Burkert Type 2961 (SKU 20082425) manually operated 2-way globe control valve consists of a manual actuator and a globe valve body with exchangeable seats made of 316L/CF3M stainless steel. Each globe valve body can be equipped with up to 8 valve seat sizes and reaches the desired flow characteristic curve in interaction with parabolic cones. The precise spindle guide enables control under demanding operating conditions. A soft PTFE seal guarantees reliable sealing up to 25 bar. The actuator is made of high-quality plastic and possesses a visual position indicator. The packing gland uses tried-and-tested V-seals and possesses spring compensation, eliminating the need for manual adjustment.

Product Features

• Excellent control accuracy with an equal percentage flow characteristic.
• Exchangeable valve seats enable coordination under demanding operating conditions.
• Actuator with optional stroke limitation and locking.
• Stainless steel valve body with a DN 15 welded connection (for SKU 20082425).
• Packing gland uses PTFE V-rings with spring compensation.

Material Specifications

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

Dimensions (Welded Connection)

For the DN 15 welded connection variant (SKU 20082425):

• Nominal diameter (port connection): DN 15
• ES: 20 mm
• LS: 90 mm
• DIN 11850-2 / DIN 11866 series A: Ø DS 19.0 mm, WS 1.5 mm

Performance and Operating Limits

• Operating pressure: 0 to 25 bar(g)
• Nominal pressure: PN 25 (DIN EN 1333)
• Medium temperature: -10 °C to +130 °C (PTFE seal)
• Ambient temperature: -10 °C to +60 °C
• Seat leakage: Leakage class VI for PTFE according to DIN EN 60534-4:2006
• Flow characteristic: Equal percentage
• Kv value (water): 4.3 m³/h

Installation and Operation

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

High Pressure Hazard

Switch off the pressure before working on the device or system. Vent or drain the lines. Do not reach into the openings of the valve body due to the risk of crushing by mechanically powered parts.

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 (50 positions). The reproducible stroke scale shows the relative position of the valve (valve opening) depending on the bottom edge of the handwheel.

Stroke Limitation and Locking

Setting the minimum and maximum stroke limit is possible as an option using an adjusting sleeve. The handwheel can be locked to prevent unintentional or unauthorised operation of the valve. The locking pin has a Ø 3.8 mm bore and can be secured with a padlock.

ATEX / Explosion Protection

As a category 2 device, specific variants are suitable for zone 1/21 and zone 2/22. Conductive parts must be grounded individually to prevent electrostatic charging hazards. Only use cleaning agents approved for explosive environments.