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 (PPS) and is suitable for use in demanding environments. It possesses a visual position indicator and can be optionally equipped with stroke limitation and locking.

Product Features

• High flow rates
• Long service life
• Robust actuator with optional stroke limitation and locking
• Flow-optimised stainless steel valve body with socket, clamp or welded connection

General 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 (ATEX/IECEx): Optional (variable code PX51). As a category 2 device suitable for zone 1/21 and zone 2/22. II 2G Ex h IIC T4...T2 Gb / II 2D Ex h IIIC T135 °C...T300 °C Db.
• Drinking Water: Suitable for use in drinking water applications. Materials comply with the assessment principles (UBA) for materials in contact with drinking water.
• Foods and Beverages/Hygiene:
  • FDA – Code of Federal Regulations (variable code PL02)
  • USP – United States Pharmacopeial Convention (variable code PL04)
  • EC Regulation 1935/2004 (variable code PL01, PL02)
  • China food GB Standards (variable code PL10)

ATEX Safety Warning

For devices with Ex approval (PX51), there is an explosion risk due to electrostatic charging. Ensure the actuator and valve body are grounded. Only wipe the device surfaces with a damp or anti-static cloth. Media with conductivity ≤100 pS/m may only be used if flow velocity is ≤1 m/s or dry running is prevented.

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	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...50: PEEK; DN 65...80: Stainless steel 1.4401/1.4404
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

Nominal connection size (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

Body with Welded Connection

Body with Clamp Connection

Performance Specifications

Fluidic data for flow below seat (Pipe threaded connection G, NPT, and RC)

DN	NPS	Seat size [mm]	Handwheel ∅	Kv value (water) [m³/h]	Max. Pressure PTFE [bar]	Max. Pressure PEEK [bar]
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

Operating Limits for Optional Variants

• 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 the assessment principles (UBA) for materials in contact with drinking water up to +85 °C.
• Low-temperature variant: Suitable for minimum medium temperatures down to -40 °C.

Function and Operation

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 (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.

Stroke Limit (Optional)

Setting the minimum and maximum stroke limit is possible as an option using an adjusting sleeve.

Lock Handwheel (Optional)

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.