Quick Opening Closure


Quick actuating closures permit substantially faster access than expected with a standard bolted flange connection, and that allow opening by a single manoeuvre.

To open a Quick Actuating Closure safely, the system must be depressurized and isolated from any incoming flow or back flow. The quick actuating closures have be provided with a device connected to the atmosphere. This Device, after the correct depressurization process, must be opened to release any residual pressure and enable the opening manoeuvre of the quick actuating closure.


Safety and Environment


The safety device is “mandatory for ASME UG35”. 

Located in the upper point of the door, to be unaffected by sediment or wax formation, the device has been improved to be self-energized and suitable to prevent opening in case of positive pressure in the system or accidental opening. This peculiarity obliges the operator to properly depressurize the system, ensuring the opening in absence of pressure and preventing any accident. 

When opened the safety device is connected to the atmosphere to meet the code’s requirement.

For safety reasons, in the event of hydrogen sulfide in the system, the vent outlet is connected far from the operator.

The safety device body and internal are manufactured, as a standard practice, with 316 stainless steel, while the locking pin, is duplex material. The knurled handwheel is in bronze. Upon request internal in Alloy 625 or any other Nickel Alloy could be provided.

When the system is in the closed position, the locking pin, being self-pressure activated, lock the door closed.

When the system is in the open position the locking pin is withdrawn, the door is free and the vent hole through the piston is connected to the atmosphere.

The purpose of safety device can be summarized as follows: 

  • to lock the door in the fully closed position
  • to avoid opening if residual pressure is still present 
  • to warn the operators if pressure is still present 


The safety device system is manufactured in six (6) different sizes to be installed on a different closure size and rating.
The safety device locking pins are sized to withstand any wrong attempt of the operator to unscrew the tie rod and have been tested and certified by a Third Party Inspection body also as supplementary retaining system to held the clamp closed in event of tie rod failure.