Flender GmbH Flender MD Design of the gear un B2-VH18-B Bevel-helical gear boxes B2

Flender/Flender Gear Units/Bevel-helical gear boxes B2

lves. However , repair by welding as per ASME B1.3 is permitted for ast body valves. Such repairs shall be carried out at casting suppliers care only. Repair shall be carried out before any heat treatment of casting is done. Repair welding procedure qualification shall also include impact test and hardness test and shall meet the requirements of clauses 3.4 & 3.6 of this specification, respectively. 4.2 The tolerance on internal diameter and out of roundness at the ends for welded end valves shall be as per applicable connected pipe specification as indicated in Valve Data Sheet. 4.2 When indicated in Material Requisition, valves shall have locking device to lock the valve either in full open (LO) or full close (LC) positions. Locking devices shall be permanently attached to the valve operator and shall not interfere with operation of the valve. 4.2 Valve stem shall be capable of withstanding the maximum operating torque required to operate the valve against the maximum differential pressure corresponding to applicable class rating. The combined stress shall not xceed the maximum allowable stresses specified in ASME Section VIII, Division . In case of power actuated valves, the valve stem shall be designed for maximum output torque of the selected power actuator (including gear box, if any) at valve stem. 5.0 INSPECTION AND TESTS 5.1 The Manufacturer shall perform all inspection and tests as per the requirements of this specification and the relevant codes, prior to shipment, at his works. Such inspection and tests shall be, but not limited to, the following : 5.1.1 All valves shall be visually inspected. The internal and external surfaces of the valves shall be free from any strikes, gouges and other detrimental defects. The surfaces shall be thoroughly cleaned and free from dirt, rust and scales. 5.1.2 Dimensional check on all valves shall be carried out as per the Purchaser approved drawings. 5.1.3 Chemical composition and mechanical properties shall be chec