BURKERT Type 2920 (SKU 20110610) is a manually operated 2/2-way angle seat valve consisting 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 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 under challenging operating conditions.

The actuator is made of high-quality plastic (Polyphenylene sulfide) 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 Variants

The product family includes Types 2920, 2921, 2960, and 2961, which differ by valve body design and the presence of a 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 to set a defined flow rate; with screwed-in valve seat that can be replaced to reduce the seat size

General Technical Data

Property	Value
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
Ambient temperature	-10 °C...+60 °C
Viscosity	Max. 600 mm²/s
Installation position	As required, preferably with actuator upright

Material Specifications

Element	Material
Cover	Polyamide (PA)
Screw	Stainless steel 1.4301
Lock pin	Stainless steel 1.4305
Handwheel	Polyphenylene sulfide (PPS)
Optical position indicator	Polyamide (PA)
Packing gland	PTFE V-rings (filled), with spring compensation
Spindle	Stainless steel 1.4401 (316)/1.4404 (316L)
Spindle guide	DN 15...DN 50: PEEK; DN 65...DN 80: Stainless steel 1.4401 (316)/1.4404 (316L)
Body seal	Graphite
Swivel plate	Stainless steel 1.4401 (316)/1.4404 (316L)
Seat seal	PTFE or PEEK
Valve body	Stainless steel 316L/CF3M

Approvals and Conformities

• Pressure Equipment Directive: 2014/68/EU.
• Explosion Protection (Optional): ATEX (EPS 18 ATEX 2 008 XII 2G Ex h IIC T4...T2 Gb / II 2D Ex h IIIC T135 °C...T300 °C Db) and IECEx (IECEx EPS 18.0007X). Suitable for zone 1/21 and zone 2/22 as a category 2 device.
• Drinking Water: Suitable for use in drinking water applications. Materials comply with the assessment principles (UBA) for materials in contact with drinking water (TrinkwasserV).
• Foods and Beverages/Hygiene: FDA Code of Federal Regulations, United States Pharmacopeial Convention (USP), EC Regulation 1935/2004, and China food GB Standards.

Function and Features

By manually overriding the handwheel, the force is transmitted via a spindle and the valve is opened or closed. Turning the handwheel anticlockwise opens the valve, turning it clockwise closes it.

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 the relative position of the valve (valve opening) and acts as a fixation point for determining the rotation position.

INFO

The visibility of the stroke scale is not directly correlated with the closed position of the valve. Depending on the valve design, the repeatable stroke scale may not be visible when the valve is open, or be visible when the valve is closed.

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 Limitation (Optional)

Setting the minimum and maximum stroke limit is possible as an option. An adjusting sleeve is used for this purpose. Both the minimum and the maximum position of the valve can be adjusted via an adjustment sleeve after removing the handwheel.

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.

Installation and Maintenance

WARNING

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 crushing by mechanically powered parts Do not reach into the openings of the valve body.

When used in accordance with the operating instructions, the actuator of the manually operated valve is maintenance-free. Perform a visual inspection of the device once per year. If leaks occur, replace the respective wearing part. Muddy and abrasive media require correspondingly shorter inspection intervals.

Troubleshooting

Troubleshooting	Cause	Elimination
Valve is not tight	Dirt between seal and valve seat	Install dirt trap
	Valve seat seal worn	Install new control cone
	Flow direction interchanged	Observe the marking for the flow direction on the valve body
	Operating pressure too high	Observe pressure specifications on the type label
Valve is leaking on the relief bore	Packing gland worn	Replacing packing gland