BURKERT 347758 Type 2031 is an externally controlled 2/2-way diaphragm valve consisting of a pneumatically operated piston actuator, a diaphragm, and a stainless steel valve body. The proven and robust PPS actuator ensures reliable operation in hygienic or aggressive environments. The flow-optimised valve body with minimal dead space enables high volume flow rates and a wide range of possible applications.

Functionality

Depending on the control function, spring force or pneumatic pilot pressure generates the closing force. A spindle connected to the actuator piston transfers the force to the compressor, which presses the diaphragm against the weir in the valve body.

• Control function A (CF A): Pneumatically operated 2/2-way on/off valve. Bidirectional. Closed by spring force in rest position.

Technical Data

• Operating medium: Neutral gases and liquids, ultrapure, sterile, aggressive or abrasive media.
• Control medium: Neutral gases, air.
• Permissible ambient temperature (PPS actuator): +5 °C to +140 °C (for actuator size ≤80).
• Medium temperature (Advanced PTFE/EPDM): -5 °C to +143 °C (Steam sterilisation max. +150 °C for 60 min).
• Valve body material: Stainless steel.
• Port connection: Weld end.

Risk of bursting due to overpressure

Do not exceed the maximum permissible pilot pressure or maximum permissible operating pressure. Observe specifications on the type label.

Installation

The valve can be installed in any position, preferably with the actuator facing up.

Ensuring Self-Draining

The installer and the operator are responsible for ensuring self-draining. For optimum self-draining, the inclination angle of the pipeline should correspond to the valid ASME BPE standard. The self-draining angle (α) depends on the size of the valve body and the inner diameter of the port connection.

Welding the Valve Body

Damage to the diaphragm or the actuator

The diaphragm and actuator can be damaged when welding or bonding the valve body into the pipeline. Remove the actuator and diaphragm from the valve body before installation.

1. Remove the actuator from the valve body.
2. Weld the valve body into the pipeline.
3. After welding the surface of the valve body, smooth by sanding if necessary and clean carefully.
4. Install the actuator on the valve body.

Maintenance

The device actuator is maintenance-free if the instructions are followed. Components subject to natural wear are seals and the diaphragm.

• The relief bore must be inspected at regular intervals for any medium leakages.
• After the first steam sterilisation and when required: Tighten the body screws crosswise.
• After 10^5 switching cycles at the latest: Check the diaphragm for wear.