flender himmel distributor H3HH-16-C Helical gear Reduction Box H3

Flender/Flender Gear Units/Helical gear Reduction Box H3

duced OpeningNominal Valve SizeNominal Valve Size for Reduced Opening DN mm (NPS inches) DN mm (NPS inches) DN mm (NPS inches) DN mm (NPS inches) 5 ( 5 ( 6 ( 5 ( 8 (3 ) 5 ( 6 ( 5 ( 1 ( 8 ( 7 ( 6 ( 1 ( 1 ( 7 ( 6 ( 2 ( 1 ( 8 ( 6 ( 2 ( 2 ( 8 ( 7 ( 3 ( 2 ( 9 ( 7 ( 3 ( 2 ( 9 ( 8 ( 4 ( 3 ( 1 ( 8 ( 4 ( 3 ( 1 ( 9 ( 5 ( 4 ( 1 ( 1 ( 5 ( 4 ( 4.5 Ball mounting shall be trunnion / pivot type or as indicated in Valve Data Sheet. Ball mounting, either trunnion or floating, unless otherwise specified, shall be as follows. Valve design shall minimize the possibility of debris ingress into the trunnion as far as practicable.Nominal Valve Size (NPS inches) Sl. No.ANSI Pressure Rating Floating Ball Trunnion Mount ed 1. 1# <8 >8 2. 3# <4 >4 3. 6# Nil >2 9 of 1 STANDARD TECHNICAL SPECIFICATION MECON LIMITED REGD. OFF: RANC HI 8 OIL & GAS SBU, DELHI DOCUMENT NO. Page 9 of2 TITLE BALL VALVE MEC/TS/0/2/0 REVISION : 1 EDITION : 1 4.6 Valve seats shall have metal to metal contact. -rings or other seals, if used for drip tight sealing, shall be encased in suitable groove in such ma nner that it can not be removed from seat ring and there is no extrusion during opening or closing operation of valve at maximum differential pressure corresponding to valve class rating. The seat rings shall be so designed as to ensure sealing at low as ell as high differential pressure . 4.7 Valves shall have double block and bleed feature to facilitate complete flushing, draining and venting of the valve body cavity. 4.8 For valves to be used in liquid service, the body cavity over -pressure shall be prevented by self relieving seat rings /assemblies. pressure relief hole in the ball is not permitted. Self relieving seat rings shall relieve at body cavity diff erential pressure not exceeding 5% of the valve class rating pressure. 4.9 Valves shall be de signed to withstand sustained internal vacuum of at least 1 (one)