BURKERT Type 2101 pneumatically operated 2/2-way globe valve is specially optimised for decentralised process automation and meets all practical requirements even under difficult operating conditions. Its unique design allows easy integration of automation units in all expansion stages, from electrical/optical position feedback to pneumatic control and integrated fieldbus interface. Maximum service life and tightness are achieved by the proven self-adjusting v-seal packing gland. The highly integrated system of valve and automation unit is characterised by its compact and smooth design, integrated pilot air ducts, protection classes IP65/67, NEMA Type 4X, and high resistance to chemicals.

General Technical Data

Product Properties	Description
Design	Globe valve
Nominal diameter	DN 10...DN 100, NPS 3/8...NPS 4
Safety setting	Normally closed (control function A), normally open (control function B)
Flow direction	Against closing direction (below seat), with closing direction (above seat)
Operating pressure	0 bar(g)...25 bar(g), 40 bar(g) on request. Vacuum variants down to -0.9 bar(g)
Medium temperature	-40 °C...+230 °C
Ambient temperature	-10 °C...+100 °C
Operating medium	Steam, water, neutral gases, alcohols, oils, fuels, hydraulic fluids, salt solutions, organic solvents, oxygen, fuel gases, hydrogen (optional)
Degree of protection	IP65/67

Structure and Function

The globe valve consists of a pneumatically actuated piston actuator and a 2-way body. The actuator is made from polyphenylene sulphide (PPS) or stainless steel (for actuator size 225). Depending on the variant, the valve seat is closed in the direction of or against the medium flow.

Control Functions

• Control function A (CFA): Pneumatically operated 2/2-way on/off valve. Normally closed by spring force.
• Control function B (CFB): Pneumatically operated 2/2-way on/off valve. Normally opened by spring force.
• Control function I (CFI): Actuating function via reciprocal pressurisation.

Flow Direction Below Seat

Depending on the variant, the valve is closed against the medium flow either with spring force (CFA) or pilot pressure (CFB or CFI). As the medium is present under the swivel plate, the operating pressure contributes to the opening of the valve.

WARNING

Valve leak if there is too little minimum pilot pressure or high operating pressure! Minimum pilot pressure for CFB and CFI that is too low, or failing to meet the permitted operating pressure, can cause a leak in the valve seat. Adhere to minimum pilot pressure and do not exceed the operating pressure.

Flow Direction Above Seat

The valve is closed with the medium flow via spring force (CFA). Because the operating pressure is above the swivel plate, it helps the valve close and also contributes to sealing the valve seat. The valve opens via pilot pressure.

DANGER

Risk of damage due to bursting pipes and bursting equipment when the flow is above the seat. In the case of liquid mediums, water hammer can occur causing pipes and the device to burst. Do not use valves with flow above the seat for liquid mediums.

Materials

Element	Material
Actuator cover	PPS
Actuator casing	Stainless steel 1.4561 (316Ti)
Spindle packing	PTFE V-Rings (filled), with spring compensation
Spindle	Stainless steel 1.4401 (316)/1.4404 (316L)
Swivel plate	Stainless steel 1.4401 (316)/1.4404 (316L)
Seat seal	PTFE, PEEK (option)
Valve body	Stainless steel 316L / CF3M

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.

Optional Variants

• High-temperature variant: Suitable for applications with steam, neutral gases, and other heat transfer mediums up to +230 °C.
• Water variant: Recommended for water temperatures starting at +85 °C, increasing service life significantly.
• Drinking water variant: Wetted materials are tested for suitability with drinking water up to +85 °C.
• Vacuum variant: Without leakage bore, suitable for pressures down to -0.9 bar(g).
• Low-temperature variant: Suitable for minimum medium temperatures down to -40 °C.
• Oxygen & Hydrogen variants: Tested for suitability with specific gases under defined pressure and temperature limits.

Approvals and Conformities

• Explosion Protection: 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.
• Foods and Beverages/Hygiene: FDA, USP, EC Regulation 1935/2004, China food GB Standards.
• Others: DNV GL classification, TA Luft.