BURKERT 20128861 Type 2921 globe valve consists of a manual actuator and a 2-way body made of stainless steel. With a high-quality 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 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.

Product Features

• Compact design: Space-saving installation.
• Long service life: Robust actuator and self-adjusting packing gland.
• High-quality materials: Stainless steel valve body with a welded connection.
• Visual position indicator: Standard optical position indicator for easy monitoring.

Technical Data

Property	Value
Design	Globe valve on/off
Nominal diameter	DN 25 (NPS 1)
Flow direction	Flow to open (below seat)
Operating pressure	0 bar(g) to 25 bar(g)
Nominal pressure	PN 25 (DIN EN 1333), Class 150 (DIN EN 1759)
Seat leakage	Leakage rate A (DIN EN 12266-1), test medium air
Kv value (water)	13 m³/h
Medium temperature	-10 °C to +185 °C
Ambient temperature	-10 °C to +60 °C
Port connection	Welded (DIN EN ISO 1127 / ISO 4200 / DIN 11866 Series B)

Approvals and Conformities

• Pressure Equipment Directive: 2014/68/EU
• Foods and beverages/Hygiene: FDA (Code of Federal Regulations) and EC Regulation 1935/2004 compliant according to Manufacturer Declaration.

Materials

No.	Element	Material
1	Cover	Polyamide (PA)
4	Handwheel	Polyphenylene sulphide (PPS)
5	Visual position indicator	Polyamide (PA)
6	Packing gland	PTFE V-rings (filled), with spring compensation
7	Spindle	Stainless steel 1.4401 (316)/1.4404 (316L)
11	Seat seal	PTFE
13	Valve body	Stainless steel 316L/CF3M

Dimensions

Actuator

For the DN 25 model, the handwheel diameter is 45 mm (Size S).

• H1: 228 mm
• H2 (locking): 234 mm

Body with Welded Connection

Dimensions in mm, unless otherwise stated.

Nominal diameter (pipe)	ES	LS	EN ISO 1127-1 / ISO 4200 / DIN 11866 series B
DN 25	26	130	∅ DS: 33.7, WS: 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.

Note on Stroke Scale

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 (Optional)

Setting the minimum and maximum stroke limit is possible as an option. An adjusting sleeve is used for this purpose.

Lock Handwheel (Optional)

It is also an option to lock the handwheel to prevent unintentional or unauthorised operation of the valve. Handwheel size S can be locked in 12 locking positions per revolution (every 30° corresponds to 0.1 mm of stroke).

Leakage Class Limitation

The leakage class specified in the technical data cannot be guaranteed when the valve is locked in the closed position, depending on the operating and application conditions.

Installation Notes

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.

• 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.).
• For devices with a welded connection, remove the actuator from the valve body before welding to prevent damage to the seals.