BURKERT 20136812 Type 2921 manually operated 2/2-way 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 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.

Product Features

• Compact design with a long service life.
• Robust actuator with optional stroke limitation and locking.
• Stainless steel valve body available with flange, socket, clamp, or welded connections.
• Visual position indicator integrated into the handwheel.

Technical Data

Product Properties	Specifications
Design	Globe valve on/off
Nominal diameter	DN 10...DN 100 (SKU 20136812 is DN 40)
Flow direction	Flow to open (below seat)
Operating pressure	0 bar(g)...25 bar(g) (SKU 20136812 is 0-16 bar)
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 20136812 is -10 °C to 185 °C)
Viscosity	Max. 600 mm²/s
Ambient temperature	-10 °C...+60 °C
Installation position	As required, preferably with actuator upright

Materials and Structure

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

No.	Element	Material
1	Cover	Polyamide (PA)
2	Screw	Stainless steel 1.4301
3	Locking device	Stainless steel 1.4305
4	Handwheel	Polyphenylene sulphide (PPS)
5	Visual 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 100: Stainless steel 1.4401 (316)/1.4404 (316L)
9	Housing seal	Graphite
10	Swivel plate	Stainless steel 1.4401 (316)/1.4404 (316L)
11	Seat seal	PTFE or PEEK
12	Valve seat with O-ring	Stainless steel 1.4571, EPDM
13	Valve body	Stainless steel 316L/CF3M

Approvals and Conformities

• Explosion Protection (Optional): ATEX / IECEx Category 2 device suitable for zone 1/21 and zone 2/22 (Ex h IIC T4...T2 Gb / Ex h IIIC T135 °C...T300 °C Db).
• Drinking Water: Suitable for use in drinking water applications. Materials comply with UBA assessment principles.
• Foods and Beverages / Hygiene: FDA, USP, EC Regulation 1935/2004, and China food GB Standards compliant variants available.

Installation and Operation

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.

Position Indicator

When turning the handwheel anticlockwise, the reproducible stroke scale becomes visible between the position indicator and the handwheel.

NOTICE

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 and Locking (Optional)

• Stroke limitation: Both the minimum and the maximum position of the valve can be adjusted via an adjustment sleeve. The handwheel can be removed for this purpose.
• Interlock: The valve can be secured against unintentional or unauthorized operation. A securing pin can be pressed down and turned. The locking pin has a hole (Ø 3.8) and can be secured with a padlock.