Burkert 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
• Long service life
• Robust actuator with optional stroke limitation and locking
• Stainless steel valve body with socket, clamp or welded connection

Structure and Description

Component	Description
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

Technical Data

Product properties
Design	Globe valve on/off
Nominal diameter	DN 10...DN 100, NPS 3/8...NPS 4
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
Kv value	0.1 m³/h...140 m³/h
Operating medium	Steam, water, neutral gases, alcohols, oils, fuels, hydraulic fluids, salt solutions, alkalis, organic solvents
Medium temperature	-40 °C...+230 °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

Approval	Description
ATEX / IECEx	Optional: Explosion protection (valid for the variable code PX51). As a category 2 device suitable for zone 1/21 and zone 2/22. ATEX: EPS 18 ATEX 2 008 XII 2G Ex h IIC T4...T2 Gb / II 2D Ex h IIIC T135 °C...T300 °C Db IECEx: IECEx EPS 18.0007X Ex h IIC T4...T2 Gb / Ex h IIIC T135 °C...T300 °C Db

Drinking Water and Hygiene

Conformity	Description
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). Stainless steel body PF39: Suitable for products with medium temperature up to 85 °C (hot water).
FDA	FDA – Code of Federal Regulations (valid for the variable code PL02, PL03). All wetted materials are compliant with the Code of Federal Regulations published by the FDA.
USP	United States Pharmacopeial Convention (USP) (valid for the variable code PL04). All wetted materials are biocompatible.
EC 1935/2004	EC Regulation 1935/2004 of the European Parliament and of the Council (valid for the variable code PL01, PL02).
China GB	China food GB Standards of the People's Republic of China (valid for the variable code PL10).

Materials

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

Dimensions

Actuator

Dimensions in mm, unless otherwise stated.

Nominal connection size (pipe)	Handwheel diameter ∅	H1	H2 (locking)
DN 15 (NPS 1/2)	45 (S)	217	224
DN 20 (NPS 3/4)	45 (S)	224	230
DN 25 (NPS 1)	45 (S)	228	234
DN 32 (NPS 1 1/4)	45 (S)	296	303
DN 40 (NPS 1 1/2)	45 (S) / 110 (M)	301	307
DN 50 (NPS 2)	110 (M)	307	313
DN 65 (NPS 2 1/2)	160 (L)	361	368
DN 80 (NPS 3)	160 (L)	369	375
DN 100 (NPS 4)	160 (L)	379	385

Body with Flange Connection

DN	∅ DF	LF	∅ BF	AF	∅ D	A x α	∅ MF
15	95	130	65	16	14	4 x 90°	18.1
20	105	150	75	18	14	4 x 90°	23.7
25	115	160	85	18	14	4 x 90°	29.7
32	140	180	100	18	18	4 x 90°	38.4
40	150	200	110	18	18	4 x 90°	44.3
50	165	230	125	20	18	4 x 90°	56.3
65	185	290	145	22	18	8 x 45°	66.0
80	200	310	160	24	18	8 x 45°	81.0
100	235	350	190	24	22	8 x 45°	100.0

(Table shows DIN EN 1092 PN 25 FTF 1 according to DIN EN 558-1)

Body with Threaded Connection

DN	NPS	D (G)	E (NPT)	E (Rc)	LM	AF
15	1/2	14	13.7	13.2	65	27
20	3/4	16	14	14.5	75	34
25	1	18	16.8	16.8	90	41
32	1 1/4	20	17.3	19.1	110	50
40	1 1/2	22	17.3	19.1	120	55
50	2	24	17.6	23.4	150	70

Body with Welded Connection

Body with Clamp Connection

Performance Specifications

Fluidic Data

DN	NPS	Handwheel ∅ [mm]	Max Pressure PTFE [bar]	Max Pressure PEEK [bar]	Kv value [m³/h]
15	1/2	45 (S)	25	25	4.7
20	3/4	45 (S)	25	25	8.1
25	1	45 (S)	25	25	13.0
32	1 1/4	45 (S)	25	25	20
40	1 1/2	45 (S) / 110 (M)	25	25	31
50	2	110 (M)	25	23	45
65	2 1/2	160 (L)	24	14	73
80	3	160 (L)	16	10	110
100	4	160 (L)	10	6	165

Operating Limits (Derating)

Derating the operating pressure as per DIN EN 12516-1/PN25

Temperature [°C]	Operating pressure [bar]
-10...+50	25
100	24.5
150	22.4
200	20.3
230	19

Function

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).

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 Characteristic

Installation and Maintenance

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.

DANGER

Explosion risk due to electrostatic charging (ATEX/IECEx) If the device or personnel discharge suddenly, there is a risk of explosion in potentially explosive areas.

• Take appropriate measures to ensure that no electrostatic charge can build up in the potentially explosive area.
• Only clean the device surface by wiping it gently with a damp or antistatic cloth.
• Ground the actuator and the valve body.

Set Stroke Limit

Setting the minimum and maximum stroke limit is possible as an option. An adjusting sleeve is used for this purpose. The handwheel can be removed to adjust the sleeve.

Lock Handwheel

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.