The Burkert 20089003 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 (PPS) 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
• Also suitable for demanding operating conditions
• Robust actuator with optional stroke limitation and locking
• Stainless steel valve body with welded connection
• Flow to open (below seat) direction

Technical Data

Property	Value
Design	Angle seat control valve
Nominal diameter	DN 32 (NPS 1 1/4)
Port connection	Welded (DIN EN ISO 1127 / ISO 4200 / DIN 11866 Series B), 42.4x2.0
Operating pressure	0 bar(g) to 25 bar(g)
Nominal pressure	PN 25 (DIN EN 1333), Class 150 (DIN EN 1759)
Seat leakage	Leakage class VI (PTFE) according to DIN EN 60534-4:2006
Kv value (water)	23 m³/h
Operating characteristic	Modified equal percentage (50:1)
Medium temperature	-10 °C to +130 °C
Ambient temperature	-10 °C to +60 °C
Installation position	As required, preferably with actuator upright

Approvals and Conformities

• Explosion Protection (ATEX / IECEx): II 2 D Ex h IIIC T135°C...T300°C Db, II 2 G Ex h IIC T4...T2 Gb. Suitable for zone 1/21 and zone 2/22.
• Pressure Equipment Directive: 2014/68/EU
• Drinking Water: Suitable for use in drinking water applications. Materials comply with UBA assessment principles.
• Foods and Beverages / Hygiene: FDA (Code of Federal Regulations), USP (United States Pharmacopeial Convention), EC Regulation 1935/2004, China food GB Standards.

ATEX Safety Note

When used in potentially explosive atmospheres, ensure the device is properly grounded to prevent electrostatic charging hazards. The ambient and medium temperature range may be limited by non-ex-relevant specifications.

Material Specifications

Element	Material
Cover	Polyamide (PA)
Handwheel	Polyphenylene sulfide (PPS)
Optical position indicator	Polyamide (PA)
Packing gland	PTFE V-rings (filled), with spring compensation
Spindle	Stainless steel 1.4401 or 1.4404
Spindle guide	Stainless steel 1.4404 (316L), PTFE filled
Body seal	Graphite
Control cone	1.4571 (optionally hardened)
Seat seal	PTFE
Valve body	Stainless steel 316L/CF3M

Design and Function

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 the relative position of the valve (valve opening) and acts as a fixation point for determining the rotation position.

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

The valve features a modified equal percentage flow characteristic with a theoretical rangeability of 50:1.

Installation and Adjustment

Risk of injury due to high pressure

Switch off the pressure before working on the device or system. Vent or drain the lines.

Tightening Torques for Actuator Installation

When screwing the actuator into the valve body, note the tightening torque. For DN 32, the tightening torque is 65 Nm (±3 Nm).

Set Stroke Limit (Optional)

Setting the minimum and maximum stroke limit is possible as an option using an adjusting sleeve.

Lock Handwheel (Optional)

It is also an option to lock the handwheel to prevent unintentional or unauthorised operation of the valve. The locking pin has a bore (Ø 3.8) and can be secured against unauthorised use with a padlock.