BURKERT 359711 (Type 2300) is a pneumatically operated 2-way angle seat control valve designed to fulfill tough criteria for process environments. Unrivalled cycle life and sealing integrity are guaranteed by the proven self-adjusting packing gland. The parabolic trim results in a flow characteristic approximately 35% larger than conventional control valves. The design enables the easy integration of automation modules whether they are digital electropneumatic positioners or process controllers.

Features

• Excellent combination of good control characteristic and high flow rate
• Long service life
• Control units can be mounted directly without external tubing
• Stainless steel housing with weld end connection
• Food (EC) 1935/2004 compliant according to Manufacturer Declaration

Technical Data

Property	Value
Nominal diameter	DN 25 (1 inch)
Port connection	Weld end (ASME BPE / DIN 11866 Series C)
Control function	B - normally open (NO)
Kv value (water)	16 m³/h
Nominal pressure	PN 25 / Class 150
Operating pressure	-0.9 to 25 bar
Control pressure	5.5 to 7 bar
Medium temperature	-10 °C to +185 °C
Ambient temperature	-10 °C to +100 °C
Valve body material	Stainless steel
Actuator material	PPS (Polyphenylene sulphide)
Seat seal material	Stainless steel

Materials

No.	Element	Material
1	Pilot air ports	Push-in connector PP (standard)
2	Actuator cover	PPS
3	Actuator casing	Stainless steel 1.4561 (316Ti)
4	Piston seal	FKM
5	Spring	Stainless steel 1.4310
6	Pipe	Stainless steel CF3M
7	Packing gland	PTFE V-rings (filled), with spring compensation
8	Spindle	Stainless steel 1.4401 (316)/1.4404 (316L)
9	Spindle guide	Stainless steel 1.4404 (316L)
10	Body seal	Graphite or PTFE
11	Control cone	Stainless steel 1.4571
12	Spring pin	Stainless steel 1.4310
13	Seat seal	Stainless steel 1.4571, PTFE or PEEK
14	Valve body	Stainless steel CF3M

Structure and Function

The angle-seat control valve consists of a pneumatically operated piston actuator, a control cone, and a 2/2-way angle-seat valve body. The control cone is modularly connected to the actuator spindle via a spring-type straight pin, allowing for quick replacement. The valve seats are directly integrated. The flow direction is always below the valve seat.

Flow Direction Below Seat

Depending on the variant, the valve is closed against the medium flow either with spring force or pilot pressure. For Control Function B (CFB), the valve is opened by spring force in the rest position. Because the medium pressure is below the control cone, it helps open the valve.

WARNING

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

Installation Notes

TIP

Any installation position of the angle-seat control valve is possible, preferably with the actuator facing upward. Ensure that pipelines are aligned before connecting the valve.

DANGER

Risk of injury from high pressure in the system! Before loosening lines and valves, turn off the pressure and vent the lines.

When welding the valve body into the pipeline, the control unit must not be installed. The actuator must be removed from the valve body before welding. When removing or installing the actuator, the valve must be in the open position to prevent damage to the seat seal or seat contour.