BURKERT 773813 (Type 2654) is a 2/2-way, 3-piece stainless steel ball valve designed for separating medium flows in a wide range of industrial applications. It features a DN 20 welded connection and is constructed from high-quality stainless steel 1.4435 (316L - CF3M) with PTFE seals. The valve is equipped with a mechanical interface according to ISO 5211, allowing for easy installation of a pneumatic or electric rotary actuator.

Key benefits include low torques, high flow values (straight through bore), high medium pressure tolerance, long service life, and a maintenance-friendly design. It is particularly suitable for application conditions with high thermal loads or aggressive media.

General Technical Data

Feature	Description
Seal Material	PTFE (ball seal), FKM (actuator stem seal)
Body / Ball Material	Stainless steel 1.4435 (316L - CF3M)
Nominal Diameter	DN 20
Medium Temperature	-10 °C to 200 °C
Actuator-side Interface	According to EN ISO 5211

Dimensions (Weld End Variant)

DN	W [mm]	D [mm]	L [mm]	A [mm]	B [mm]	C [mm]	Interface acc. to ISO 5211
20	28.2	20	90	44	9	9	F03/F04

(Note: The 773813 model specifically uses a DIN EN ISO 1127 / ISO 4200 / DIN 11866 Series B 26.9x1.6 connection.)

Performance Specifications

Torques (DN 20)

Torque Type	Value
Breakaway torque	14 Nm
Running torque	9 Nm

Pressure / Temperature Diagram

Installation Instructions

CAUTION: WELDING PREPARATION

To prevent damage to the ball valve and the contained seal, disassemble the ball valve from the pipeline prior to welding.

Disassembling the ball valve for welding:

1. Undo the four body bolts and disassemble the ball valve into three parts.
2. Remove the seal from the connection element.
3. Weld the connection element to the pipeline (e.g., using orbital welding equipment).
4. Assemble the ball valve and fix it into position using the four body bolts.

Note: The heat impact on the seals must not exceed the maximum temperature (+200 °C for the stainless steel valve body). If the seals are exposed to a temperature greater than the maximum temperature during the welding process, all the seals must be replaced with new ones.

Tightening Torques: For DN 20 (Type 2654), the tightening torque of the installation bolts is 20.4 Nm.

Maintenance

The ball valves are maintenance-friendly when operated according to the instructions.

DANGER

Always switch off the pressure and bleed the lines before undoing the lines and valves!

Replacing the ball seal and/or body seal:

1. Move the ball valve to the open position.
2. Undo the body bolts and swivel out the centre part.
3. Move the ball valve to the closed position and remove the ball.
4. Replace the ball seal and body seal.
5. Insert the ball, move the valve to the open position, and tighten the body bolts to the respective tightening torque.
6. Check the ball valve for leak-tightness.