SI/DP

Function and Description

PROTEGO^® SI/DP  Internal Safety Valves  (in-tank valves) are used as additional Shut-off Valves for double-walled containers, e.g., for storing liquefied gases, cryogenic gases, or other low temperature products or chemicals.

The external connection piece of the housing is usually fitted with a gate valve that is provided by the customer and aids the normal operating procedure. During normal operation, the valves are kept in the open position. It is only closed in case of emergency or for necessary repairs to the gate valve.

The key feature of these valves is the shut-off element inside the container.

The Internal Safety Valve consists of three housing parts (1) with lateral connecting nozzle (2) for installation of pipeline; a valve cone (3) with sealing (4); and a pneumatic actuator (5). The lapped valve seat (10) and the seal guarantee the desired tightness. Bushings (8) guide the split valve spindle (6), which is equipped with double universal joint (7). Two compensators (9) are provided to accommodate the change in length due to temperature variations.

The Internal Safety Valve is operated/opened by a pneumatic actuator. The required closing force is provided by sufficiently dimensioned compression springs installed in the actuator. The controls must be designed in a way so that in the event of a malfunction, i.e., if the control substance (compressed air for the actuator and/or electrical power for the 3-way solenoid valve) fail, the internal safety valve automatically seals tightly.

By attaching an additional element, the Internal Safety Valve can also be opened or closed manually. This attachment must be removed for the valve to operate automatically.

The PROTEGO^® SI/DP is available in various nominal sizes. Optionally, the Internal Safety Valve can be equipped with an internal nozzle to connect to a suction and filling pipe or a swing pipe system.