1. Principle of operation
The purpose of the safety valve is to protect the equipment and installation against excessive pressure above the pressure limit. When the force coming from the pressure acting on the disc surmount with the weight of the working elements, the valve starts to open. A further increase in the pressure, required for the particular design of the valve, causes its full opening aided by the bell
2. Delivery condition
Supplied valves are tested and set for the required opening pressure. Valves are stamped on a nameplate fixed to the body and with the of signs on the edge of the outlet flange.
Set pressure is secured by sealing between the cap and bonnet. In order to secure the valve during transport, the lever is being attached to the outlet flange with a wire, and the flow holes are being plugged. For transportation the spindle is secured with a blocking screw, fastened with a metal strip. The external surfaces of the valve are painted.
3. Installation of safety valves
4. Operation of safety valves
Safety valves that serve as important elements of the devices and pressure systems require particularly careful and competent service. Any operational gasp may cause damage to the valve mechanism, and consequently lead to the total failure of the pressure system. Therefore, during the operation, pay special attention to:
The frequency of these activities depends primarily on:
After checking of the valve, move the lever to the original position. When checking the valve there is a possibility of contamination the sealing surfaces. In this case, again lift disc to remove these pollutions. If tightness was not obtained by this, the valve needs to be regrinded from the next stop of the pressure device.
5. Adjustment of the set pressure Weight loaded valves do not have any elements allowing their regulation. It is recommended to send the valve to the producer for adjustment.
6. Maintenance and repair of safety valves
In order to ensure correct operation of safety valves, the following conditions must be met:
Zetkama Safety Valve Fig 570
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