Gauge protection valve
Page 67
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A gauge protection valve introduced by Hale, Hamilton (Valves), provides adequate protection for expensive test gauges and equipment from failure through over pressurization.
The valve----the GPV4 Mk1—is suitable for use with gases and liquids and is supplied in two versions, the first for cut-off pressures up to 500 psi. and the second for pressures up to 4,000 psi. This latter figure is the maximum working pressure for both models.
The requirement for long and reliable service has taken design precedence over initial cheapness. The number of moving components has been kept to the minimum and the spool valve incorporated ensures simple maintenance requirements.
Inlet, exhaust and gauge connections are provided along
with panel-mounting facilities and an important advantage of the unit is that the gauge which is being protected is vented to atmosphere after isolation takes place. Thus an observer will see the following sequence of events as the supply pressure rises; a, the gauge pointer moving with rise of pressure; b, the pointer stop moving at cut-off pressure:. c, the pointer drop back to zero.
This arrangement clearly indicates to the operator that the gauge protection valve has worked satisfactorily and false gauge readings are eliminated.
At present the unit is manufactured in aluminium alloy but an aluminium bronze version may be supplied to special order. Made by: Hamilton (Valves) Ltd., Frays Mill Works, Cowley Road, Uxbridge, Middx.