BURKERT Type 2920 angle seat valve consists of a manual actuator and a 2-way body made of high-quality stainless steel. With a flow-optimised valve body, the manually operated valve offers diverse usage options to shut off both neutral and aggressive gaseous and liquid media. The tried-and-tested self-adjusting packing gland guarantees optimal tightness and therefore enables low-maintenance operation, even at high switching cycles. Depending on the application, the soft PTFE or PEEK seal ensures a reliable valve seat seal, even under challenging operating conditions.

The actuator is made of high-quality plastic and is suitable for use in demanding environments. It possesses a visual position indicator and can be optionally equipped with stroke limitation and locking.

Variants

The Type 2920 family includes several variants differing by valve body and control cone:

Type	Nominal diameter DN	Valve body	Properties
2920	10 to 80	Angle seat body	Without control cones; for pure shut-off function
2960	10 to 65	Angle seat body	With control cone; with position indicator and scale to set a defined flow rate
2921	10 to 100	Globe body	Without control cones; for pure shut-off function
2961	10 to 100	Globe body	With control cone; with position indicator and scale; replaceable valve seat

Technical Data

Product properties	Specifications
Design	Angle seat valve on/off
Nominal diameter	DN 10...DN 80, NPS 3/8...NPS 3
Flow direction	Flow to open (below seat)
Operating pressure	0 bar(g)...25 bar(g)
Nominal pressure	PN 25 (DIN EN 1333), Class 150 (DIN EN 1759)
Seat leakage	Leakage rate A (DIN EN 12266-1), seat seal PTFE and PEEK, test medium air
Kv value	1.6...140 m³/h
Operating medium	Steam, water, neutral gases, alcohols, oils, fuels, hydraulic fluids, salt solutions, alkalis, organic solvents
Medium temperature	-40 °C...+230 °C
Viscosity	Max. 600 mm²/s
Ambient temperature	-10 °C...+60 °C
Installation position	As required, preferably with actuator upright

Approvals and Conformities

• Explosion Protection (Optional): ATEX (II 2G Ex h IIC T4...T2 Gb / II 2D Ex h IIIC T135 °C...T300 °C Db) and IECEx. Suitable for zone 1/21 and zone 2/22.
• Drinking Water: Suitable for use in drinking water applications. Materials comply with UBA assessment principles (TrinkwasserV). PF39 suitable for hot water up to 85 °C.
• Foods and Beverages/Hygiene: FDA (Code of Federal Regulations), USP (United States Pharmacopeial Convention), EC Regulation 1935/2004, and China food GB Standards compliant variants available.

Materials

No.	Element	Material
1	Cover	Polyamide (PA)
2	Screw	Stainless steel 1.4301
3	Lock pin	Stainless steel 1.4305
4	Handwheel	Polyphenylene sulfide (PPS)
5	Optical position indicator with scale	Polyamide (PA)
6	Packing gland	PTFE V-rings (filled), with spring compensation
7	Spindle	Stainless steel 1.4401 (316)/1.4404 (316L)
8	Spindle guide	DN 15...DN 50: PEEK DN 65...DN 80: Stainless steel 1.4401 (316)/1.4404 (316L)
9	Body seal	Graphite
10	Swivel plate	Stainless steel 1.4401 (316)/1.4404 (316L)
11	Seat seal (optional)	PTFE or PEEK
12	Valve body	Stainless steel 316L/CF3M

Dimensions

Actuator

DN	NPS	Handwheel diameter ∅ [mm]	B1	H1
15	1/2	45 (S)	148	148
20	3/4	45 (S)	154	154
25	1	45 (S)	163	163
32	1 1/4	45 (S)	171	171
40	1 1/2	45 (S), 110 (M)	224	224
50	2	110 (M)	241	241
65	2 1/2	160 (L)	290	290
80	3	160 (L)	308	310

Body with Threaded Connection

DN	NPS	D (G)	D (NPT)	D (Rc)	E	CM	LM	SW
15	1/2	14	13.7	13.2	24	65	27	27
20	3/4	16	14.0	14.5	27	75	34	34
25	1	18	16.8	16.8	29.5	90	41	41
32	1 1/4	16	17.3	19.1	36	110	50	50
40	1 1/2	18	17.3	19.1	35	120	55	55
50	2	24	17.6	23.4	45	150	70	70
65	2 1/2	26	23.7	26.7	57	185	85	85
80	3	28	-	-	71	220	100	100

Body with Welded Connection (DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B)

DN	ES	CS	LS	∅ DS	WS
15	19	34	100	21.3	1.6
20	20	39	115	26.9	1.6
25	26	43	130	33.7	2.0
32	26	45	145	42.4	2.0
40	26	49	160	48.3	2.0
50	26	50	175	60.3	2.0
65	26	50	210	76.1	2.3
80	26	88.5	266	88.9	2.3

Performance Specifications

Fluidic Data (Pipe threaded connection G, NPT, and RC)

DN	NPS	Seat size [mm]	Handwheel ∅	Kv value (water) [m³/h]	Max. Pressure PTFE [bar(g)]	Max. Pressure PEEK [bar(g)]
8	1/4	15	45 (S)	2.6	25	25
10	3/8	15	45 (S)	5.4	25	25
15	1/2	15	45 (S)	5.4	25	25
20	3/4	20	45 (S)	11	25	25
25	1	25	45 (S)	20	25	25
32	1 1/4	32	45 (S)	30	25	25
40	1 1/2	40	45 (S)	40	16	12.8
40	1 1/2	40	110 (M)	40	25	25
50	2	50	110 (M)	55	25	20
65	2 1/2	65	160 (L)	91	24	19
80	3	80	160 (L)	140	16	12.8

Operation and Installation

Position Indicator

When turning the handwheel anticlockwise, the reproducible stroke scale becomes visible between the position indicator and the handwheel. The scale on the handwheel determines the rotation position of the handwheel (50 positions). The reproducible stroke scale shows, depending on the bottom edge of the handwheel, the relative position of the valve (valve opening) and acts as a fixation point for determining the rotation position.

Flow Direction

The valve seat is always closed against the medium flow. The flow direction should therefore be set such that the valve reaches the flow beneath the valve seat.

Set Stroke Limit

Setting the minimum and maximum stroke limit is possible as an option. 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 and remove handwheel.
3. Screw adjusting sleeve clockwise until it comes to a stop. Minimum stroke is set.
4. Mount handwheel on actuator. Move the valve to the desired maximally open position.
5. Loosen the screw on the handwheel and remove the handwheel.
6. Pull adjusting sleeve upwards and at the same time, screw anticlockwise until it comes to a stop. Maximum stroke is set.

Lock Handwheel

It is also an option to lock the handwheel to prevent unintentional or unauthorised operation of the valve.

The locking pin has a bore (Ø 3.8) and can be secured against unauthorised use with a padlock (not included in scope of delivery). Push locking pin down and rotate by 180° (either clockwise or anticlockwise). Insert padlock through the bore in the locking pin and secure.

Explosion Risk due to Electrostatic Charge

If the device has an Ex approval (e.g., PX51), there is a risk of explosion in potentially explosive atmospheres if a sudden discharge of electrostatically charged devices or individuals occurs.

• Take appropriate measures to ensure that no electrostatic charge can build up in the Ex area.
• Only clean the device surfaces by wiping gently with a damp or antistatic cloth.
• Ground the actuator and the valve body.
• If a plastic valve body is used, ground the actuator separately.