Block and bleed needle valves are commonly used where it is important to depressurize the pressure instrument after isolating it from the process. This allows a safe removal of the pressure instrument and replacing it with a new one. Secondly the vent port can be connected to drain tubing to remove the process gasses and fluids to a safe container in order not to vent it in the atmosphere. The vent port can also be used to connect reference instrumentation for periodic checks of the pressure instruments.

• Block and bleed – straight model

• Block and bleed – flat in line

• Block and bleed – flat angled

• Block and bleed – Angled forward

• Block and bleed – IEC – Angled forward

• Double block and bleed valve