Comparing Valve Types

Design Previous common practice has been to use two valves (Fig 1), such as plug or ball valve designs, in series with a bleed facility located between them in order to establish the sealing integrity of the upstream valve. This configuration is far from optimum as more space is required, with considerable extra weight quite apart from the additional maintenance requirements of having two valves and the extra associated costs.

The Solent & Pratt Double Block and Bleed design (Fig 3) utilizes our well established, Triple Offset segment valve (TOSV). This compact Double Block and Bleed Design negates the need for using two valves in series.

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