There are significant differences regarding the installation requirements for mechanical isolation devices designed for low or high pressure shut off. The weight of the protection equipment is much higher for a device that will accept Pmax. For typical isolation valve sizes, a weight comparison is provided below:
|Normal Size||Low Pressure Isolation Valve||High Pressure Isolation Valve|
In addition to the weight of the device, the recoil forces must be managed by the ducting and its support system.
Designed to respond in the manner of an ‘air bag’ in a vehicle, when the IVE isolation valve is directed to close, an inflatable bladder immediately fills the body cavity to stop product flow and arrest flame propagation. This operating mode minimizes the reaction forces generated by the IVE valve. The BS&B Type IVE valve is available in sizes from 4” to 16” nominal diameter (100mm to 400mm). Activation of the valve can be by BS&B supplied pressure or optical sensors.