SI/F

In-tank Valve Internal Safety Valve

Function and Description

The PROTEGO® in-tank valve type SI/F is a shut-off valve and protects the Downstream liquid lines of storage tanks and tanks in process plants of the chemical, pertochemical and pharmaceutical industries, thus increasing both safety and availability of the plants.

The in-tank valve SI/F (figure 1) consists of housing (1), mouthing flange (2), valve seat (3), valve disc (4) and sealing (5). The mouthing flange is welded into the tank Shell. The valve seat is replaceable. The valve seat and valve disc are lapped metallic surfaces and an additional O-ring is installed to ensure the required tightness. The spindle sealing (6) can be adjusted or replaced and is designed for a test pressure of 25 bar / 363 psi.

A gate valve that is supplied by the user and serves for normal operation is connected to the external nozzle of the housing. The internal safety valve is kept open under normal operating conditions. It is only closed for longer shut-downs, in case of emergency or for necessary repairs to the gate valve.

It is closed by an "internal sealing", e.g. the valve is closed inside of the tank. This ensures that the tank cannot leak in case of damage to external components or leakages in any connected pipelines.

The Special design of PROTEGO® in-tank valves of type SI/F is such that only the mouthing flange (2) is welded to the tank shell, and so most other parts can be replaced. Replacement of important external parts does not require the draining of the tank. This fact provides significant operation advantages.

Type SI/F by PROTEGO® is available in a range of nominal sizes and materials. Optionally, the in-tank valve can be eequipped with an internal nozzle (7) to connect to a suction and filling pipe or a swing pipe System (SI/FA).

Tank shut-off valves of this type are usually operated manually. Versions with an explosion proof electric actuator for direct or remote control are also available.

Alternatively it is possible to use special versions with pneumatic control (PROTEGO® SI/DP) under specific tank design (e.g. full containment tank system).

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