Burkert 377777 Type 2101 is a pneumatically operated 2/2-way globe valve ELEMENT optimized for decentralized process automation. It meets 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 characterized 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

Feature	Specification
Design	Globe valve
Safety setting in case of power failure	Normally closed (control function A)
Flow direction	Against closing direction (below seat), with closing direction (above seat)
Operating pressure	0 bar(g)...12 bar(g) (for SKU 377777)
Nominal pressure	PN 25 (DIN EN 1333)
Pilot pressure	2.7 bar(g)...7.0 bar(g)
Seat leakage	Leakage rate A (DIN EN 12266-1), seat seal PTFE, test medium air
Medium temperature	-10 °C...+185 °C
Ambient temperature	-10 °C...+100 °C
Degree of protection	IP65/67
Installation position	As required, preferably with actuator in upright position

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.

Flow Direction Below Seat

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

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 (control function A, 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.

Risk of injury from pressure surge.

A pressure surge could cause lines and the device to burst. Because of the risk of pressure surge, valves with the flow direction above the seat must not be used for fluid media.

Control Functions

Symbol	Description
	Control function A (CF A) Pneumatically operated 2/2-way on/off valve Flow direction below seat Normally closed by spring force
	Control function B (CF B) Pneumatically operated 2/2-way on/off valve Flow direction below seat Normally opened by spring force

Materials

No.	Element	Material
4	Actuator cover	PPS
5	Actuator casing	Stainless steel 1.4561 (316Ti)
6	Piston seal	FKM
9	Spindle packing	PTFE V-Rings (filled), with spring compensation
10	Spindle	Stainless steel 1.4401 (316)/1.4404 (316L)
12	Body seal	Graphite, PTFE (option)
13	Swivel plate	Stainless steel 1.4401 (316)/1.4404 (316L)
14	Seat seal	PTFE, PEEK (option)
16	Valve body	Stainless steel 316L / CF3M

Operating Conditions

Temperature Ranges

Actuator size [mm]	Actuator material	Medium temperature [°C] (PTFE seat seal)	Environment [°C]
ø 50, ø 70, ø 90, ø 130	PPS	-10...+185	-10...+100
ø 225	Stainless steel	-10...+185	-10...+100

Pressure Ranges

Actuator size [mm]	Maximum pilot pressure
ø 50, ø 70, ø 90	10 bar
ø 130	7 bar
ø 225, CFA	7 bar
ø 225, CFB	5 bar

Installation Notes

• The installation location must be easily accessible and provide sufficient clearance for installation, removal and maintenance of the device.
• Use suitable lifting gear to lift a heavy device.
• Only lift heavy valves by the valve body and pneumatic actuator, not by the control unit.
• Ensure that the pipes are aligned before connecting the valve.
• Observe the direction of flow. Observe the information on the type label.
• The globe valve can be installed in any position, preferably with the actuator facing upwards.

Dirt trap for devices with approval according to DIN EN 161

According to DIN EN 161 "Automatic shut-off valves for gas burners and gas appliances", a dirt trap must be installed upstream of the valve. The dirt trap must prevent the penetration of a 1 mm test pin.