BURKERT Type 2960 (Article 20099264) is a manually operated 2-way angle seat control valve designed for excellent control accuracy combined with high flow capacity. The 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 possesses a visual position indicator with a scale to set a defined flow rate.

General Technical Data

Product properties
Design	Angle seat control valve
Nominal diameter	DN 10...DN 65, NPS 3/8 ...NPS 2 1/2 (Article 20099264 is DN 65)
Flow direction	Flow to open (below seat)
Operating pressure	0 bar(g)...25 bar(g) (Article 20099264 is 0-24 bar)
Nominal pressure	PN 25 (DIN EN 1333), Class 150 (DIN EN 1759)
Seat leakage	DIN EN 60534-4:2006 (Leakage class VI for PTFE)
Operating characteristic	Modified equal percentage (Equal percentage 50 : 1)
Operating medium	Steam, water, neutral gases, alcohols, oils, fuels, hydraulic fluids, salt solutions, alkalis, organic solvents
Medium temperature	-40 °C...+230 °C (Article 20099264 is -10 °C to +130 °C)
Viscosity	Max. 600 mm²/s
Ambient temperature	-10 °C...+60 °C
Installation position	As required, preferably with actuator upright

Approvals and Conformities

• Pressure Equipment Directive: 2014/68/EU
• Foods and beverages/Hygiene: EC Regulation 1935/2004 of the European Parliament and of the Council (valid for the variable code PL01, PL02). All wetted materials are compliant with EC Regulation 1935/2004/EC according to the manufacturer's declaration.

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 (for Article 20099264)
12	Valve body	Stainless steel 316L/CF3M

Dimensions

Actuator

Note: Dimensions in mm, unless otherwise stated.

Nominal connection size (pipe) DN	NPS	Handwheel diameter ∅ [mm]	B1	H1
15	1/2	45 (S)	148	148
20	3/4	45 (S)	154	154
25	1	45 (S)	163	163
32	1 1/4	110 (M)	224	224
40	1 1/2	110 (M)	224	224
50	2	110 (M)	241	241
65	2 1/2	160 (L)	290	290

Body with Welded Connection

Nominal diameter (pipe) DN	DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B (ES, CS, LS, ∅ DS, WS)	DIN 11850-2 / DIN 11866 series A (ES, CS, LS, ∅ DS, WS)
65	26, 50, 210, 76.1, 2.3	26, 50, 210, 70, 2

(Note: Article 20099264 features SMS 3008 standard, dimensions 63.5x1.6)

Performance Specifications

Flow Characteristics

• Modified equal percentage flow characteristic.
• Higher flow values compared to globe control valves.

Operating Limits

In addition to the maximum operating pressures, the operating range of Bürkert process valves is limited by the nominal pressure according to the relevant standard.

Product Design and Assembly

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

• Cone of equal per cent for valve seat sizes 8 to 100
• Flow characteristic as per DIN EN 60534-2-4
• Theoretical rangeability (Kvs / Kvo): 50:1 for valve seat size 8 to 100

Installation

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.

Install the Actuator on Devices with a Welded Connection

1. Check and replace seal. Make certain that no remnants of seal material get into the pipe system.
2. Grease the external thread of the body connection (e.g. with Klüberpaste UH1 96-402 from Klüber).
3. Screw actuator into valve body, noting the tightening torque (100 Nm ±3 for DN 65).

Set Stroke Limit (Optional)

Setting the minimum and maximum stroke limit is possible as an option. An adjusting sleeve is used for this purpose. Both the minimum and the maximum position of the valve can be adjusted via an adjustment sleeve. The handwheel can be removed for this purpose.

Lock Handwheel (Optional)

It is also an option to lock the handwheel to prevent unintentional or unauthorised operation of the valve. Handwheel sizes M and L can be locked in 13 locking positions per revolution. The locking pin has a bore (Ø 3.8) and can be secured against unauthorised use with a padlock.

Servicing and Maintenance

When used in accordance with the operating instructions, the actuator of the manually operated valve is maintenance-free.

• Perform a visual inspection of the device once per year.
• If leaks occur, replace the respective wearing part.
• Muddy and abrasive media require correspondingly shorter inspection intervals.

TIP

Troubleshooting:

• Valve is not tight: Dirt between seal and valve seat (Install dirt trap); Valve seat seal worn (Install new control cone); Flow direction interchanged (Observe the marking for the flow direction on the valve body); Operating pressure too high (Observe pressure specifications).
• Valve is leaking on the relief bore: Packing gland worn (Replacing packing gland).