BURKERT 20094619 (Type 2921) is a manually operated 2/2-way globe valve configured for pure on/off shut-off duties across liquid, gaseous, and steam services. Built with a cast stainless steel 316L/CF3M straight-seat body, this configuration incorporates ASME BPE weld ends in DN 40 (NPS 1 1/2, pipe dimensions 38.1 x 1.65 mm), an internal seat diameter of 32 mm (1 1/4"), and a soft PTFE seat seal. The valve operates with medium flow directed underneath the seat (flow-to-open), shutting off against line pressure with leakage rate A conformity in accordance with DIN EN 12266-1.

Actuation is controlled manually by a 45 mm diameter (Size S) polyphenylene sulphide (PPS) handwheel operating a D10 spindle drive. Stem sealing uses a proven, self-adjusting PTFE V-ring gland assembly backed by spring compensation, providing consistent stem sealing during frequent manual cycling. An integrated optical indicator delivers visual confirmation of the open/closed position directly above the handwheel mechanism.

Technical Specifications

Parameter	Specification Details
Product Type	Type 2921 (2/2-way globe valve)
Article Number	20094619
Operating Mode	Manual on/off shut-off valve with swivel plate closure
Nominal Port Diameter	DN 40 (NPS 1 1/2)
Port Connection Size	Welded tube end 38.1 x 1.65 mm
Connection Standard	ASME BPE / DIN 11866 Series C / BS4825
Seat Diameter	32 mm (1 1/4")
Flow Coefficient Kv	19.5 m³/h (water measurement according to DIN EN 60534-2-4)
Flow Coefficient Cv	22.6 gpm
Operating Pressure Range	0 bar(g) to 25 bar(g)
Nominal Pressure Class	PN 25 (DIN EN 1333), Class 150 (DIN EN 1759)
Seat Leakage Class	Rate A according to DIN EN 12266-1 (air test medium)
Medium Temperature Range	-10 °C to +185 °C
Ambient Temperature Range	-10 °C to +60 °C
Max. Viscosity	600 mm²/s
Permitted Media	Steam, water, neutral gases, alcohols, oils, fuels, hydraulic fluids, saline solutions, lyes, organic solvents
Handwheel Diameter	45 mm (Size S)
Handwheel Material	Polyphenylene sulphide (PPS)
Handwheel Pitch	1.25 mm stroke advance per complete rotation
Spindle Interface	Spindle D10
Product Identification	Data Matrix Code on type label

Materials of Construction

Item No.	Element	Material
1	Cover	Polyamide (PA)
2	Screw	Stainless steel 1.4301 (304)
3	Locking device (optional)	Stainless steel 1.4305 (303)
4	Handwheel	Polyphenylene sulphide (PPS)
5	Visual position indicator with scale	Polyamide (PA)
6	Packing gland	Filled PTFE V-rings with spring compensation
7	Spindle	Stainless steel 1.4401 (316) / 1.4404 (316L)
8	Spindle guide	PEEK (for DN 15 to DN 50)
9	Housing seal	Graphite
10	Swivel plate	Stainless steel 1.4401 (316) / 1.4404 (316L)
11	Seat seal	PTFE (Polytetrafluoroethylene)
12	Valve seat with O-ring	Stainless steel 1.4571 (316Ti), EPDM
13	Valve body	Cast stainless steel 316L / CF3M

Dimensional Data

Actuator Dimensions

Actuator dimensions depend on the nominal pipe diameter and handwheel sizing. For DN 40 equipped with the 45 mm (Size S) PPS handwheel (Burkert article 20094619):

Nominal Port DN	Nominal Port NPS	Handwheel Ø [mm]	Height H1 [mm]	Height H2 with Lock [mm]
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

INFO

For article 20094619, the actuator handwheel diameter is 45 mm (Size S), giving an overall vertical height H1 of 301 mm (307 mm when fitted with the optional locking device).

Welded Body Dimensions (ASME BPE / DIN 11866 Series C)

Nominal Diameter NPS	Weld Length ES [mm]	Face-to-Face LS [mm]	Outer Tube Ø DS [mm]	Wall Thickness WS [mm]
1/2	20	90	12.7	1.65
3/4	20	90	19.05	1.65
1	20	100	25.4	1.65
1 1/2 (DN 40)	26	140	38.1	1.65
2 (DN 50)	26	150	50.8	1.65
2 1/2 (DN 65)	26	175	63.5	1.65
3 (DN 80)	26	210	76.2	1.65
4 (DN 100)	26	260	101.6	2.11

Pressure and Temperature Operating Limits

Maximum allowable working pressure derates as service temperature increases in line with flange and valve body design codes.

Pressure Derating per DIN EN 12516-1 (PN 25)

Medium Temperature [°C]	Permissible Working Pressure [bar]
-10 to +50	25.0
100	24.5
150	22.4
200	20.3
230	19.0

Pressure Derating per ASME B16.34 (Class 150)

Medium Temperature [°C]	Permissible Working Pressure [bar]
-29 to +38	19.0
50	18.4
100	16.2
150	14.8
200	13.7
230	12.7

Operating Pressure and Temperature Limits

Article 20094619 features a PTFE seat seal rated for medium temperatures between -10 °C and +185 °C. For applications above 130 °C, verify system pressure against the derating curves above. Operating pressures must never exceed 25 bar(g).

Installation and Actuator Assembly

Installation can take place in any orientation, preferably with the actuator upright. Before welding the valve body into the pipeline system, detach the actuator from the valve body to prevent heat transfer damage to internal seals.

Welded Body Installation Procedure

1. Rotate the handwheel counter-clockwise approximately two turns to lift the swivel plate off the valve seat.
2. Apply an open-end wrench to the body connection wrench flats and unscrew the actuator assembly from the valve body.
3. Weld the valve body into the pipe system, ensuring proper axial alignment and flush joint fit-up.
4. Clean and flush the line thoroughly to remove metal spatter, chips, and foreign debris before actuator reassembly.

Actuator Reassembly and Tightening Torques

1. Inspect the body connection seal (graphite ring) and replace it if damaged. Ensure no fragments enter the pipe interior.
2. Lightly grease the external threads of the body connection (Klüberpaste UH1 96-402 recommended).
3. Thread the actuator into the valve body by hand and tighten using an open-end wrench according to the torque schedule:

Nominal Diameter DN	Tightening Torque [Nm]	Tolerance [Nm]
10 / 15	45	±3
20	50	±3
25	60	±3
32	65	±3
40	65	±3
50	70	±3
65	100	±3
80	120	±5
100	150	±5

Pressure Hazard

De-energize pressure sources and drain or vent pipelines before conducting assembly, maintenance, or disassembly work. Do not reach into the valve body orifices during operation or testing.

Lubrication Restrictions

Use only lubricants compatible with the process media. In oxygen service, unsuitable grease creates an explosion hazard. Never use unapproved greases or pastes.

Handwheel Operation and Optional Features

Turn the handwheel counter-clockwise to open the valve; turn clockwise to close. Handwheel size S advances 1.25 mm of stroke per full 360° rotation. When opened, the yellow optical indicator becomes visible beneath the handwheel shell.

Stroke Limitation Setup (Optional Accessory)

Both minimum and maximum stroke positions can be limited via an internal adjusting sleeve:

1. Turn the handwheel clockwise until the valve is fully seated.
2. Loosen the handwheel socket screw (AF 2 mm) and remove the handwheel.
3. Screw the adjusting sleeve clockwise until it stops to set the minimum stroke.
4. Remount the handwheel, ensuring spindle square and adjusting sleeve hexagon align with the handwheel core.
5. Rotate to the target maximum open position, remove the handwheel again, pull the adjusting sleeve upward, and rotate it counter-clockwise to its stop.
6. Refit the handwheel and retighten the set screw to 0.9 Nm.

Handwheel Lockout (Optional Accessory)

Accidental or unauthorized operation can be prevented by depressing the locking pin and rotating it 180°. For handwheel size S, 12 locking positions are available per revolution (every 30° indexing equals 0.1 mm of stroke). The locking pin incorporates a 3.8 mm diameter hole to accommodate a security padlock or safety lockout tagout clasp (article 93719475).

Locking Pin Leakage Limitation

When the valve is locked in the closed position, leakage class A cannot be unconditionally guaranteed under all dynamic process conditions. Locking serves as an operational deterrent, not a positive mechanical mechanical stop.

Maintenance and Troubleshooting

Under normal service conditions with non-abrasive fluids, the Type 2921 manual actuator is maintenance-free. Conduct an annual visual inspection of the body connection, packing gland area, and relief bore.

Fault Observed	Probable Cause	Corrective Action
Valve does not seal tight at seat	Dirt or particulates lodged between seat and seal	Flush piping; install an upstream strainer/dirt trap
	PTFE seat seal worn or deformed	Replace closure member assembly
	Reverse flow direction	Re-align valve; flow must enter below the seat
	Working pressure exceeds allowable limit	Adjust operating pressure to match type label limits
Medium leaking from actuator relief bore	Spindle packing gland V-rings worn	Replace spindle packing gland set
Actuator loose on valve body	Thermal cycling or vibration loosening threads	Re-torque body connection to 65 ±3 Nm