Description
mode of action:the
double-acting/singel-acting type(spring reposition)of pneumatic
actuator
control:switch
type,adjust type
selection of
accessories:sonlenoid valve,locator,limit switch,F.R.L,COMBINATION
UNIT,manual device.
Pneumatic ball valve series are widely used in
natural gas,oil,chemical
industry,metallurgy,papermaking,power,mining,printing and
dying,biological pharmacy,daily chemicals,foodstuff and
beverage,water treatment and air treatment ect.For the automatic or
adjustment control of fluid,together with automatic pneumatic
meters.
The structural features of pneumatic ball valves
series:
Pneumatic actuator uses new-style AT pneumatic
actuator,provided with both double-acting types and single-acting
types(spring reposition),driven by gear and rack with high
dependability.Big diameter valves are driven by AW pneumatic
actuator on pull-extraction manner,with reasionable structure and
large output torque as well as both double-acting and single-acting
types(spring reposition).Refer to our stylebook of pneumatic
actuator for more details information.
Shell Structure:As per wseres’requirements and
real working conditions,fixed ball valves cn be designed to three
structure including cast,foeged and fullwelded,and valves of
full-welded structure are mainly applicable for buried
use.
Unique Sealing Structure of Valve Base Floating
ball valve adopts the structure of lip-type elastic sealing ring to
insure the sealing dependability.For ball valves used in
low-tension,ultra-low-tension or vacuum conditions,the valve-base
sealing structure with leaf spring loading is adopted to maintain
long-time reliable sesling.The valve-baseof high –or medium –temperature ball valve may
usepara-position polyphenylene or metal material.
According to the difference in pressure,medium
character and sealing requirements,fixed ball valve may choose
structure of front-ball sealing,back-ball sealing or front-back
double sealing,.The valve base of high-oor medium-temperature ball
valve may use pare-position polyphenylene or metal
material.
Obstruction and Drainage:When valve is io
off-position,the valve bases at upper and lower stream will
interdict the fluid,and the deposit in the cavity may be discharged
by drainage device.
Automatic Pressure-relieving Structure:In case
of abnormal rise of pressure occurred in cloaca cavity,the medium
in it may drive the valve base with its self-thrust to realize
automatic pressure relief,thus to ensure the safely of valve
body.
Reliable Sealing of Stem:Valve stem adopts the
downward installation structure with back sealing.The sealing power
increases along with the rise of medium pressure,thus to ensure
reliable sealing of valve stem.In addition,stem will not burst
forth in case of abnormal pressure rise.
Fireproof Structure:Fireproof structure may be
adopted for ball valve as per working conditions and users’
requirements.The fireproof design conforms to API 6D and JB/T***9
standards etc.In case of soft sealing ring being damaged in
fire,the fireproof structure can stop the large leakage of
medium,thus to avoid further expansion of fire.
Anti-static Structure:When operating,the
friction between sphere and base may cause static charge
accumulated on the sphere.To avoid static spark,static device is
provided in the valve to educt the electric charge on the
sphere.
Full
Bore Structure and Reduced Bore Structure:These two serices are
offered to meet users’ different requirements.The passage inside
diameter of full bore ball valve is the same as that of pipe,making
it convenient for control and cleaning.The weight of reduced bore
ball valve is relativey smaller,but the fluid resistance is only
arund 1/7 of that of stop valve with the same caliber.Therefore
,the application prospect is much better for the latter.
