BURKERT 20120446 Type 2920 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 therefore enables low-maintenance operation, even at high switching cycles.

The actuator is made of high-quality plastic (PPS) and is suitable for use in demanding environments. It possesses a visual position indicator and features a 110 mm handwheel. Depending on the application, the soft PTFE seal ensures a reliable valve seat seal, even under challenging operating conditions.

Technical Data

Product Properties	Specification
Design	Angle seat valve on/off
Nominal diameter	DN 40 (NPS 1 1/2)
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), test medium air
Kv value	35 m³/h
Operating medium	Steam, water, neutral gases, alcohols, oils, fuels, hydraulic fluids, salt solutions, alkalis, organic solvents
Medium temperature	-10 °C...+185 °C
Viscosity	Max. 600 mm²/s
Port connection	Clamp (DIN 32676 series A)
Ambient temperature	-10 °C...+60 °C
Installation position	As required, preferably with actuator upright

Approvals and Conformities

This model is compliant with FDA (Code of Federal Regulations) and EC Regulation 1935/2004 for food and beverage hygiene applications.

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	PEEK
9	Body seal	Graphite
10	Swivel plate	Stainless steel 1.4401 (316)/1.4404 (316L)
11	Seat seal	PTFE
12	Valve body	Stainless steel 316L/CF3M

Dimensions (Clamp Connection)

Dimensions in mm, unless otherwise stated.

Nominal diameter (pipe)	Clamp: DIN 32676 series A (Pipe: DIN 11850-2 / DIN 11866 series A)
DN	40
LC	200
CC	69.5
∅ D1 C	50.5
∅ D2 C	41
SC	1.5

Performance Specifications

Fluidic data for flow below seat (Clamp connection according to ASME BPE / DIN 11866 Series C)

Nominal diameter (pipe connection)	Seat size	Handwheel diameter ∅	Kv value water	Operating pressure max. (PTFE)
DN 40 (NPS 1 1/2)	40 mm	110 mm (M)	35 m³/h	25 bar(g)

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 (flow to open).