The BURKERT Type 2100 (Model 351520) angle seat valve is specially optimised for decentralized process automation and fulfils the tough criteria in process environments. 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.

Features

• High flow rates
• Long service life
• Easy integration of automation units with ELEMENT
• Flow-optimised stainless steel valve body with threaded connection
• Suitable for steam, water, neutral gases, alcohols, oils, fuels, and hydraulic fluids

Product Overview

Component	Description	Component	Description
1	Transparent cap with position	2	Actuator cover
3	Actuator housing	4	Relief bore
5	Valve body	6	Flow direction marking
7	Port connection	8	Body connection
9	Actuator connection	10	Pilot air port 1
11	Pilot air port 2

Control Functions

Control function A (CFA) The spring force generates the closing force on the swivel plate. Normally closed by spring force.

Flow Direction Below the Seat

Only use flow direction below the seat for liquid media, gases, and vapours. As the medium is present under the swivel plate, the operating pressure contributes to the opening of the valve.

Flow Direction Above the Seat

Only use flow direction above the seat for gases and vapours. As the medium is present above the swivel plate, the operating pressure contributes to the closing of the valve. The operating pressure also supports the sealing of the valve seat.

WARNING

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

No.	Element	Material
1	Ground terminal	Stainless steel 1.4301/1.4305 only for ATEX variant
2	Optical position indicator	Polysulfone PSU
3	Pilot air ports	Push-in connector PP (Standard)
4	Actuator cover	PPS
5	Actuator casing	Stainless steel 1.4561 (316Ti)
6	Piston seal	FKM
7	Spring	Stainless steel 1.4310
8	Pipe	Stainless steel 1.4401 (316)/1.4404 (316L)
9	Packing gland	PTFE V-Rings (filled), with spring compensation
10	Spindle	Stainless steel 1.4401 (316)/1.4404 (316L)
11	Spindle guide	PEEK
12	Body seal	Graphite, PTFE (Option)
13	Swivel plate	Stainless steel 1.4401 (316)/1.4404 (316L)
14	Seat seal	PTFE, PEEK (Option)
15	Valve body	Stainless steel CF3M

Note

The lubricants for packing gland and actuator are classified according to NSF H1.

Dimensions

Actuator

Nominal diameter (port connection)	Actuator size ∅	∅ A	B	H	K/M
DN 25 (NPS 1)	50 (D)	64.5 mm	175 mm	173 mm	156 mm
DN 25 (NPS 1)	70 (M)	91 mm	191 mm	188 mm	165 mm
DN 25 (NPS 1)	90 (N)	120 mm	229 mm	228 mm	203 mm

Body with Threaded Connection

Nominal diameter	G (DIN ISO 228-1)	NPT (ASME B1.20.1)	RC (ISO 7-1)	CM	LM	AF
DN 25 (NPS 1)	18 mm	16.8 mm	16.8 mm	29.5 mm	90 mm	41 mm

Safety Instructions for Potentially Explosive Atmospheres (ATEX)

If the device is used in a potentially explosive area (Zones 1/21 and 2/22), the following must be observed:

Explosion Hazard due to Electrostatic Discharge

If statically charged devices or persons discharge suddenly, there is a risk of explosion in the potentially explosive area.

• Take appropriate measures to ensure that no electrostatic charge can build up in the potentially explosive area.
• Only wipe the surface of the device gently with a damp or anti-static cloth.
• Ground the actuator and valve body.
• If a plastic valve body is used, ground the actuator separately.

Device Grounding:

1. Ground the valve body. To establish equipotential bonding, ground the valve body to the piping system using a conductive connection.
2. Exposed metal parts that are not integrated into the valve's equipotential bonding (PA) must be incorporated into the PA by the customer via an additional PA connection.
3. Ground the conductive parts of the device individually.