The Burkert 20062888 Type 2960 control valve consists of a manual actuator and an angle seat valve body made of high-quality stainless steel. A parabolic cone enables a flow capacity that is up to 35% higher compared to conventional control valves. The precise spindle guide enables control, even under demanding operating conditions. A soft PTFE seal guarantees reliable sealing. The actuator is made of high-quality plastic and is suitable for use in demanding environments. It possesses a visual position indicator and can be optionally equipped with stroke limitation and locking. The packing gland uses tried-and-tested V-seals and possesses spring compensation, which means that it does not need to be pulled back manually.

Product Features

• Excellent control accuracy combined with high flow capacity
• Suitable for demanding operating conditions
• Robust actuator with optional stroke limitation and locking
• Stainless steel valve body with welded connection (DN 15)
• Flow to open (below seat) direction

Materials

No.	Element	Material
1	Cover	Polyamide (PA)
2	Screw	Stainless steel 1.4301
3	Lock pin	Stainless steel 1.4305
4	Handwheel	Polyphenylene sulfide (PPS)
5	Optical position indicator with scale	Polyamide (PA)
6	Packing gland	PTFE V-rings (filled), with spring compensation
7	Spindle	Stainless steel 1.4401 or 1.4404
8	Spindle guide	Stainless steel 1.4404 (316L), PTFE filled
9	Body seal	Graphite
10	Control cone	1.4571 (optionally hardened)
11	Seat seal	PTFE
12	Valve body	Stainless steel 316L/CF3M

Dimensions

Actuator

Nominal connection size (pipe)	Handwheel diameter ∅ [mm]	B1 [mm]	H1 [mm]
DN 15 (NPS 1/2)	45 (S)	148	148

Body with Welded Connection

Nominal diameter (pipe)	ES [mm]	CS [mm]	LS [mm]	∅ DS [mm]	WS [mm]
DN 15 (DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B)	19	34	100	21.3	1.6

Performance Specifications

Fluidic Data

• Modified equal percentage flow characteristic: Higher flow values compared to globe control valves.
• Kv value (water): 5.0 m³/h (measurement with water according to DIN EN 60534-2-4).
• Seat leakage: According to DIN EN 60534-4 (Leakage class VI for PTFE).

Operating Limits

• Operating pressure: 0 to 25 bar(g)
• Medium temperature: -10 °C to +130 °C (PTFE seal)
• Ambient temperature: -10 °C to +60 °C

Installation and Operation

Position Indicator

When turning the handwheel anticlockwise, the reproducible stroke scale becomes visible between the position indicator and the handwheel. The scale on the handwheel determines the rotation position of the handwheel (50 positions). The reproducible stroke scale shows, depending on the bottom edge of the handwheel, the relative position of the valve (valve opening) and acts as a fixation point for determining the rotation position.

INFO

The visibility of the stroke scale is not directly correlated with the closed position of the valve. Depending on the valve design, the repeatable stroke scale may not be visible when the valve is open, or be visible when the valve is closed.

Flow Direction

The valve seat is always closed against the medium flow. The flow direction should therefore be set such that the valve reaches the flow beneath the valve seat.

Flow Characteristic

Setting Stroke Limit

Setting the minimum and maximum stroke limit is possible as an option. An adjusting sleeve is used for this purpose.

1. By turning the handwheel clockwise, the valve is moved to the closed position.
2. Loosen the screw on the handwheel (hexagon socket, width across flats 2) and remove handwheel.
3. Screw adjusting sleeve clockwise until it comes to a stop. Minimum stroke is set.
4. Mount handwheel on actuator. The square on the spindle and the hexagon head of the adjusting sleeve must be correctly aligned.
5. Move the valve to the desired maximally open position.
6. Loosen the screw on the handwheel and remove the handwheel.
7. Pull adjusting sleeve upwards and at the same time, screw anticlockwise until it comes to a stop. Maximum stroke is set.
8. Mount handwheel and tighten the screw with a tightening torque of 0.9 Nm.

DANGER

Risk of injury due to high pressure and escaping medium Switch off the pressure before working on the device or system. Vent or drain the lines.

WARNING

Risk of crushing by mechanically powered parts Do not reach into the openings of the valve body.

Explosion Protection (ATEX)

If the device is used in a potentially explosive area (Category 2, Zones 1/21 and 2/22), specific safety measures must be observed to prevent electrostatic charging hazards.

• Take appropriate measures to ensure that static electricity cannot 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 the valve body.
• Conductive parts must be grounded individually using grounding straps or terminals.

DANGER

Explosion risk due to cleaning agents Only use cleaning agents certified for use in explosive environments.