Danfoss SFA 10 Handbuch

027R9981

Fig. 3. Fixation/ Cap removalFig. 2. Unseal SFA

Fig. 1. Repair Kit Content

1 3

25 mm (1”)

Service guide / Repair kit installation

Safety relief valves

SFA 10, SFA 10H

AN352739267283en-000101 | 1

Fig. 5. Unscrew inlet connector

Fig. 4. Loosen locknut/ adjustment screw

6 mm

35 mm

18 mm

AN352739267283en-000101 | 2

Fig. 6. Cone-spindle removal Fig. 7. Cone-spindle replacement

1 3

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Fig. 8. Insert Cone-spindle assembly

Fig. 10. Reset adjustment screw Fig. 11. Calibration Fig. 12. Fasten lock nut

Fig. 9. Reinstall inlet connector

Calibration by authorized

personel

225 Nm

166 ft lb

30 Nm

22.1 ft lb

AN352739267283en-000101 | 4

90 Nm

66.4 ft lb

Fig. 13. Fasten cap Fig. 14. Reseal SFA

In addition to the instructions below, all inspection, repair and recalibration must comply with all local laws and

requirements.

Inspection

When due for service or after the safety valve has been activated it is recommended to disassemble and clean the valve

seat for dirt and particles. The valve must not be disassembled while installed/in operation. Servicing of the valve is only

allowed when valve is dismantled. Apply torque to the inlet body hexagon only and not on the valve body when disman-

tling the safety valve from the changeover valve or pipe ﬁtting. All external sealings must be changed during service using

the 148F3068 SFA 10(H) / DSV 10 inspection kit.

Corrosion

Dust, dirt, corrosion or sticky medias on moving and guiding parts may inﬂuence the valve function negatively. If any part

(including the spring) inside the valve are corroded, the valve should be fully replaced. Dirt and particles must be fully

removed. In extreme environments it is recommended to use a valve with bellow instead. This will protect the valve from

refrigerant contaminated with dirt and particles.

Springs

Observe! When cleaning or replacing the spring, it is very important that the exact same spring type is being used. The

spring type can be identiﬁed by the color of ﬁrst windings. Even though it may be possible to set the correct pressure with

a wrong spring, the opening and closing characteristics may be compromised and may lead to reduced lift, leading to lack

of valve capacity and increased system pressure, increased blowdown, leading to extraordinary loss of charge

Temperature ageing

The O-ring material ages when exposed to atmosphere and/or long-term high temperatures. Max. temperature is 100 °C

(212 °F) during activation. If this temperature is exceeded the valve may not reseat perfectly leading to loss of refrigerant.

At static temperatures above 60 °C (140 °F) the lifetime of the O-ring will be gradually reduced, and the valve should be

serviced more frequently, using Danfoss SFA 10(H) repair kit.

Repairing the SFA 10(H)

The Cone and O-ring can be replaced using one the Danfoss SFA 10(H) repair kits. Observe that the repair kits are covering

diﬀerent set pressure ranges and that purchased repair kit matches the set pressure of the valve to be repaired.

Recalibration and leak test

To verify the valve function after service or inspection following tests should be done by authorized personnel. Danfoss

cannot be held responsible for correct function / set pressure after recalibration.

AN352739267283en-000101 | 5

Fig. 1: Repair Kit content

1. Cone-spindle

2. O-ring inlet connector

3. O-ring cap

Fig. 2: Unseal SFA

1. Cut wire to unseal SFA

Note: Cutting the wire will make any warranty void

Fig. 3: Fixation/ Cap removal

1. Fix the SFA in a vice at this area

2. Unscrew the cap (25 mm or adjustable wrench)

Fig. 4: Loosen locknut/ adjustment screw

1. Loosen locknut 1/2 turn counterclockwise (18 mm socket wrench)

2. Loosen adjustment screw 15-20 turns counterclockwise (Allen key 6 mm)

Fig. 5: Unscrew inlet connector

1. Unscrew inlet connector (35 mm – 6 edge socket wrench or 36 mm – 12 edge socket wrench)

Fig. 6: Cone-spindle removal

1. Carefully take out the insert

2. Place on soft and clean surface

Note: Inspect and clean the valve seat and spring for dirt and particles. Replace the valve if the spring is corroded.

Fig. 7: Cone-spindle replacement

1. Remove loose parts

2. Replace the Cone-spindle

3. Re-assemble loose parts

Fig. 8: Insert Cone-spindle assembly

1. Carefully insert new Cone-spindle assembly

Fig. 9: Reinstall inlet connector

1. Replace O-ring

2. Tighten inlet connector to torque 225 Nm (166 ft lb)

Fig. 10: Reset adjustment screw

1. Fasten adjustment screw 15-20 turns clockwise

Fig, 11: Calibration

Calibration by authorized personel. The following steps (ﬁg.12 to ﬁg.14) must be done by authorized personel

only

Fig. 12: Fasten lock nut

1. Fasten lock nut to torque 30 Nm (22.1 ft lb)

Fig. 13: Fasten cap

1. Replace O-ring

2. Fasten cap to torque 90 Nm (66.4 ft lb)

Fig. 14: Reseal SFA

1. Reseal SFA

AN352739267283en-000101 | 6

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