BURKERT 309490 (Type 2060) pneumatically operated 2/2-way angle seat valve with a stainless steel actuator fulfills the demands of tough process environments. Unrivalled life time and sealing integrity is guaranteed by the trusted self-adjusting packing gland. The stainless steel actuator has been designed for tough applications, and laser welding ensures it is both cleanable and robust. With a ducted exhaust air port, the actuator can be operated isolated from the environment to guarantee an optimum life time and hygiene. High flow rates are attained with the optimised stainless steel angle seat body.

This specific 309490 model features Control Function B (normally open), a PTFE seat seal, a nominal seat diameter of 25 mm, and is rated for operating pressures up to 16 bar and medium temperatures from -10 °C to 185 °C. All wetted parts comply with the EC Directive 1935/2004.

• Flow optimised stainless steel body with various line connections
• Trusted components for the longest life time
• Stainless steel actuator suitable for demanding environments
• High seal tightness due to self-adjusting packing gland
• Actuator can be seamlessly rotated by 360°

General Technical Data

Product properties
Design	Angle seat valve
Nominal diameter	DN 10...DN 80, NPS 3/8...NPS 3
Safety setting	Normally closed (control function A), normally open (control function B)
Flow direction	Flow to open (below seat), flow to close (above seat)
Operating pressure	0 bar(g)...25 bar(g) (Model 309490: 0-16 bar)
Pilot pressure	2...10.5 bar(g)
Seat leakage	Leakage rate A (DIN EN 12266-1), seat seal PTFE and PEEK, test medium air
Medium	Steam, water, neutral gases, alcohols, oils, fuels, hydraulic fluids, salt solutions, alkalis, organic solvents
Medium temperature	-40...+230 °C (Model 309490: -10...+185 °C)
Viscosity	Max. 600 mm²/s
Control medium	Air, neutral gases
Ambient temperature	-10...+130 °C
Degree of protection	IP65/67
Installation position	As required, preferably with actuator upright

Control Functions

Depending on the variant, the valve seat is closed with or against the medium flow. Spring action (CF A) or pneumatic pilot pressure (CF B and CF I) generate the closing force on the swivel plate. Force is transmitted through a spindle connected to the piston actuator.

• 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. (Applies to model 309490)

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

Actuator size 50 (D), 70 (M), 90 (N), 130 (P)

No.	Element	Material
1	Transparent cover	Optical position indicator Polysulfone PSU
2	Pilot air ports	Threaded bushing G 1/8" Stainless steel 1.4404 (316L)
3	Spring support	Stainless steel 1.4308
4	Spindle extension	Stainless steel 1.4104
5	Actuator casing	Stainless steel 1.4404 (316L)
6	Piston seal	FKM
7	Actuator base (interface)	Stainless steel 1.4308
8	Spring	Stainless steel 1.4310
9	Pipe	Stainless steel 1.4401 (316)/1.4404 (316L)
10	Packing gland	PTFE V-Rings (filled), with spring compensation
11	Spindle	Stainless steel 1.4401 (316)/1.4404 (316L)
12	Spindle guide	PTFE (filled) for actuator size 50(D) / PEEK for actuator size 70(M), 90(N), 130(P)
13	Swivel plate	Stainless steel 1.4401 (316)/1.4404 (316L)
14	Seat seal	PTFE, PEEK (optional), NBR (optional), FKM (optional)
15	Valve body	Stainless steel CF3M

Dimensions

Actuator

Nominal diameter (port connection)	Actuator size Ø	Ø A	B/H	K	P
DN	NPS
10	3/8	32 (B)	36.4	89.4	8.6
15	1/2	50 (D)	55	154	11
20	3/4	50 (D)	55	157	11
25	1	50 (D)	55	169	11
32	1 1/4	70 (M)	75	193	11
40	1 1/2	90 (N)	96	242	14
50	2	130 (P)	137	301	14

(Note: Dimensions in mm. The dimensions for B, H and K are maximum dimensions and may be up to 6 mm less, depending on the connection orifice size and standard.)

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.

NOTE

Damage to the seat seal or seat contour. When removing or installing the actuator, or when rotating the actuator, the valve must be in the open position.