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 Design 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

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
Ambient temperature	-10 °C...+60 °C
Installation position	As required, preferably with actuator upright

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

Approvals and Conformities

• Explosion protection (ATEX/IECEx): Optional category 2 device suitable for zone 1/21 and zone 2/22.
• Drinking water: Suitable for use in drinking water applications (UBA).
• Foods and beverages/Hygiene: FDA, USP, EC Regulation 1935/2004, China food GB Standards.

Performance Specifications

Fluidic Data

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

INFO

• Kv value [m³/h]: measurement with water according to DIN EN 60534-2-4
• Seat leakage leakage rate A according to DIN EN 12266-1

Nominal diameter (pipe) DN	NPS	Handwheel diameter ∅ [mm]	Operating pressure max. PTFE [bar(g)]	Operating pressure max. PEEK [bar(g)]	Kv value [m³/h]
10	3/4	45 (S)	25	25	4.7
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

In addition to the maximum operating pressures, the operating range of Bürkert process valves is limited by the nominal pressure according to the relevant standard.

• High temperature variant: 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.
• Drinking water variant: 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.

Installation and Operation

WARNING

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. The scale on the handwheel determines the rotation position of the handwheel (50 positions).

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.

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.