Pressure Relief & Bleed System
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MBB: Manual Body BleedHand operated bleed valve. The VE® Dual Expanding Plug Valve must always be bled in closed position. Bleed outlet should be plumbed for drainage to a reservoir.
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TRB: Thermal Relief to BodyThis system includes a thermal relief valve in order to relieve pressure build up which might occur in the body cavity from thermal expansion. The thermal relief valve automatically operates when the pressure in the body cavity goes 1.5 Bar (22psi) above pipeline pressure, unless the isolation valve is closed.
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MBTR: Manual Bleed and Thermal ReliefThis system is a combination of an MBV and a TRB. Combining an automatic bleed of the body and also check the seal integrity of the Dual Expanding Plug Valve.
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ABB: Automatic Body BleedThis system works when the valve is closing. The valve is opened mechanically before the VE® valve is fully closed, enabling the user to verify full closure when the bled fluid stops. There is also an isolating valve in the system with a lock open device, to avoid any human error. The bleed outlet should be plumbed for drainage to a reservoir.
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