BURKERT Type 2000 (article 344576) is an externally piloted 2/2-way CLASSIC angle seat valve engineered for shut-off applications involving steam and gaseous media. Configured with control function A (normally closed by spring force in the rest position) and flow direction above the seat (flow-to-close), the valve utilizes process line pressure acting over the swivel plate to actively assist the actuator spring in tight seat sealing. The valve body features a DN 32 welded connection compliant with ISO 4200, DIN EN ISO 1127, and DIN 11866 Series B (pipe dimensions 42.4 mm outer diameter × 2.0 mm wall thickness), paired with an 80 mm diameter (size 63 / E) polyamide (PA) pneumatic piston actuator.

The investment-cast valve body is manufactured from CF3M (316L) stainless steel and fitted with a virgin PTFE seat seal, delivering a nominal flow coefficient Kv of 29 m³/h for water. Operating pressure spans 0 bar(g) to 16 bar(g), supported by a nominal pressure rating of PN 25 (DIN EN 1333) and Class 150 (DIN EN 1759). Spindle sealing is achieved through a self-adjusting PTFE V-ring packing gland with spring compensation, providing maintenance-free stem containment across medium temperatures from -10 °C to +185 °C. The valve assembly is suitable for clean-in-place (CIP) and sterilization-in-place (SIP) processes.

Operating Principle and Flow Direction

Type 2000 article 344576 operates via pneumatic pilot pressure admitted through the lower actuator port to overcome internal spring force, lifting the spindle and swivel plate off the valve seat.

In control function A with flow above the seat, media enters above the swivel plate. This configuration ensures that line pressure supplements spring force during closure, enhancing seat shut-off tightness against higher line pressures.

Restriction to Compressible Media (Gases and Steam)

Valves with flow direction above the seat must only be used for gaseous media and steam. Liquid media must never be fed through a valve with flow above the seat because rapid closure against incompressible flow produces severe water hammer, leading to fractured pipework and catastrophic valve failure.

Technical Data

Parameter	Technical Value
Article Number	344576
Valve Type	2000 CLASSIC
Nominal Diameter (DN)	DN 32
Nominal Seat Diameter	32 mm
Flow Coefficient Kv (Water)	29 m³/h
Control Function	CF A (Normally closed by spring force)
Flow Direction	Flow above seat (flow-to-close)
Port Connection	Welded ends: ISO 4200 / DIN EN ISO 1127 / DIN 11866 Series B
Pipe Dimensions	Outer diameter 42.4 mm, wall thickness 2.0 mm, inner diameter 38.4 mm
Nominal Pressure Class	PN 25 (DIN EN 1333) / Class 150 (DIN EN 1759)
Operating Pressure Range	0 to 16 bar(g)
Pilot Pressure Range	1.9 to 10 bar(g)
Pilot Air Connection	G 1/4 internal thread
Medium Temperature Range	-10 °C to +185 °C
Ambient Temperature Range	-10 °C to +55 °C
Storage Temperature	-20 °C to +65 °C
Protection Class	IP67 (EN 60529 / IEC 60529)
Seat Leakage Rate	Leakage rate A according to DIN EN 12266-1
Installation Altitude	Max. 2,000 m above sea level

Materials of Construction

Position	Element	Material
1	Transparent cover with position indicator	Polycarbonate (PC)
2	Pilot air port	Stainless steel 1.4305
3	Actuator housing	Polyamide (PA)
4	Piston seal	Nitrile butadiene rubber (NBR)
5	Packing gland	PTFE V-rings (filled) with spring compensation
6	Actuator spring	Stainless steel 1.4310
7	Tube	Stainless steel CF3M
8	Wiper	PTFE (filled)
9	Body seal	Graphite (PTFE optional)
10	Spindle	Stainless steel 1.4401 / 1.4404
11	Pin	Stainless steel 1.4401 / 1.4404
12	Seat seal	PTFE
13	Valve body	Stainless steel CF3M (316L)
14	Swivel plate	Stainless steel CF3M / 1.4401 / 1.4404

Dimensions and Installation Geometry

Welded Body Dimensions (ISO 4200 / DIN EN ISO 1127 / DIN 11866 Series B)

• Nominal Size (DN): 32 mm
• Weld End Insertion Depth (ES): 26 mm
• Centerline-to-Body Port Offset (CS): 45 mm
• Face-to-Face Overall Length (LS): 145 mm
• Pipe Outer Diameter (Ø DS): 42.4 mm
• Pipe Wall Thickness (WS): 2.0 mm

Actuator Dimensions (Size 63 / Code E)

• Actuator Outer Diameter (Ø A): 80 mm
• Overall Valve Height (B / H): 188 mm maximum
• Actuator Centerline Clearance (K / M): 169 mm
• Pilot Air Port (P): G 1/4
• Vertical Disassembly Clearance (BS / HS): 257 mm

Pilot Pressure and Operating Limits

For actuator size 63 (E) with flow above the seat, maximum pilot pressure is 10 bar(g). The minimum pilot pressure required to open the valve depends on operating line pressure, starting from 1.9 bar(g) at zero line pressure and increasing up to 4.5 bar(g) at maximum working pressure.

Pressure-Temperature Derating

Operating pressure must be adjusted according to DIN EN 12516-1 PN25 and ASME B16.34 Class 150 limits at elevated temperatures:

• -10 °C to +50 °C: 25.0 bar (Class 150: 19.0 bar)
• +100 °C: 24.5 bar (Class 150: 16.2 bar)
• +150 °C: 22.4 bar (Class 150: 14.8 bar)
• +185 °C: 21.0 bar (Class 150: 14.0 bar)

Ambient temperature for the PA actuator is derated with increasing medium temperature. At medium temperatures approaching +185 °C, maximum allowable ambient temperature is +55 °C.

Installation, Pipeline Welding, and Maintenance

Type 2000 may be mounted in any orientation, preferably with the actuator upright.

Dismantle Actuator Before Welding

For welded valve bodies, always remove the actuator assembly prior to welding the valve body into the pipework. Welding heat will destroy internal PTFE spindle seals, body gaskets, and plastic actuator components.

Assembly Instructions

1. Actuator Disassembly: Apply 5.0 bar compressed air to the lower pilot air port (port 10) to lift the swivel plate off the seat. While pressurized, use an open-end wrench on the body connection hexagon flats (item 8) to unscrew the actuator from the valve body.
2. Welding Body: Weld the CF3M body into the flushed, debris-free pipeline. Ensure pipe alignment is stress-free.
3. Actuator Reassembly: Inspect the body seal. Apply Klüberpaste UH1 96-402 grease to the interface threads. Pressurize the actuator with 5.0 bar pilot air to retract the swivel plate. Screw the actuator into the body and tighten to 65 Nm (+10/-5 Nm).
4. Actuator Alignment: The actuator can be steplessly rotated 360° to position the G 1/4 pilot air port. While pressurized with 5.0 bar, rotate the actuator hexagon strictly in the designated direction to avoid loosening the body interface.

Visual Leakage Inspection

Inspection Point	Observation	Corrective Action
1: Media connection	External leak at weld seam	Re-weld or reseal pipeline interface
2: Relief bore	Media discharging from actuator weep hole	Replace spindle packing gland set or complete actuator
3: Swivel plate	Internal leakage across closed seat	Replace swivel plate seal set; check for debris
4: Body joint seal	Leakage at body-to-actuator interface	Replace body seal; retorque connection to 65 Nm

Troubleshooting Guide

Malfunction	Root Cause	Remedy
Actuator fails to open	Pilot air connected to wrong port	Connect pilot supply to lower actuator port (CF A)
Actuator fails to open	Pilot pressure below minimum limit	Increase pilot pressure according to pressure chart
Actuator fails to open	Operating pressure exceeds 16 bar(g)	Verify system pressure matches rating plate limits
Seat leakage across valve	Foreign debris trapped on seat	Flush pipeline; clean or replace seat disc
Seat leakage across valve	Worn PTFE seat seal	Install replacement swivel plate set
Leakage at relief weep bore	Spindle packing gland worn	Install replacement packing gland kit

Automation Accessories and Service Kits

• Electrical Position Feedback: Type 8697 pneumatic control unit and position transmitter, mounting directly onto CLASSIC actuators.
• Direct-Mount Pilot Valves: Type 7012 3/2-way direct-acting plunger valve with G 1/4 banjo bolt connection for direct assembly to the pilot port.
• Actuator Service Wrench: Special face spanner for Ø 63 mm (E) actuator cover, order number 639170.
• Packing Gland Tooling: Socket wrench order number 683223 (21 mm wrench opening for DN 32-80) and mounting sleeve order number 639167 (10 mm spindle diameter for size E).
• Spare Parts: Process valve packing gland seal kit and process valve swivel plate replacement kit.