Ball valve HBC 975

electropneumaticmanualfor control

SAFETY DEVICES HBC 975 The HBC 975 is a safety device (SAV) which quickly intercepts gas flow when the pressure it is monitoring reaches a preset limit due to an anomaly in the system, or when required by the operator at the installation point or from a remote point. HBC 975 is a safety device, also called slam-shut valve, suitable to quickly interrupt the flow of a gas when the pressure existing in the control point reaches the set calibration value. It is a valve featuring an extremely fast response time, adjustable within the range of 0.5 and 2 seconds. The tripping of the slam-shut device, besides occurring automatically when the predetermined set-point is exceeded, can also be enabled locally, by pressing the suitable button available on the pressure switch, or remotely, as a result of the monitoring of the system or network on which the slam-shut device is installed. As a result of the tripping of the slam-shut valve, the subsequent restoration of the normal operating condition,also called RESET operation , is carried out in a purely manual manner, after having verified and solved the causes that led to such tripping. HBC 975 is a slam-shut valve that can be used: ¢ In natural gas transport and/or distribution networks ¢ In networks for gaseous fluids in general, provided that they are not corrosive and are previously purified.