Discussion on safety valve issues
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This post was last edited by WQC on 2010-11-3 at 16:24. According to relevant regulations, hand valves must not be installed before or after a safety valve; however, in my experience, most safety valves have hand valves at both their inlet and outlet, and some of them even come equipped with bypass valves
According to the **Regulations on Safety Inspection of Pressure Vessels issued by the Quality and Technical Supervision Bureau, it is generally not advisable to install stop valves between safety valves and pressure vessels. To enable online calibration of safety valves, a rupture disc device can be installed between the safety valve and the pressure vessel. For pressure vessels containing media with extremely high, high, or moderate toxicity, flammable media, corrosive or viscous media, or valuable media, in order to facilitate the cleaning and replacement of safety valves, a shut-off valve may be installed between the safety valve (rupture disc device) and the pressure vessel only with the approval of the technical responsible person in charge of pressure vessel safety at the facility using the vessel, and after reliable preventive measures have been put in place.