Two different concepts are available. The “Single
way” designed to be used when the process system does not allow any interruption for emergency maintenance of the PSV. A quick
change flow way can easily be made by switching over the rotating disc enabling pressurization of the second PSV while closing
the pressure way of the first PSV, which therefore provides a continuous protection of the process system.
The “Dual way” designed when two PSV have to protect a pressurized vessel and both have to relieve 100%
of the capacity simultaneously. (Case of liquefied gas storage vessels). In this case the rotating disc is set in the median
position of both ways (fig 1 top image). In case of one of the PSV, same as above the corresponding way can be temporarily
closed, the other staying open and the second PSV then insuring the full protection of the vessel (fig 2L - bottom left image or fig 2R bottom right image).
“Starvalve” is designed to provide a highly reduced “Pressure Drop” in order to prevent risk of chattering of
the PSV when discharging. Sealing of discs made with soft material offering a premium tightness of the closed way. Soft
goods are offered to meet with the operating conditions. “Starvalve” materials of construction correspond with those used
in the Sarasin-RSBD spring loaded and pilot operated PSV ranges, from standard carbon steel up to the most elaborated stainless
and alloy steel.
“Starvalve” can be supplied with the following accessories:
• Bleed valves to depressurize the closed way
• Padlock
system to prevent changing of way inadvertently
• Linkage to couple two Starvalve as described on
page 8 in the brochure which is available to download. |