BURKERT 20137289 is a complete pneumatically operated 2/2-way globe valve from the ELEMENT Type 2101 series, engineered for demanding industrial on/off switching duties and decentralised process automation. Configured with control function A (normally closed by spring force), this valve delivers bubble-tight shut-off against media flowing below the seat up to 40 bar operating pressure. It features an investment cast 316L stainless steel body with G 3/4 internal thread ports, a DN 20 nominal seat orifice, a wear-resistant PTFE seat seal, and an integrated polyphenylene sulphide (PPS) piston actuator.

Equipped with a self-adjusting PTFE V-ring packing gland with spring compensation, BURKERT 20137289 maintains stem tightness across thermal cycles from -10 °C to +185 °C. The valve provides a nominal water flow coefficient Kv of 8.1 m³/h and is fully CIP and SIP cleanable. The actuator casing incorporates integrated internal pilot channels, G 1/8 internal threaded pilot ports, and an IP65/IP67 enclosure rating according to IEC 529 and EN 60529, providing resistance against harsh washdown procedures and corrosive industrial atmospheres.

Technical Specifications

Specification Parameter	Value
Product Type	2/2-Way Globe Valve (ELEMENT Type 2101)
Article Number	20137289
Operating Mode (Control Function)	CF A: Normally closed (NC) by internal spring force
Flow Direction	Below seat (closes against flow direction)
Port Connection	Internal thread G 3/4 (DIN ISO 228-1)
Orifice Size (Nominal Seat Diameter)	DN 20 (20 mm)
Flow Factor Kv (Water at +20 °C)	8.1 m³/h
Nominal Pressure Class	PN 40 (DIN EN 1333) / Class 150 (DIN EN 1759)
Operating Medium Pressure Range	0.00 bar(g) to 40.00 bar(g)
Control (Pilot) Pressure Range	5.0 bar(g) to 10.0 bar(g)
Pilot Air Connection	G 1/8 internal thread
Medium Temperature Range	-10 °C to +185 °C
Ambient Temperature Range	-10 °C to +100 °C
Valve Body Material	Stainless steel 316L / CF3M
Actuator Housing Material	Polyphenylene sulphide (PPS)
Seat Seal Material	PTFE (Polytetrafluoroethylene)
Spindle Packing Seal	PTFE V-rings (filled), spring-compensated
Seat Leakage Rate	Leakage rate A according to DIN EN 12266-1 (Air test medium)
Ingress Protection Class	IP65 / IP67 according to IEC 529 / EN 60529
Cleaning Capability	CIP (Clean-in-Place) and SIP (Sterilisation-in-Place)

Construction and Materials

BURKERT 20137289 utilizes an ELEMENT series design where the pneumatic piston actuator directly mounts to the 316L stainless steel globe body. The internal sealing arrangement relies on a self-aligning swivel plate that presses the PTFE seal flatly against the screwed-in stainless steel seat.

Item No.	Component Part	Material Specification
1	Ground terminal	Stainless steel 1.4301 / 1.4305 (standard on ATEX variants)
2	Optical position indicator	Polysulfone (PSU)
3	Pilot air port	G 1/8 thread (stainless steel 1.4305) or push-in connector
4	Actuator cover	Polyphenylene sulphide (PPS)
5	Actuator casing	Stainless steel 1.4561 (316Ti)
6	Piston seal	Fluoroelastomer (FKM)
7	Spring assembly	Stainless steel 1.4310
8	Spindle tube / pipe	Stainless steel 1.4401 (316) / 1.4404 (316L)
9	Spindle packing gland	Filled PTFE V-rings with Belleville spring washer compensation
10	Valve spindle	Stainless steel 1.4401 (316) / 1.4404 (316L)
11	Spindle guide	Polyether ether ketone (PEEK) for DN 15 to DN 65
12	Body seal	Graphite (PTFE optional)
13	Swivel plate	Stainless steel 1.4401 (316) / 1.4404 (316L)
14	Seat seal	Polytetrafluoroethylene (PTFE)
15	Valve seat with O-ring	Stainless steel 1.4571 with EPDM O-ring
16	Valve body	Stainless steel 316L / CF3M

Lubrication and Hygiene Standards

All lubricants used in the spindle packing gland and actuator mechanism are rated and registered according to NSF H1, preventing process contamination in sanitary, food, and pharmaceutical applications.

Operating Principle and Flow Direction

BURKERT 20137289 operates under Control Function A (CFA) with media entering below the valve seat. In its unpressurised rest state, heavy-duty return springs push the valve spindle and swivel plate downward against the valve seat, keeping the orifice closed.

Applying pilot air pressure between 5.0 bar and 10.0 bar to pilot air port 1 overcomes spring compression, lifting the spindle and opening the path. Because process fluid pressure acts upward beneath the swivel plate, it supports opening and prevents hydraulic water hammer upon closure.

Water Hammer Prevention

Do not use valves configured for flow above the seat with incompressible liquid media. For liquid handling, always select flow below the seat as configured in article 20137289 to avoid damaging pressure surges and pipe ruptures.

Compatible media include steam, demineralized water, alcohols, fuel oils, hydraulic fluids, neutral gases, salt solutions, and organic solvents with a maximum kinematic viscosity of 600 mm²/s.

Dimensions and Mechanical Interface

The valve body features standard female pipe threads G 3/4 conforming to DIN ISO 228-1. The entire actuator housing can be rotated continuously through 360° to orient pilot ports and accessories without breaking the body seal.

Threaded Body Dimensions (DIN ISO 228-1)

Nominal Diameter (DN)	Thread Size (NPS)	Thread Depth E [mm]	Body Face-to-Face LM [mm]	Wrench Flat AF [mm]
DN 10	G 3/8	12.0	65	27
DN 15	G 1/2	14.0	65	27
DN 20 (20137289)	G 3/4	16.0	75	34
DN 25	G 1	18.0	90	41
DN 32	G 1 1/4	20.0	110	50
DN 40	G 1 1/2	22.0	120	55
DN 50	G 2	24.0	150	70
DN 65	G 2 1/2	26.0	185	85
DN 80	G 3	28.0	205	100
DN 100	G 4	32.0	240	125

For article 20137289 (DN 20, G 3/4), the body installation length LM is 75 mm, thread engagement depth E is 16 mm, and the external hexagon spanner width AF is 34 mm.

Pressure and Temperature Operating Limits

Operating pressure ratings are bounded both by the valve actuator force and the thermal derating curves defined in DIN EN 12516-1 (PN 40) and ASME B16.5 / B16.34 Class 150.

Pressure Derating for PN 40 Bodies (DIN EN 12516-1)

Temperature Range [°C]	Maximum Permissible Operating Pressure [bar]
-10 °C to +50 °C	40.0 bar
+100 °C	39.2 bar
+150 °C	36.0 bar
+185 °C (PTFE seat limit)	33.0 bar
Saturated steam at 185 °C	10.0 bar (approximate saturated steam limit)

Ambient thermal constraints depend on the pilot air connection method. With threaded G 1/8 pilot ports, ambient operating temperatures range from -10 °C to +100 °C. If top-mounted pilot solenoid valves or control units are fitted, the maximum ambient temperature is limited to +55 °C.

Installation and Commissioning

BURKERT 20137289 can be installed in any orientation, though vertical upright orientation with the actuator uppermost is recommended to minimize particulate settling.

Tightening Torques and Pipeline Alignment

Clean and flush pipelines thoroughly to remove weld slag, metal swarf, and sealing tape prior to connecting the valve body. Use an open-end spanner on the provided body flats (AF 34 mm for DN 20). Never use a pipe wrench on the actuator housing or valve neck.

Body Connection Tightening Torques

Valve Body Orifice (DN)	Tightening Torque for Body-Actuator Connection [Nm]
DN 15	45 ± 3 Nm
DN 20 (20137289)	50 ± 3 Nm
DN 25	60 ± 3 Nm
DN 32 / DN 40	65 ± 3 Nm
DN 50	70 ± 3 Nm
DN 65	100 ± 3 Nm
DN 80	120 ± 5 Nm
DN 100	150 ± 5 Nm

Pneumatic Connection Procedure

1. Connect compressed air supply lines (5.0 to 10.0 bar) to pilot air port 1 of the actuator.
2. When operating without an integrated control top, install the supplied porous breather/silencer into exhaust port 2 to prevent dirt ingress.
3. To reposition air connections, pressurize port 1 with 5 bar air to lift the seat, apply an open-end spanner to the body hexagon, and rotate the actuator housing counter-clockwise to the desired angle.

Maintenance and Spare Parts

When operated within specified media and pressure boundaries, the pneumatic actuator is maintenance-free. Wear is concentrated on the PTFE seat seal, swivel plate, and spindle V-ring packing.

Regularly inspect the relief inspection bore on the lower valve neck. Fluid escaping from the relief bore indicates packing wear, requiring immediate replacement of the packing seal set.

Spare Part Sets for DN 20 / Type 2101

Spare Part Assembly	Contents	Order Number
Valve Set DN 20 (PTFE Seal)	Swivel plate with PTFE seal, connecting pin, body seal ring	011 171
Valve Seat Set DN 20	Screwed-in valve seat (DN 20), O-ring, body seal ring	262 157
Packing Gland Seal Set DN 15–50	Chevron V-rings, thrust collars, spring, guide, lubricant	216 433
Valve Seat Assembly Tool DN 20	Dedicated insertion and torque driver tool	652 605
Packing Gland Socket Tool	Modified socket wrench for 10 mm spindle (AF 19)	683 221

When replacing the screwed-in valve seat, clean the body threads thoroughly, apply Klüberpaste UH1 96-402, and tighten to 28 ± 3 Nm using assembly tool 652 605. Tighten the packing gland spindle guide to 6 Nm for 10 mm spindles.

Decentralised Automation Integration

BURKERT 20137289 seamlessly integrates with the BURKERT ELEMENT automation series to build decentralized automated process systems (Type 8801-GC):

• Type 8691 Control Head: High-visibility multicolour LED status displays, non-contact contactless inductive position sensors, integrated pilot solenoid valves, AS-Interface or IO-Link communications.
• Type 8695 Control Head: Ultra-compact variant for Ø 50 mm actuators, with integrated pilot valve, manual override, and teach-in automatic travel detection.
• Type 8690 / Type 8697 Pneumatic Control Units: Mechanical or inductive limit switches for end-position electrical feedback, mechanical position indicator, optional ATEX/IECEx intrinsically safe approvals.