verpressure Protection without Discharge of O Gas or Liquid–Under overpressure conditions, Types 634 and 634M shutoff valves stop the flow of gas or liquid rather than letting it vent to atmosphere.The Type 634M shutoff valve with external registration requires a control line and is installed upstream of a pressure-reducing regulator (Figure 3). The Type 634 shutoff valve with internal registration is installed between a pressure-reducing regulator and a downstream system or equipment (Figure 2). Typical Constructions Introduction Types 634 and 634M high-pressure shutoff valves (Figure 1) serve to provide overpressure protection by containment. Types 634 and 634M High-Pressure Shutoff Valves TYPE 634M SHUTOFF VALVE WITH STANDARD PIPE PLUGS IN BODY SIDE TAPPINGS TYPE 634 SHUTOFF VALVE WITH OPTIONAL tank VALVE IN UPSTREAM BODY SIDE TAPPING Figure 1.
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