cork entrance omental tapered Threaded Brass Ball Valve BVT012D” and “Sweat

Brass Ball Valve BVS012D”. Passport service life of tube-omental valve – 8 years, the average life-at least 1500 cycles, time to failure

– at least 400 cycles. In fact, these valves after 40-50 cycles begin to be capricious: cotton gland packing into a brown porridge, soaked

in water, and the cone stop tube, originally friction to the body under the influence of abrasive solids and sludge sediment in the water

begins to hang out in the body, passing water in the closed position. If you also take into account the extremely high coefficient of local

resistance plug valves (3,5-5,7), it is not surprising that plumbers often just throw the locking cap, leaving the body dubious backdrop of

the pipeline.
As sleeved valves, then the passport MTBF of 1,300 cycles, their actual performance is enough for 20-40 cycles, after which the sediment

accumulated on the sealing saddle, do not allow completely block the flow by turning the valve itself in another “architectural

extravagances.” Moreover, the coefficient of local resistance they simply record – from 16 to 20. That is, at a flow rate of 1 m / sec,

passing through the valve, the pressure of the liquid is reduced by 1 m of water.

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