BURKERT 347772 Type 2031 is an externally controlled diaphragm valve consisting of a pneumatically operated piston actuator, a diaphragm, and a 2-way valve body. The proven and robust actuator with a plastic valve body 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.

The actuator features a compact, autoclavable design (PPS variant) and is equipped with an integrated, optical position indicator as standard. The valve is designed to control the flow of neutral gases and liquids, as well as highly purified, sterile, aggressive, or abrasive media.

Control Functions

The 347772 variant operates with Control function A (CF A):

• Description: Pneumatically operated 2/2-way on/off valve, bidirectional.
• Rest Position: Normally closed by spring force.

Technical Data

Permissible Temperatures

Ambient Temperature:

Actuator housing material	Actuator size	Permissible ambient temperature [°C]
PPS	≤80 (F)	+5...+140
PPS	100 (G), 125 (H)	+5...+90 (short-term up to +140)
PA	≤125 (H)	-10...+60
PA	≥175 (K)	-10...+50

Medium Temperature for Diaphragms: The specified medium temperatures only apply to media that do not attack the diaphragm materials or cause it to swell up. Do not use the diaphragms as a steam shut-off element.

Diaphragm material	Medium temperature [°C]	Comments
EPDM (AD)	-10...+143	Steam sterilisation max. +150°C for 60 min
FKM (FF)	0...+130	No steam, dry heat max +150°C for 60 min
PTFE (EA)	-10...+130	Steam sterilisation max. +140°C for 60 min
Advanced PTFE (EU)	-5...+143	Steam sterilisation max. +150°C for 60 min
GYLON® (ER)	-5...+130	Steam sterilisation max. +140°C for 60 min

Operating Pressure

Permissible operating pressure depending on medium temperature in plastic valve body:

WARNING

The information in the pressure-temperature diagram is important for material selection. Observe the permissible operating pressure, depending on the medium temperature!

Pilot Pressure

Risk of bursting due to overpressure

If the device bursts, escaping media may cause injuries, burns or scalds.

• Do not exceed the maximum permissible pilot pressure or maximum permissible operating pressure. Observe specifications on the type label.
• Observe the permissible ambient temperature and medium temperature.

Permissible pilot pressure:

Actuator material	Actuator size	Minimum pilot pressure [bar]	Maximum pilot pressure [bar]
PPS	40 (C)...125 (H)	2	7
PA	40 (C)...100 (G)	2	10
PA	125 (H)	2	7
PA	175 (K), 225 (L)	2	6

Installation

Installation Position

The valve can be installed in any position, preferably with the actuator facing up. For leakage detection, one of the relief bores in the diaphragm bonnet for monitoring leakages must be at the lowest position.

Ensuring Self-Draining

The installer and the operator are responsible for ensuring self-draining. The following points must be observed for optimum self-draining:

1. Inclination angle of the pipeline: The inclination angle is determined by the installer or operator. For pipelines, the inclination angles specified in the valid ASME BPE standard are recommended.
2. Self-draining angle for valve body: The self-draining angle (α) depends on the size of the valve body (diaphragm size) and the inner diameter of the port connection (nominal diameter). The marking for self-draining angles on the port connection serves as a guide and must point upwards.

β: Inclination angle of the pipeline | α: Self-draining angle | 1: Marking for self-draining