The Z91-6933 control valves are supplied with globe body, single seat and quick change type cage trim. They can suit applications which require higher performances than the ones of Z91-6911 series valves provided with conventional trim, mainly for high pressure drops at open and closed valve. The flows is mainly controlled by the special cage drilling, which acts as a continuous and full plug guide along the whole valve travel. Furthermore the high pressure recovery factor value allows to obtain higher flow rates, the Cv factor being equal, and to reduce the cavitation risk on liquid service. On gas and vapour service the single cage Z91-6933 valve is less noisy, compared with an equivalent version provided with conventional trim and operating under the same conditions. Furthermore low noise trims are available, which further reduce the noise generated by the valve, and multicage trims for service on cavitating fluids ot on high differential pressures.
TECHNICAL DATA
Valve
Body materials
type:
Gobe, single port, not invertible. struction:
Cast. material:
standard from stock:
carbon steel WCB type and AISI 316 stainless steel
other materials on request:
carbon steel LCB type, Cr-Mo alloyed steels, AISI 316L stainless steel sizes:
1'' through 16'' connections:
screwed ANSI B2.1 up to DN 2'' included
UNI, ANSI, DIN flanged
socket welding up to DN 2'' included
BW ANSI B16.25 butt welding ends ratings:
PN 250 ANSI 1500 for socket welding construction up to DN 2''
PN 100 ANSI 600 for screwed construction up to DN 2''
PN 10/16/25/40/64/100/150/250
ANSI 150/300/600/900/1500 for butt welding and flanged construction
Bonnet
type:
Plain, extended and bellows seal finned on request. construction:
Flanged type, forged or welding assembled. materials:
Same as for body in the coresponding forged or rolled construction. packing:
Graphited teflon split rings or pure graphite rings.
Plug
sizes:
Full or reduced ports as per Cv table. type:
Standard or balanced; balanced with soft seat for 2'' sizes and above. guiding:
By the cage all along the travel materials:
see material list
Seat
mounting:
Free fitted in the body without screwing or forcing.
Centered in the cage to grant the alignment with the plug.
Body and seat coupling sealed by means of a flat gasket. materials:
See material list.
Cage
construction:
Rolled or forged cylinder drilled and tightened between body and bonnet.
Multicage available, beside the standard single cage (standard and low noise type GBR) series. materials:
See material list. drilling:
Linear and exponential characteristics available.
SEAT LEAKAGE (IEC 534-4 classes)
- standard non-balanced construction: class IV.
Class V on request.
- balanced construction with teflon sealing on the plug: class IV.
Class V on request.
- balanced construction with graphite sealing on the plug: class IV.
- balanced construction with graphoil sealing on the plug: class IVS1.
Contact
us
)
)
_z91_6933_e - PDF ( 1.28 MB )
