Burkert Type 2920 (SKU 20137397) manually operated 2/2-way 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.

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)
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
Operating medium	Steam, water, neutral gases, alcohols, oils, fuels, hydraulic fluids, salt solutions, alkalis, organic solvents
Medium temperature	-40 °C...+230 °C (SKU 20137397 specific: -10 °C to 185 °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 (valid for the 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. The materials comply with the assessment principles (UBA) for materials in contact with drinking water (TrinkwasserV).
• Foods and beverages/Hygiene: FDA, USP, EC Regulation 1935/2004, and China food GB Standards compliant variants available.

Note

The ambient and medium temperature range may be limited by non-ex-relevant specifications. Observe the Operating Instructions.

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

Note: Dimensions in mm, unless otherwise stated.

Body with Welded Connection

Nominal diameter (pipe)	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

Product Design and Assembly

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.

Installation and Safety

DANGER!

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.

WARNING!

Risk of injury due to improper installation Installation may be carried out by authorised technicians only and with the appropriate tools. Observe tightening torques.

• Note the installation position. The device can be installed in any manner, preferably with the actuator facing upwards.
• Ensure pipelines are aligned before connection.
• Note the flow direction. The flow direction is visible on the valve body and on the type label.
• Clear impurities from pipelines (seal material, metal chips, etc.).