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.

Structure and Description

1. Handwheel with locking (optional)
2. Position indicator
3. Relief bore
4. Wrench flat for open-end wrench
5. Angle seat body
6. Port connection
7. Flow direction indicator

General Technical Data

Product properties
Design	Angle seat valve on/off
Nominal diameter	DN 10...DN 80, NPS 3/8...NPS 3
Flow direction	Flow to open (below seat)

Performance data
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

Medium data
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

Environment and installation
Ambient temperature	-10 °C...+60 °C
Installation position	As required, preferably with actuator upright

Approvals and Conformities

• Explosion protection: Optional (valid for variable code PX51). As a category 2 device suitable for zone 1/21 and zone 2/22 (ATEX / IECEx).
• Drinking water: Suitable for use in drinking water applications. Materials comply with UBA assessment principles. Stainless steel body PF39 is suitable for products with medium temperature up to 85 °C (hot water).
• 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

(Dimensions in mm, unless otherwise stated)

Nominal connection size (pipe) 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

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

Body with Welded Connection

Body with Clamp Connection

Performance Specifications

Operating Limits

In addition to the maximum operating pressures, the operating range of Burkert process valves is limited by the nominal pressure according to the relevant standard.

• High-temperature variant: Suitable for applications with steam, neutral gases and other heat transfer medium up to +230 °C.
• Water variant: For applications with water up to +200 °C, a special configuration of the packing gland increases service life significantly.
• Drinking water variant: Materials comply with UBA assessment principles for drinking water up to +85 °C.
• Low-temperature variant: Suitable for minimum medium temperatures down to -40 °C.

Installation and Operation

Risk of injury due to high pressure and escaping medium

Switch off the pressure before working on the device or system. Vent or drain the lines.

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).

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. Screw on handwheel
2. Square
3. Adjusting sleeve

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.

Push locking pin down and rotate by 180° (either clockwise or anticlockwise). Insert padlock through the bore in the locking pin and secure.