Burkert 20059774 Type 2300 is a pneumatically operated 2-way angle seat control valve designed to fulfill tough criteria for process environments. In line with Bürkert’s philosophy for modular valves and sensors, it features a highly durable self-adjusting packing gland that guarantees unrivalled cycle life and sealing integrity. The parabolic trim results in a flow characteristic approximately 35% larger than conventional control valves. It is available with either a stainless steel on stainless steel seal or a durable PTFE seal for tight shut-off.

The design enables the easy integration of automation modules, whether they are digital electropneumatic positioners or process controllers. The fully integrated system has a compact and smooth design, integrated pneumatic lines, IP65/67 protection class, and superior chemical resistance. This system has been engineered for reliable, accurate control in applications where a high flow rate is an advantage.

Key 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 thread, clamp, and weld end connections

General Technical Data

Product Properties	Specification
Design	Angle seat control valve
Nominal diameter	DN 10...DN 65, NPS 3/8...NPS 2 1/2
Safety setting	Normally closed (control function A), normally open (control function B)
Flow direction	Flow to open (below seat)
Operating pressure	0 bar(g)...25 bar(g), vacuum variants...- 0.9 bar(g) (option)
Nominal pressure	PN 25 (DIN EN 1333), Class 150 (DIN EN 1759)
Pilot pressure	5.6 bar(g)...7 bar(g)
Seat leakage	DIN EN 60534 - 4:2006 (Leakage class III/IV for Stainless steel, VI for PTFE/PEEK)
Operating characteristic	Modified equal percentage
Process medium	Steam, water, neutral gases, alcohols, oils, fuels, hydraulic fluids, salt solutions, alkalis, organic solvents and oxygen
Medium temperature	- 40 °C...+ 230 °C
Viscosity	Max. 600 mm²/s
Control medium	Air, neutral gases
Ambient temperature	- 10 °C...+ 80 °C (depends on control unit)
Degree of protection	IP65/67

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.

Control Functions (CF)

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

WARNING

For control function I – risk of pilot pressure failure! With control function I, the control unit and reset are pneumatic. No defined position is reached during a pressure failure. To ensure a controlled restart of the device, first apply pilot pressure and then activate the medium.

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). Because the medium pressure is below the control cone, it helps open the valve.

Material Specifications

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

Approvals and Conformities

• Explosion Protection (ATEX/IECEx): Optional (variable code PX51). Suitable for zone 1/21 and zone 2/22. Ex h IIC T4...T2 Gb / Ex h IIIC T135 °C...T300 °C Db.
• Drinking Water: Suitable for use in drinking water applications (UBA).
• Foods and Beverages/Hygiene: FDA compliant, USP biocompatible, EC Regulation 1935/2004 compliant, China food GB Standards compliant.
• DNV GL Classification: Accepted for installation on all vessels classed by DNV GL.
• Oxygen: Optional suitability for use with gaseous oxygen.
• TA Luft: Compliant with technical instruction on air quality control.

Operating Limits for Seat Seal

Tight sealing required	Leakage class (DIN EN 60534 - 4)	Medium temperature	Seat seal
No	III/IV (metal seals)	-40...+230 °C	Stainless steel
Yes	VI (soft seals)	-40...+130 °C (recommended for ≤ +130 °C)	PTFE
Yes	VI (soft seals)	-10...+230 °C (recommended for > +130 °C)	PEEK

Safety Instructions

DANGER

Risk of injury from high pressure in the system! Before working on the system or device, switch off the pressure and vent or empty the lines.

WARNING

Risk of injury when opening the actuator! The actuator contains a spring under tension. When the actuator is opened, the spring will jump out and may cause injuries. Do not open the actuator.

DANGER

Danger of explosion due to electrostatic discharge (ATEX variants)! If statically charged devices or persons discharge suddenly, there is an explosion hazard in the potentially explosive area. Take suitable measures to ensure that no electrostatic charge can build up. Only wipe the device surfaces gently with a damp or anti-static cloth. Ground the actuator and valve body.

TIP

Turning the actuator The position of the ports can be seamlessly aligned by turning the actuator 360°. Only the actuator can be rotated. It is not possible to rotate the control unit against the actuator. When turning the actuator, the valve must be in the open position to avoid damage to the seat seal or seat contour.

Networking and Combination

The angle seat valve Type 2300 can be combined with the process controller Type 8693 or the positioner controller Type 8692/8694/8696 to form the Continuous ELEMENT valve system Type 8802-YG. It can also be combined with remote positioners like Type 8792 or 8793.