BURKERT 20132946 (Type 2973) is a manually operated diaphragm valve consisting of a manually operated actuator, a diaphragm, and a 2-way body. The manual actuator with a plastic handwheel ensures use in hygienic or aggressive ambient conditions. The flow-optimized valve body with minimum dead space enables high flow values and a wide range of possible applications.

The valve body and the diaphragms are available in all common materials and variants. The actuator has a compact, autoclavable design and is compatible with all other Bürkert diaphragm valves. The manual actuator possesses a visual position indicator with a reproducible stroke scale, as well as an adjustable minimum and maximum stroke limitation and/or locking.

General Technical Data

Product properties	Specifications
Plastic valve body (PW, PV, PP, PD)	PVC-C, PVC-U, PP, PVDF
Diaphragm	EPDM (AD), PTFE/EPDM (EA), Advanced PTFE/EPDM (EU), laminate of GYLON® and EPDM (ER)
Actuator	Stainless steel/PPS
Diaphragm size	15...50
Operating medium	Neutral gases and liquids, highly purified, sterile, aggressive or abrasive mediums
Medium temperature (PTFE/EPDM)	-10...+130 °C (steam sterilisation +140 °C for 60 min)
Ambient temperature	-10...+130 °C (short-term up to +150 °C), autoclavable

Approvals and Conformities

• FDA: The diaphragms made of EPDM, PTFE/EPDM, Advanced PTFE/EPDM and laminate of GYLON® and EPDM comply with the Code of Federal Regulations published by the FDA.
• USP: The diaphragms are tested according to USP Class VI.
• EC Regulation 1935/2004: Suitable for use with food and beverages.
• Explosion Protection (Optional): EPS 18 ATEX 2 008 X II 2G Ex h IIC T4…T2 Gb / II 2D Ex h IIIC T135 °C…T300 °C Db. IECEx EPS 18.0007X.

Materials

No.	Element	Material
1	Lock pin	Stainless steel 1.4305
2	Screw	Stainless steel A2
3	Handwheel cover	Polyamide (PA)
4	Handwheel	Polyphenylene sulphide (PPS)
5	Visual position indicator	Polyamide (PA)
6	Valve spindle	Stainless steel 1.4305
7	Diaphragm socket	Stainless steel 1.4308
8	Diaphragm	EPDM, PTFE/EPDM, Advanced PTFE/EPDM, GYLON®/EPDM
9	Valve body	PVC-C, PVC-U, PP, PVDF

Dimensions

Manual Actuator

Diaphragm size	H1	H2	H3	H4	∅ B
15	127	133	121	127	45
20	138	144	129	135	45
25	143	149	133	139	45
32	177	183	163	169	110
40	182	188	164	170	110
50	197	203	173	179	110

Plastic Valve Body (PV, PP, PD) with Spigot Connection

INFO

The specified values refer to the new plastic body. The previous bodies (REV1) may differ slightly from the new dimensions.

Diaphragm size	A	L1	L2	∅ d	s	h	H
PVC-U (PV)
15	25	124	16	20	2.5	12	29
20	25	144	19	25	2.5	17	36
25	25	154	22	32	3.5	19	43
32	45	174	26	40	4	25	52.5
40	45	194	31	50	5	28.6	65.5
50	45	224	44	63	6.5	35.5	79

Performance Specifications

Flow Characteristics (Plastic Valve Body)

Diaphragm size	Seal material	Port connection [mm]	Port connection [inch]	Kv value water [m3/h]
15	PTFE	15	1/2	7.5
20	PTFE	20	3/4	13.1
25	PTFE	25	1	21.5
32	PTFE	32	1 1/4	37.5
40	PTFE	40	1 1/2	56
50	PTFE	50	2	92

Medium Pressure

Diaphragm size	Maximum static operating pressure [bar]	Tightening torque for PTFE/EPDM [Nm]
15	10	1.7
20	10	3
25	10	3.5
32	10	4
40	10	7
50	10	11

Pressure Temperature Diagram for Plastic Body

WARNING

This information is important for material selection. Observe the permissible operating pressure depending on the medium temperature.

Installation and Operation

Setting Minimum and Maximum Stroke Limits

A minimum and maximum stroke limit can be set for Type 2973 (diaphragm sizes 15…50). The stroke limit is available as an option and is not integrated as standard. An adjusting sleeve is used for this purpose.

1. By turning the handwheel clockwise, the valve is moved to the closed position.
2. Loosen the screw on the handwheel (hexagon socket, width across flats 2) and remove the handwheel.
3. Screw the adjusting sleeve clockwise until it comes to a stop. Minimum stroke is set.
4. Mount the handwheel on the actuator. The square on the spindle and the hexagon head of the adjusting sleeve must be correctly aligned.
5. Move the valve to the desired maximally open position.
6. Loosen the screw on the handwheel and remove the handwheel.
7. Pull the adjusting sleeve upwards and at the same time, screw anticlockwise until it comes to a stop. Maximum stroke is set.
8. Mount the handwheel on the actuator and tighten the screw with 0.9 Nm.

Locking the Handwheel

A locking mechanism is available as an option to prevent accidental or unauthorised operation. The locking pin has a bore (Ø 3.8) and can be secured against unauthorised use with a padlock.

1. Push the locking pin down and rotate by 180° (either clockwise or anticlockwise).
2. The locking pin must lock into its end position so that the bore is fully visible once again.
3. Insert a padlock through the bore in the locking pin and secure it.