BURKERT 333947 (Type 2032) is an externally controlled 3/2-way pneumatic T-diaphragm valve designed for zero-deadleg branching, sampling, and distribution in hygienic and ultra-pure fluid systems. The unit combines a pneumatically operated PPS (polyphenylene sulphide) piston actuator, a PTFE diaphragm backed by an EPDM cushion, and a precision-machined stainless steel block T-body. Configured under Control Function A, the valve remains normally closed by internal spring force at rest, providing bubble-tight shut-off up to 10.00 bar static operating pressure. It handles process temperatures from -10 °C to +130 °C and withstands steam sterilisation cycles up to +140 °C for 60 minutes.

Engineered specifically for hygienic loop installations, the main pipeline connection (Port 1) features a 2-inch weld end conforming to ASME BPE and DIN 11866 Series C (outer diameter 50.8 mm, inner diameter 47.5 mm, wall thickness 1.65 mm). The branch weir matches diaphragm size 15 mm, reducing hold-up volume and stagnation zones. Internal fluid-contact surfaces achieve Ra ≤ 0.38 µm through electropolishing (or Ra ≤ 0.5 µm mechanical polish), ensuring full Clean-in-Place (CIP) and Steam-in-Place (SIP) compatibility for biotechnology, pharmaceutical, food, and beverage processes.

Construction & Operating Principle

Type 2032 operates via a pneumatic piston mechanism acting on a flexible diaphragm seal against an internal body weir. For Control Function A (normally closed), integrated compression springs maintain continuous downward closing pressure on the piston, spindle, and compressor. This keeps the diaphragm firmly seated across the weir in the unpressurised state. When pilot air between 5.0 and 7.0 bar is admitted into the lower control port, pneumatic pressure overcomes the spring pack to lift the spindle and open the branch passage.

The T-valve design routes the primary process media through the main run without cross-sectional disruption, while the branch port allows diversion or sampling directly at the pipe wall. The actuator body includes an integrated optical position indicator underneath a transparent polysulfone cap, displaying open and closed positions clearly during plant operation.

Technical Data & Operating Limits

Technical Parameter	Specification / Value
Type / Article Number	Type 2032 / 333947
Circuit Function	3/2-way, Control Function A (NC, normally closed by spring force)
Diaphragm Nominal Size (DS)	15 mm
Main Run Size (Port 1)	DN 50 / 2" (Outer Ø 50.8 mm, Inner Ø 47.5 mm, Wall 1.65 mm)
Pipe Standards	ASME BPE / DIN 11866 Series C
Valve Body Material	Stainless steel block material 1.4435 (DIN EN 10088) / 316L (ASTM A479)
Actuator Housing Material	PPS (Polyphenylene sulphide, autoclavable)
Diaphragm Material	PTFE with EPDM backing cushion (Type EA)
Piston Seal Material	FKM (Fluor rubber)
Operating Pressure Range	0.00 bar to 10.00 bar (PN 16 / Class 150)
Pilot Pressure Range	5.0 bar to 7.0 bar
Medium Temperature	-10 °C to +130 °C (Steam sterilisation max. +140 °C for 60 min)
Ambient Temperature	+5 °C to +140 °C (for PPS actuator)
Pilot Air Connection	G 1/4 female thread
Wetted Surface Quality	Internally electropolished Ra ≤ 0.38 µm (externally Ra ≤ 1.6 µm)
Certificates Included	Manufacturer test certificate 3.1, Factory certification 2.1 Membrane
Conformity & Compliance	FDA 21 CFR 177, USP Class VI, EC Regulation 1935/2004, 3-A Sanitary standard

Component Materials

Item No.	Component	Material Specification
1	Transparent cap	Polysulfone (PSU)
2	Actuator cover	Polyphenylene sulphide (PPS)
3	Pilot air ports	Stainless steel 1.4305 (G 1/4 thread)
4	Piston seal	FKM fluor rubber
5	Socket	Sinter metal
6	Intermediate interface / Bonnet	Stainless steel 1.4404 / 1.4308
7	Diaphragm	PTFE with EPDM backing membrane (EA)
8	T-Valve body	Stainless steel block 1.4435 / 316L

Dimensions & ASME BPE Connection Geometry

For article 333947 with diaphragm size 15, the welded T-body corresponds to product key pairing SODI-SA92 (DN 50 to DN 15) under ASME BPE / DIN 11866 Series C:

Dimension Code	Description	Value (mm)
Ø D1	Main pipe outer diameter (Port 1)	50.80 mm
s1	Main pipe wall thickness	1.65 mm
Ø D2	Branch pipe outer diameter (Port 2)	12.70 mm
s2	Branch pipe wall thickness	1.65 mm
A	Total face-to-face body length	113.0 mm
B	Main weld stub length	30.0 mm
C	Height from main axis to branch face	71.70 mm
E	Branch weld stub length	20.0 mm
F	Distance from center to outer body face	100.0 mm
G	Body width	64.0 mm
H	Body height profile	35.0 mm
I	Offset dimension	21.5 mm

Actuator dimensions for diaphragm size 15 (actuator size 63 / E) include outer diameter Ø A of 80 mm, clearance C of 52 mm, pilot port K of G 1/4, and overall actuator height H of 154 mm.

Pipeline Installation & Welding Requirements

In circular loop installations, mount Type 2032 with the actuator directed upwards or inclined according to system drainage requirements. Orient the bonnet such that one of the relief leakage detection bores is positioned at the lowest physical point.

Critical Pre-Welding Instruction

Before welding the stainless steel block valve body into the pipeline, the pneumatic actuator and diaphragm must be completely unbolted and removed. Excessive welding heat transferred through the valve seat will degrade the PTFE/EPDM seal and distort internal actuator components.

1. Depressurise the fluid pipeline and pilot air lines completely.
2. For Control Function A: apply compressed air to the lower pilot port (8) to lift the diaphragm from the body seat before loosening fasteners.
3. Loosen the body screws crosswise and withdraw the actuator and diaphragm sub-assembly.
4. Align and weld the block body into the pipeline according to ASME BPE welding standards.
5. Thoroughly flush and clean the valve body interior before reinstalling the diaphragm and actuator.

Maintenance, Diaphragm Replacement & Tightening Torques

The PPS actuator mechanism is maintenance-free under normal operating conditions. Routine inspection requires periodic visual checks of the bonnet relief bore for fluid leakage, signalling diaphragm wear.

Diaphragm Re-Torquing Interval

After the initial steam sterilisation cycle, or following maximum 100,000 switching operations, re-check and tighten all body screws crosswise. Muddy or abrasive media necessitate shorter inspection intervals.

When replacing the diaphragm:

• Apply pilot pressure to the lower port to release spring load from the seat.
• Disengage the diaphragm via the bayonet catch by rotating 90°.
• Ensure the replacement diaphragm tab aligns perpendicularly to the flow direction.
• Reassemble the body screws crosswise in three stages (approx. 1/3, 2/3, and full torque) without applying pilot pressure.

Diaphragm Size	EPDM / FKM Torques	PTFE / Advanced PTFE / GYLON Torques
DS 8	2.0 Nm	2.5 Nm
DS 15 (Article 333947)	3.5 Nm	4.0 Nm
DS 20	4.0 Nm	4.5 Nm
DS 25	5.0 Nm	6.0 Nm
DS 40	8.0 Nm	10.0 Nm
DS 50	12.0 Nm	15.0 Nm

All specified tightening torque values have an engineering tolerance of +10%.

Compatible Accessories & Valve Systems

Type 2032 integrates directly with decentralized automation units for position monitoring and distributed pilot control:

• Type 8697 Electrical Position Feedback Indicator: mounts compactly on the CLASSIC actuator, featuring mechanical or inductive limit switches and LED status indication with IP65/IP67 enclosure.
• Type 8801-TA Valve System: pre-tested factory assembly combining the 2032 T-valve with the 8697 feedback head, delivered fully configured for immediate plant commissioning.