Rothenberger 8.7800, Instruction Manual

ENGLISH 

7 

 3 

Installation 

and 

operation 

Valve core installation: 

5/16 „-20 (1/4“FL) Valve core connection 

(Fig. 1A)

1.

Insert the new valve core. 

2.

Tighten the shaft connection nut to the valve body. 

3.

Turn valve lever in the direction of flow so the shaft can go through the body. 

4.

Push the shaft forward and immediately tighten the locking nut to the shaft connection nut. 

5.

Turn the shaft clockwise until the valve core is installed completely. 

6.

Loosen the looking nut and back up the shaft. 

7.

Once the valve core is in place, pull the shaft back and close the valve. 

8.

Remove the shaft from the valve body. 

9.

Slowly open the valve knob to assure the valve core is in place. If the valve is not in place, 
the pressure in the system will dissipate quickly. If so, quickly close the valve and try again. 

Charging system without valve core 

The system can be

“quick charged“

after removal of the valve core. Using manifold gauge set 

with valve lever in closed position, connect the correct charging hose to the valve 

(FIG 2A)

 Open 

the valve and charge the system. After charging, close the valve and disconnect the hose. Proceed 
with valve core installation. 
 

 4 

Disposal 

Parts of the unit are valuable materials and can be recycled. Approved and certified recycling 
companies exist for this purpose. Metals must be sorted and delivered separately to a disposal 
company. 

Please consult your responsible refuse disposal authority for how to dispose of unusable parts in 
an environmentally responsible way (e.g. electronic scrap).