BURKERT 20106029 (Type 2961) control valve consists of a manual actuator and a globe valve body with exchangeable seats made of high-quality 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, even under demanding operating conditions. A soft PTFE or PEEK 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
• Exchangeable valve seats enable perfect coordination under the most demanding operating conditions
• Robust actuator with optional stroke limitation and locking
• Stainless steel valve body with welded connection (DIN EN ISO 1127 / ISO 4200 / DIN 11866 Series B)

Technical Data

Property	Value
Design	Globe control valve
Nominal diameter	DN 15 (NPS 1/2) - 21.3x1.6
Flow direction	Flow to open (below seat)
Operating pressure	0 bar(g)...25 bar(g)
Nominal pressure	PN 25 (DIN EN 1333), Class 150 (DIN EN 1759)
Seat leakage	Leakage class II (metal seals), Leakage class VI for PTFE and PEEK
Kv value (water)	0.1 m³/h
Operating characteristic	Equal percentage 20 : 1
Operating medium	Steam, water, neutral gases, alcohols, oils, fuels, hydraulic fluids, salt solutions, alkalis, organic solvents
Medium temperature	-10 °C...+ 185 °C
Ambient temperature	-10 °C...+ 60 °C
Installation position	As required, preferably with actuator upright

Materials

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	Stainless steel, hardened valve seat
Valve body	Stainless steel 316L/CF3M

Dimensions

Body with Welded Connection

Note: Dimensions in mm, unless otherwise stated.

Nominal diameter (port connection)	ES	LS	DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B
DN 15	20	90	∅ DS: 21.3, WS: 1.6

Installation and Operation

Position Indicator

1. Handwheel with scale
2. Reproducible stroke scale

When turning the handwheel anticlockwise, the reproducible stroke scale becomes visible between the position indicator and the handwheel.

INFO

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.

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

• Cone of equal per cent for valve seat sizes 8 to 100
• Flow characteristic as per DIN EN 60534-2-4

Safety and Explosion Protection

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.

ATEX/IECEx Special Conditions

For devices with Ex approval (e.g., Ex h IIC T4...T2 Gb / Ex h IIIC T135°C...T300°C Db):

DANGER

Risk of explosion due to electrostatic charge! 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 clean the device surface by wiping it gently with a damp or antistatic cloth.
• Ground the actuator and the valve body.

Device Grounding:

1. Ground the valve body. To establish potential equalization, ground the valve body to the pipe system using a conductive connection.
2. Ground the conductive parts of the device. Conductive parts must be grounded separately. To do this, install a grounding strap clip or grounding terminal (if not pre-installed) and ground via the grounding point.