2
Penberthy
SErIES 500 and 700 OS&Y armOrEd gagEcOckS
InstallatIon, operatIon and maIntenance InstructIons
2 IntrOduCtIOn
Penberthy armored OS&Y gagecocks are used
to connect gage glass, magnetic gages or other
apparatus to the holding or pressure vessel.
Penberthy Series 500 and 700 OS&Y gagecocks
are supplied in pairs (upper and lower) and are
available with socketweld, flanged and nPT
connections.
These gagecocks are equipped, as a standard
feature, with an outside screw and yoke and
with ball check shut-off to reduce leakage
of contained fluid in case of accidental gage
glass breakage. The outside screw and yoke
gagecock is designed for use where it is
necessary to have external stem threads due to
pressure, temperature or corrosiveness of the
contained fluid. all models have a solid shank
vessel connection.
2.1 system description
Penberthy armored gagecocks comprise seven
basic components. Each component may vary
slightly, depending on the desired physical
and mechanical properties for the gagecock.
Use the exploded parts views in Sections 12
and 13 as additional reference material. The
OS&Y gagecock operation differs from standard
armored process gagecocks in that the threads
are external to gagecock operation. The stem
reciprocates rather than rotates (screws) as it
seats inside the gagecock body.
body:
a pressure retaining structure through
which fluid passes to enter a gage glass or
other apparatus. Provides a rigid connection
to the vessel and seating surfaces for most
gagecock components. Series 500 is straight
pattern body; Series 700 is offset pattern body.
trim:
wetted parts that control the fluid path
from the vessel to the gage glass or other
apparatus mechanically. The ball and stem act
to seal and release the liquid. In the event of
mechanical failure, the ball will seat to prevent
large quantities of the contained fluid from
exiting the vessel. Fluids are allowed to exit the
vessel into the gage glass or other apparatus
when the stem is pulled away from its seated
position. The fluids are sealed when the stem
is pushed into its seated position.
The stem packing retainer provides a
compression surface between the process
fluid and the stem packing. a stem packing
gland is used to compress the packing against
the retainer and around the stem to prevent
leakage.
stem packing:
under compression the stem
packing is forced to mold around the stem and
prevent leakage of media during operation.
(Series 550 and 750 Fugitive Emission
gagecocks use specific packing materials
of construction to prevent vapor or gaseous
leakage).
Gage connection:
provides connection between
the gagecock and the gage glass or other
apparatus. a union, spherical union or rigid
connection may be used. a union connection
can move in a plane parallel to the vessel
connection. The connection can be threaded,
flanged or welded. (Series 550 and 750 Fugitive
Emission gagecocks require rigid gage
connections only).
handwheel/lever:
rotated to engage threads
and provide reciprocating action of stem.
yoke:
seals and supports the stem packing
during gagecock operation. The yoke contains
the stem packing to prevent gagecock leakage.
The yoke is sealed with a gasket as it is
compressed against the gagecock body using
screws. (Series 550 and 750 Fugitive Emission
gagecocks use an O-ring between the yoke and
body to prevent fugitive emissions). Threads in
the yoke provide the torsional base that pushes
and pulls the stem when the gagecock is closed
and opened.
ball checks:
sphere installed loosely within
the body of the gagecock that seats to prevent
significant leakage when a differential pressure
surge occurs (e.g., mechanical failure). Ball
checks for aSmE steam service incorporate
a vertically rising lower and leaky horizontal
upper or omit ball checks completely. 'reverse
acting' ball checks are available for vacuum
service.
1 abOut the Manual
This manual has been prepared as an aid and
guide for personnel involved in installation or
maintenance. all instructions must be read and
understood thoroughly before attempting any
installation, operation or maintenance.
saFety InstruCtIOns
Emerson does not have any control over the
manner in which its gagecock set is handled,
installed or used and Emerson cannot and does
not warrant or guarantee that a gagecock set
is suitable or compatible for the user's specific
application.
WarnInG
Vessel fluids may be pressurized in the gage and
can exit vessel connections unexpectedly due
to apparatus or material failure. Safety glasses
should be worn when installing a gagecock.
Failure to follow any instruction could result in
a malfunction of the gagecock with resulting
sudden release of pressure, property damage
and/or physical injury.
