Flowserve V-370 R3 Edward Valves Manuel d'utilisateur télécharger pdf (Page 18)

EDWARD UNIVALVE USER INSTRUCTIONS ENGLISH 12-13

A105 AND F22 UNIVALVES

Seal weld of A105 (Carbon) and F22 (Low-alloy) Univalves

are made using a “Fillet” weld.

RE-WELDING

• To allow welding gases to escape, do not fully seat or

backseat valve.

• Weld surfaces shall be clean and dry.

• Preheat to 300°F – 400°F.

• Weld A105 Univalves with SFA 5.1 E7018 electrodes and

F22 Univalves with SFA 5.5 E9018-B3 electrodes.

• Deposit weld metal to meet dimensions shown in table

below.

REPLACING THE SEAL WELD UNIVALVES

Univalve Size Min. Leg

Min.

Throat

Min.

Passes

1-1/2 and smaller 3-16 1/8 2

2 (except Class 4500) 1/4 3/16 2

2 (Class 4500 and valves over 2) 3/8 1/4 2

JOINT

Seal welds of F316, F316L and F347 (Stainless Steel)

Univalves are made using a “Canopy” weld.

• Univalves should be prepared for the Joint design shown

below.

RE-WELDING

• To allow welding gases to escape, do not fully seat or

backseat the valve.

• Weld surfaces shall be clean and dry.

• Preheat to 70°F – 150°F.

• Maintain an interpass temperature of 350°F maximum.

• Weld F316 Univalves using SFA 5.9 ER316L bare rod,

F316L Univalves using SFA 5.9 ER308L bare rod and

F347 Univalves using SFA 5.9 ER347 bare rod.

• Deposit weld metal to meet dimensions shown in sketch

below.

F316 AND F347 UNIVALVES

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Flowserve V-370 R3 Edward Valves Manuel d'utilisateur Page 18