Burkert 20114631 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 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.

General 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)

Performance data
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

Medium data
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

Environment and installation
Environmental factors	Protect the device from electromagnetic interference, UV radiation and, when used outdoors, from weather conditions.
Ambient temperature	-10 °C...+60 °C
Installation position	As required, preferably with actuator upright

Approvals and Conformities

• Explosion protection (Optional): As a category 2 device suitable for zone 1/21 and zone 2/22. ATEX: II 2G Ex h IIC T4...T2 Gb / II 2D Ex h IIIC T135 °C...T300 °C Db. IECEx: Ex h IIC T4...T2 Gb / Ex h IIIC T135 °C...T300 °C Db.
• 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).
• Foods and beverages/Hygiene: FDA – Code of Federal Regulations, United States Pharmacopeial Convention (USP), EC Regulation 1935/2004, China food GB Standards.

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

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

(Dimensions in mm for DIN EN 1092 PN 25 FTF 1 according to DIN EN 558-1)

Performance Specifications

Fluidic Data

Overview of fluidic data for flow below seat (for liquids, steam and gases):

DN	NPS	Handwheel diameter ∅ [mm]	Operating pressure max. PTFE [bar(g)]	Operating pressure max. PEEK [bar(g)]	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 (20)	23 (20)	45
65	2 1/2	160 (L)	24 (15)	14	73
80	3	160 (L)	16	10	110
100	4	160 (L)	10	6	165

Operating Limits for Optional Variants

• High temperature variant: By adapting the packing gland this variant is suitable for applications with steam, neutral gases and other heat transfer mediums up to +230 °C.
• Water variant: For applications with water up to +200 °C; a special configuration of the packing gland increases the lifetime significantly. It is recommended for all water applications.
• Drinking water variant: The materials comply with the assessment principles (UBA) for materials in contact with drinking water up to +85 °C.
• Low temperature variant: Suitable for minimum medium temperatures down to -40 °C.

Function and Operation

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.

Set Stroke Limit

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

1. By turning the handwheel clockwise, the valve is moved to the closed position.
2. Loosen the screw on the handwheel and remove handwheel.
3. Screw adjusting sleeve clockwise until it comes to a stop. Minimum stroke is set.
4. Mount handwheel on actuator. Move the valve to the desired maximally open position.
5. Loosen the screw on the handwheel and remove the handwheel.
6. Pull adjusting sleeve upwards and at the same time, screw anticlockwise until it comes to a stop. Maximum stroke is set.
7. Mount handwheel on actuator and tighten the screw.

Lock Handwheel

It is also an option to lock the handwheel to prevent unintentional or unauthorised operation of the valve.

Push locking pin down and rotate by 180° (either clockwise or anticlockwise). The locking pin must lock into its end position so that the drill hole is fully visible once again. Insert padlock through the bore in the locking pin and secure.

Installation

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.

WARNING!

Risk of injury due to improper installation.

• Installation may be carried out by authorised technicians only and with the appropriate tools.
• Observe tightening torques.
• Do not reach into the openings of the valve body.

• 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.).

Troubleshooting

Fault	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