BURKERT 312117 (Type 2032) is an externally controlled, pneumatically operated T-diaphragm valve engineered for hygienic sampling, dosing, or distribution duties. The unit comprises a pneumatically actuated CLASSIC piston actuator with a polyphenylene sulphide (PPS) housing, a high-temperature EPDM diaphragm, and a machined block stainless steel T-valve body. Its zero-deadleg configuration enables thorough draining and high flow rates across clean steam, ultra-pure water, and sterile fluid processes.

Configured under article number 312117, this assembly operates under control function A (normally closed by internal spring force) with 3 fluid ports and 2 switching positions. It features a 20 mm nominal orifice, pilot pressure range of 5.5 to 7.0 bar, and medium pressure ratings from 0 to 10 bar (PN 16 / Class 150). Process connections are executed as 2" ASME BPE (DIN 11866 Series C) weld ends with an outer tube diameter of 50.8 mm and a wall thickness of 1.65 mm. The valve is fully CIP/SIP capable, handling continuous medium temperatures from -10 °C to +143 °C and short-term steam sterilization up to +150 °C for 60 minutes.

Technical Specifications

Specification Parameter	Value (Article 312117 / Type 2032)
Valve Construction	Complete valve assembly
Pilot Actuator Type	CLASSIC pneumatic piston actuator, PPS housing
Control Function	Control function A (CF A): normally closed by spring force
Number of Fluid Ports / Positions	3 ports / 2 positions
Nominal Diameter (Orifice)	20 mm (Diaphragm size 20)
Main Port Connection Size	DN 50 (2 inch outer diameter: 50.8 mm, ID: 47.5 mm)
Port Wall Thickness	1.65 mm (0.065 in)
Pipe Standard Compliance	ASME BPE / DIN 11866 Series C
Connection End	Weld end (Port 1 and Port 2)
Operating Medium Pressure	0.00 bar to 10.00 bar
Nominal Pressure Class	PN 16 (DIN EN 1333) / Class 150 (DIN EN 1759)
Pilot Pressure Range	5.5 bar to 7.0 bar
Pilot Air Connection	G 1/4 female thread (sintered exhaust socket)
Valve Body Material	Stainless steel block 1.4435 (DIN EN 10088) / 316L (ASME BPE)
Diaphragm Material	High-temperature EPDM (AD code)
Actuator Piston Seals	FKM (fluorinated rubber)
Medium Temperature Range	-10 °C to +143 °C (steam sterilisation to +150 °C for 60 min)
Ambient Operating Temperature	+5 °C to +140 °C (PPS actuator housing)
Manual Override	None
CIP / SIP Capability	Yes / Yes
Test Certificates	EN 10204 3.1 inspection certificate, diaphragm 2.1 certificate

Control Functions

The Type 2032 platform supports three standardized pneumatic actuation modes:

• Control Function A (CF A): Pneumatically operated T-valve, normally closed by spring force in the unpressurized rest position.
• Control Function B (CF B): Pneumatically operated T-valve, normally opened by spring force in the rest position.
• Control Function I (CF I): Double-acting pneumatically operated T-valve where opening and closing switching movements are controlled by external air pressure.

INFO

Article 312117 utilizes Control Function A. Internal heavy-duty mechanical springs maintain tight shut-off up to 10 bar static differential line pressure without requiring pilot air pressure.

Materials of Construction

All components coming into contact with media and external atmospheric elements are engineered from traceable industrial-grade alloys and performance polymers.

Actuator Construction (Sizes 40 to 125 mm)

Item	Element Description	Material
1	Transparent visual indicator cap	Polysulfone (PSU)
2	Actuator cover	Polyphenylene sulphide (PPS, standard) / Polyamide (PA, on request)
3	Pilot air ports	Stainless steel 1.4305
4	Piston seal	Fluor rubber (FKM)
5	Socket / Breather	Sintered metal
6	Interface connector	Stainless steel 1.4404
7	Diaphragm	EPDM (AD), PTFE/EPDM (EA), Advanced PTFE/EPDM (EU), GYLON®/EPDM (ER)
8	Valve body	Stainless steel block 1.4435 / 316L

Actuator Construction (Sizes 175 and 225 mm)

Item	Element Description	Material
1	Actuator cover	Polyamide (PA)
2	Pilot air ports	Stainless steel 1.4305
3	Diaphragm bonnet	Stainless steel 1.4308
4	Diaphragm	EPDM (AD), PTFE/EPDM (EA), Advanced PTFE/EPDM (EU), GYLON®/EPDM (ER)
5	Valve body	Stainless steel block 1.4435 / 316L

Available Diaphragm Materials

• EPDM (Code AD): Working medium temperature -10 °C to +143 °C (steam sterilization up to +150 °C for 60 min). Installed on 312117.
• PTFE/EPDM (Code EA): Working medium temperature -10 °C to +130 °C (steam sterilization up to +140 °C for 60 min).
• Advanced PTFE/EPDM (Code EU): Working medium temperature -5 °C to +143 °C (steam sterilization up to +150 °C for 60 min).
• GYLON® / EPDM Laminate (Code ER): Working medium temperature -5 °C to +130 °C (steam sterilization up to +140 °C for 60 min).

Approvals and Compliance Standards

• ATEX / IECEx Explosion Protection: EPS 18 ATEX 2 008 X / IECEx EPS 18.0007X (Category 2G/2D, II 2G Ex h IIC T4…T2 Gb, II 2D Ex h IIIC T135 °C…T300 °C Db) under variable code PX51.
• Hygienic Conformity: 3-A Sanitary Standards Inc. (code PE05).
• Food Contact Regulations: FDA 21 CFR 177.2600 (elastomers) and 177.1550 (fluorocarbons), Regulation (EC) No 1935/2004.
• Pharmacopeia Testing: USP Class VI biological reactivity standards.
• Fugitive Emissions: TA-Luft compliance certification (code PM01).

ATEX / IECEx Temperature Class Parameters

Temperature Class	Maximum Surface Temperature	Permissible Ambient Temperature	Maximum Medium Temperature
T2	+300 °C	-40 °C to +130 °C	+285 °C
T3	+200 °C	-40 °C to +130 °C	+185 °C
T4	+135 °C	-40 °C to +100 °C	+125 °C

Dimensions and Actuator Sizing

Actuator Dimensions (Basic CLASSIC Configuration MT85)

Diaphragm Size	Actuator Size ∅	Actuator Outer ∅ A [mm]	C [mm]	Pilot Port K	Height H [mm]	Total Height with MT85 [mm]
8	40 (C)	53	34	G 1/8"	111	207
15	50 (D)	64	39	G 1/8"	137	233
15	63 (E)	80	52	G 1/4"	154	249
20	63 (E)	80	52	G 1/4"	165	261
20	80 (F)	101	52	G 1/4"	186	281
25	63 (E)	80	52	G 1/4"	170	266
25	80 (F)	101	60	G 1/4"	190	286
40	100 (G)	127	73	G 1/4"	246	339
40	125 (H)	158	86	G 1/4"	284	377
50	100 (G)	127	73	G 1/4"	254	347
50	125 (H)	158	86	G 1/4"	288	381
65	175 (K)	211	130	G 1/4"	350	437
80	175 (K)	211	130	G 1/4"	350	446
80	225 (L)	261	155	G 1/4"	345	440
100	225 (L)	261	155	G 1/4"	345	440

T-Body Process Connection Options

The Type 2032 forged and block-machined bodies accommodate standard orbital welding dimensions conforming to ASME BPE, DIN EN ISO 1127 / ISO 4200 (Series B), DIN 11850-2 / DIN 11866 Series A, SMS 3008, and DIN 11850 Series 0.

For 312117 (Diaphragm size 20, main pipe run 50 mm / 2" branch): tube dimensions correspond to ASME BPE standard Port 1 ØD1 = 50.80 mm (wall s1 = 1.65 mm) and branch port ØD2 = 19.05 mm (wall s2 = 1.65 mm), with valve block body length A = 124.0 mm, dimension B = 30 mm, C = 82.20 mm, F = 111 mm, G = 66 mm, H = 37 mm, and I = 19.0 mm (product key SODI-SA93).

Clamp connections are also available according to DIN 32676 Series A (DIN pipe), DIN 32676 Series B (ISO pipe), and ASME BPE. Flange and clamp lengths must be factored into overall center-to-face line dimensions.

Maximum Medium Pressure Ratings (Control Function A)

Maximum permissible static process fluid pressures depend on diaphragm size, actuator diameter, pilot pressure, and seal polymer:

Diaphragm Size	Actuator Size ∅	Pilot Air Pressure [bar]	Max Static Fluid Pressure: EPDM, FKM [bar]	Max Static Fluid Pressure: PTFE, Advanced PTFE, GYLON® [bar]
8	40 (C)	5.0 to 7.0	10	10
15	50 (D)	5.0 to 7.0	10	—
15	63 (E)	5.0 to 7.0	10	10
20	63 (E)	5.5 to 7.0	10	10
20	80 (F)	5.0 to 7.0	10	10
25	80 (F)	5.5 to 7.0	10	10
40	100 (G)	5.5 to 7.0	10	9 (GYLON® max 6 bar)
40	125 (H)	5.5 to 7.0	10	10
50	125 (H)	5.5 to 7.0	10	10
65	175 (K)	5.0 to 6.0	10	6
80	175 (K)	5.0 to 6.0	7	4 (GYLON® only; 0 bar for EA/EU)
80	225 (L)	5.0 to 6.0	10	10
100	225 (L)	5.0 to 6.0	10	7

Operating Pressure Notice

Over-tightening bonnet bolts beyond recommended factory torques shortens diaphragm operating lifespan. Pressure specifications denote positive overpressure relative to atmosphere against a single closed seat.

Automation Accessories and System Integration

Electric Position Feedback Type 8697

The Type 8697 position feedback sensor integrates directly onto CLASSIC series actuators (diameter 40 to 225 mm). Features include mechanical or inductive limit switches for continuous end-position verification, high-visibility LED status indicators, an IP65/IP67 enclosure rating, and optional intrinsically safe ATEX/IECEx certifications.

Complete Valve System Type 8801-TA

Combining the Type 2032 T-diaphragm valve with the Type 8697 control head creates the Type 8801-TA automated valve system. Factory assemblies are pre-configured, mounted, and pressure-tested prior to shipment.