Basis HTML versie
Dual Expanding Plug Valve
| 20
Pressure Relief & Bleed System
The VE
®
Dual Expanding Plug Valve provides several different bleed systems and
a pressure relief device according to the requirements of API 6D. Due to the Double
Block function of the VE
®
Dual Expanding Plug Valve, thermal expansion of the liquid in
the body cavity can cause a significant increase of the pressure. To prevent this effect all
VE
®
Dual Expanding Plug Valves must be installed with a pressure relief device.
In order to satisfy customers demand, ERIKS-VE
®
has developed several types of Bleed systems. All these systems can be customized
with additional equipment like gauges, electronic flow-sensors etc.
MBB: Manual Body Bleed.
Handoperatedbleed valve. The VE
®
Dual Expanding PlugValvemust
always be bled in closed position. Bleed outlet should be plumbed
for drainage to a reservoir.
TRB: Thermal Relief to Body.
This system includes a thermal relief valve in order to relieve pressure
buildupwhichmight occur in thebody cavity fromthermal 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.
MBTR: Manual Bleed and Thermal Relief.
This 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.
ABB: Automatic Body Bleed.
This 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 systemwith a lock open device, to avoid any human error.
The bleed outlet should be plumbed for drainage to a reservoir.