BURKERT 20113252 (Type 2933) is a manually operated 2/2-way diaphragm valve engineered for ultra-pure, sterile, aggressive, or abrasive fluid isolation. Built with a forged 316L / 1.4435 BN2 stainless steel body, this configuration integrates an ASME BPE DN 40 (1 1/2") clamp port, a PTFE/EPDM backed diaphragm (size 40), and an autoclavable polyphenylene sulphide (PPS) bonnet and handwheel actuator. The flow-optimised, zero-deadleg interior profile achieves a water Kv value of 37.5 m³/h (Cv 43.7 gal/min) while supporting bidirectional shut-off up to 10 bar.

Equipped with an integrated visual position indicator and an adjustable closing limiter, the manual actuator protects sealing faces against over-tightening. All product-wetted stainless steel surfaces feature an electropolished internal finish with Ra ≤ 0.38 µm, certified to ASME BPE SF4 and DIN HE4 standards. Complete traceability is documented through an enclosed EN 10204 3.1 inspection certificate, while the sealing system conforms to USP Class VI, FDA 21 CFR 177, and EC Regulation 1935/2004 requirements for pharmaceutical, biotechnology, and food processing systems.

Technical Specifications

Technical Parameter	Specification / Measured Value
Article Number (Ident)	20113252
Valve Type / Concept	Type 2933 (Basic manual actuator)
Valve Function	2/2-way shut-off valve
Nominal Port Diameter	DN 40 (NPS 1 1/2")
Port Connection Type	Sanitary Tri-Clamp
Process Connection Standard	ASME BPE / BS 4825-3 (tube 38.1 x 1.65 mm, clamp collar 50.5 mm)
Valve Body Material	Forged stainless steel 316L / 1.4435 BN2 (VS)
Diaphragm Material	PTFE with EPDM backing diaphragm (code EA)
Diaphragm Size	40
Actuator Bonnet Material	Polyphenylene sulphide (PPS)
Handwheel Material / Size	PPS / Size M (110 mm diameter)
Operating Pressure Range	0 to 10 bar (PN 10 / Class 150)
Medium Temperature Range	-10 °C to +130 °C (steam sterilisation up to +140 °C for 60 min)
Ambient Temperature Range	-10 °C to +130 °C (short-term up to +150 °C; autoclavable)
Flow Capacity	Kv = 37.5 m³/h (Cv = 43.7 gal/min)
Internal Surface Finish	Ra ≤ 0.38 µm (NO17, ASME BPE SF4 / DIN HE4, electropolished)
Stroke Limitation	Adjustable single minimum-stroke limiter (closing limiter)
Stroke Scale / Positions	30 indexed rotation positions per handwheel turn
Position Feedback Preparation	M5 x 0.5 threaded sensor holes (proximity switches optional)
Cleaning Capabilities	CIP (Clean-in-Place) and SIP (Sterilise-in-Place) compliant
Included Certification	EN 10204 3.1 inspection certificate, 2.1 diaphragm certificate

Construction and Materials

Item No.	Element	Material Options / Current Configuration
1	Handwheel	Polyphenylene sulphide (PPS) [configured] or Stainless steel 1.4308
2	Visual position indicator	Polyamide (PA), Stainless steel 1.4305
3	Valve spindle	Stainless steel 1.4305
4	Diaphragm bonnet	Polyphenylene sulphide (PPS) [configured] or Stainless steel 1.4308
5	Diaphragm	PTFE/EPDM (EA) [configured], EPDM (AD), Adv. PTFE (EU), GYLON®/EPDM (ER)
6	Valve body	Forged 316L / 1.4435 BN2 (VS) [configured], cast (VG), tube (VP), plastic

Diaphragm Material Performance

• PTFE/EPDM (code EA): Medium range -10 °C to +130 °C. Steam sterilisation allowable up to +140 °C for 60 minutes.
• EPDM (code AD): Medium range -10 °C to +143 °C. Steam sterilisation allowable up to +150 °C for 60 minutes.
• Advanced PTFE/EPDM (code EU): Medium range -5 °C to +143 °C. Steam sterilisation allowable up to +150 °C for 60 minutes.
• Laminate of GYLON® and EPDM (code ER): Medium range -5 °C to +130 °C. Steam sterilisation allowable up to +140 °C for 60 minutes.

Dimensions and Port Connections

Manual Actuator Dimensions

Diaphragm Size	Handwheel Size	Handwheel ∅ B [mm]	Open Height H1 [mm]	Closed Height H2 [mm]	Slope per Rotation [mm]
6	T	35	49	42	1.5
8	T	35	54	49	1.5
15	S	45	84	78	1.75
20	S	45	95	86	1.75
25	S	45	101	90	1.75
32	M	110	129	115	2.0
40 (20113252)	M	110	134	116	2.0
50	M	110	149	125	2.0
65	H	240 / 272	182	152	4.0
80	H	240 / 272	205	163	4.0
100	H	240 / 272	207	161	4.0

Forged Body (VS) Clamp Connection Dimensions (ASME BPE)

Diaphragm Size	Port DN	Tube ∅ D1 [mm]	Wall s [mm]	Clamp ∅ D2 [mm]	Length L [mm]	h [mm]	H [mm]	Product Key	Variable Code
6	1/4"	6.35	0.89	25.0	63.5	8.5	18.0	TG50	—
6	3/8"	9.53	0.89	25.0	63.5	8.5	18.0	TG01	—
6	1/2"	12.7	1.65	25.0	63.5	8.5	18.0	TG02	—
8	1/4"	6.35	0.89	25.0	64.5	5.7	15.2	TG50	—
8	3/8"	9.53	0.89	25.0	89.0	5.7	15.2	TG01	AF34
8	1/2"	12.7	1.65	25.0	64.0 / 89.0	9.3	18.8	TG02	— / AF34
15	1/2"	12.7	1.65	25.0	89.0 / 108.0	8.15	19.85	TG02	— / AF34
15	3/4"	19.05	1.65	25.0	89.0	12.05	23.75	TG03	—
20	3/4"	19.05	1.65	25.0	102.0 / 117.0	16.0	30.3	TG03	— / AF34
25	1"	25.4	1.65	50.5	114.0 / 127.0	19.0	37.0	TG04	— / AF34
40 (20113252)	1 1/2"	38.1	1.65	50.5	140.0 / 159.0	27.6	52.4	TG05	— / AF34
50	2"	50.8	1.65	64.0	159.0 / 190.0	35.5	68.3	TG06	— / AF34
65	2 1/2"	63.5	1.65	77.5	249.0	43.0	83.5	TG07	—
80	2 1/2"	63.5	1.65	77.5	216.0	51.0	98.1	TG07	—
80	3"	76.2	1.65	91.0	222.0	51.0	98.1	TG08	—
100	4"	101.6	2.11	119.0	306.0	63.5	127.0	TG09	—

Performance and Tightening Torques

Flow Values for Forged Valve Bodies (VS)

Diaphragm Size	Port DN [mm]	Port Size [in]	ISO 1127/11866 B [m³/h]	DIN 11850 2 [m³/h]	ASME BPE [m³/h]	BS 4825 [m³/h]	SMS 3008 [m³/h]
6	8	1/4"	2.2	—	0.7	—	—
8	10	3/8"	1.5	1.5	1.6	1.4	—
15	15	1/2"	6.5	6.5	3.1	3.7	—
20	20	3/4"	12.5	12.4	8.4	8.9	—
25	25	1"	18.0	20.0	15.5	15.5	16.0
40	32	1 1/4"	—	34.0	—	—	—
40 (20113252)	40	1 1/2"	41.0	40.0	37.5	37.0	38.0
50	50	2"	66.0	66.0	66.0	66.0	66.0
65	65	2 1/2"	110.0	—	110.0	—	—
80	80	3"	160.0	160.0	160.0	—	—
100	100	4"	235.0	235.0	235.0	—	—

Handwheel Tightening Torque for Static and Dynamic Media Pressure

Diaphragm Size	Max. Pressure [bar]	Static Tightness: EPDM [Nm]	Static Tightness: PTFE [Nm]	Dynamic Tightness: EPDM [Nm]	Dynamic Tightness: PTFE [Nm]
6 / 8	10	0.6	1.1	0.9	1.2
15	10	0.8	1.7	1.5	2.5
20	10	0.9	3.0	2.0	4.5
25	10	1.2	3.5	3.6	5.0
32	10	2.5	4.0	8.0	15.0
40 (20113252)	10	4.5	7.0	12.0	15.0
50	10 (PPS: 7)	6.0	11.0	15.0	20.0
65	10	8.0	21.0 / 23.0	28.0	40.0
80	10	12.0	21.0 / 23.0	50.0	50.0
100	6	11.0 / 13.0	22.0 / 24.0	52.0	55.0

Sealing Definitions

• Static tightness: Valve is closed against static upstream pressure. At 7.0 Nm tightening torque for diaphragm size 40 (PTFE), the seat seals up to 10 bar with zero seat leakage.
• Dynamic tightness: Valve is closed against continuous flowing media. A torque of 15.0 Nm is required on diaphragm size 40 (PTFE) to achieve drop-tight shut-off across the seat.

Actuator Features and Operational Settings

Turning the handwheel counterclockwise lifts the internal spindle, opening the fluid path and progressively revealing the yellow optical indicator. On actuator sizes 15 to 50, the indicator carries an indexed stroke scale. The handwheel circumference incorporates 30 position marks, allowing repeatable intermediate flow throttles.

Setting the Minimum Stroke Limiter (Closing Limiter)

Type 2933 features an adjustable minimum stroke limiter housed inside the handwheel hub. This mechanism establishes a repeatable mechanical bottom stop, preventing diaphragm over-compression:

1. Rotate the handwheel clockwise until the valve reaches the fully closed position.
2. Loosen the retaining screw on the handwheel using a 2 mm hexagon socket wrench, then pull off the handwheel.
3. Screw down the internal hexagon nut until it stops firmly against the bonnet stop.
4. Align the spindle square and nut hexagon with the internal geometry of the handwheel, then reseat the handwheel.
5. Fasten the central handwheel screw to a torque of 0.9 Nm (thread locking adhesive may be applied if permanent setting is required).

Stroke Limit Range Restriction

The minimum stroke limit is intended solely for diaphragm protection in the 0% to 25% opening stroke range. Do not engage the nut threads along the drive square profile.

Sensor Preparation and Optional Accessories

The PPS bonnet includes two threaded bores for inductive proximity switch mounting. Switches detect the position of the internal compressor.

Accessory Description	Thread / Standard	Article Number
Inductive proximity switch (initiator) M5	M5 x 0.5	550412
Inductive proximity switch (initiator) M5 ATEX	M5 x 0.5 (Ex-certified)	904779
4-fold nylon locking mechanism with 3 mm bracket	Retrofit kit	93719475

Installation and Piping Guidelines

The valve mounts in any orientation, though installation with the actuator pointing vertically upward is preferred. When installed in sanitary process lines requiring complete drainability without media pooling, comply with the following criteria:

1. Pipeline Inclination: Set line inclination according to ASME BPE standards.
2. Self-Draining Angle: Align the forged body (VS) so that the marked alignment notch on the clamp collar points upwards.
3. Relief Bore Orientation: Ensure at least one relief bore in the PPS diaphragm bonnet faces the lowest gravitational point to provide early leakage detection.

Pressure Relief Prior to Work

Depressurise pipelines and vent all lines completely before loosening body clamp connections or bonnet bolts. Hot media or trapped line pressure may cause burns and fluid spray.

Body Fastener Tightening Torques

Diaphragm Size	Forged Body (VS) EPDM/FKM [Nm]	Forged Body (VS) PTFE/Adv. PTFE [Nm]	Tube Body (VP) EPDM/FKM [Nm]	Tube Body (VP) PTFE/Adv. PTFE [Nm]
8	2.0	2.5	2.0	2.5
15	3.5	4.0	3.5	4.0
20	4.0	4.5	4.0	4.5
25	5.0	6.0	7.0	8.0
32	6.0	8.0	8.0	10.0
40 (20113252)	8.0	10.0	12.0	15.0
50	12.0	15.0	15.0	20.0
65	20.0	30.0	20.0	30.0
80	30.0	40.0	30.0	40.0
100	40.0	40.0	—	—

Torque body screws crosswise in three progressive stages (approx. 1/3, 2/3, and 3/3 of final torque). A tolerance of +10% applies to all torque values.

Maintenance and Diaphragm Replacement

Under clean process operating conditions, the Type 2933 actuator is maintenance-free. Conduct routine visual inspections of the bonnet relief bore for fluid drops. Inspect the diaphragm after steam sterilisation or after a maximum of 100,000 operating cycles.

Diaphragm Fastening Methods by Size

Diaphragm Size	PTFE / Advanced PTFE (EA / EU)	EPDM / FKM / GYLON® (AD / FF / ER)
8	Buttoned connection	Buttoned connection
15 to 20	Bayonet catch	Bayonet catch
25 to 100 (incl. Size 40)	Bayonet catch	Threaded connection

Replacement Procedure for Article 20113252 (Size 40 PTFE/EPDM)

1. Open the valve fully by turning the handwheel counterclockwise.
2. Loosen the four body fastening bolts crosswise and separate the actuator and diaphragm from the forged valve body.
3. Turn the handwheel clockwise to the CLOSED position, driving the internal compressor forward.
4. Rotate the PTFE/EPDM diaphragm by 90° to disengage the bayonet catch pin from the compressor, then remove the diaphragm.
5. Insert the replacement PTFE/EPDM diaphragm tab into the compressor socket and lock it by rotating 90°.
6. Retract the compressor by turning the handwheel counterclockwise to the OPEN position.
7. Position the diaphragm so that its identification tab sits at a 90° angle to the pipeline flow direction.
8. Place the actuator assembly back onto the body, tighten bolts crosswise to 10.0 Nm in 3 stages, then cycle the handwheel twice to seat the elastomer.

Original Bürkert Spare Diaphragms for Size 40

Diaphragm Type	Material Code	Fastening Method	Article Number
PTFE / EPDM (EA)	EPDM E04 / PTFE P05	Bayonet catch	20093073
EPDM (AD)	EPDM E04	Threaded connection	688426
FKM (FF)	FKM F01	Threaded connection	677689
Advanced PTFE / EPDM (EU)	EPDM E04 / PTFE P06	Bayonet catch	20093084
GYLON® / EPDM laminate (ER)	PTFE L08	Threaded connection	693180

Explosion Protection Compliance (PX51)

When ordered with variable code PX51, Type 2933 complies with ATEX and IECEx standards for mechanical non-electrical equipment in Category 2G/2D zones:

• ATEX Certificate: EPS 18 ATEX 2 008 X
• ATEX Marking: II 2G Ex h IIC T4...T2 Gb / II 2D Ex h IIIC T135 °C...T300 °C Db
• IECEx Certificate: IECEx EPS 18.0007X (Ex h IIC T4...T2 Gb / Ex h IIIC T135 °C...T300 °C Db)

Temperature Classes and Permissible Limits (PX51)

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

Potential Electrostatic Charging Hazard

• Establish equipotential bonding by connecting the conductive stainless steel valve body directly to the pipeline grounding network.
• Media with conductivity ≤ 100 pS/m may only be transferred at velocities ≤ 1 m/s, or with system dry-run interlocks.
• Clean external plastic surfaces exclusively using a damp or antistatic cloth to prevent spark discharge in explosive atmospheres.