Emerson Fisher OS2 Instruction Manual page 6

Type OS2
DOWnSTrEaM SEnSing LinE
OPTiOnaL STrainEr
UPSTrEaM
BLOCK VaLVE
TyPE OSE
SLaM-SHUT VaLVE
E0560
OVErPrESSUrE anD UnDErPrESSUrE SHUTOFF
USing OnE ManOMETriC DEViCE
DOWnSTrEaM SEnSing LinE
OPTiOnaL STrainEr
UPSTrEaM
BLOCK
VaLVE
TyPE OSE
SLaM-SHUT VaLVE
E0562
OVErPrESSUrE anD UnDErPrESSUrE SHUTOFF
USing TWO ManOMETriC DEViCES
activates the second stage, releasing the slam-shut valve
plug. A tight and total shutoff is ensured by the plug seal
O-ring closing on the orifice and is helped by the "dash pot"
effect between the bonnet skirt and the valve plug. A "dash
pot" effect occurs when the valve plug closes by having both
the closing spring and the inlet pressure pushing on top of
the valve plug. This is accomplished by ports around the skirt
of the bonnet allowing inlet pressure above the valve plug.
installation*
Warning
!
Personal injury, equipment damage or
leakage due to escaping gas or bursting
of pressure-containing parts may result
if the slam-shut valve is installed where
its capabilities can be exceeded or where
*For further instructions on Types EZR, EZH and EZL, refer to the corresponding instruction manual of these products.
6
UPSTrEaM
BLOCK VaLVE
BLOCK
VaLVE
PrESSUrE
rEgULaTOr
E0561
UPSTrEaM
BLOCK
BLOCK
VaLVE
VaLVE
PrESSUrE
rEgULaTOr
E0563
Figure 4. Typical Installations
conditions exceed any ratings of the adjacent
piping or piping connections. To avoid this,
install the slam-shut valve where service
conditions are within unit capabilities and
applicable codes, regulations or standards.
additionally, physical damage to the
slam-shut valve could break the mechanism
box off the main valve, causing personal
injury and property damage due to escaping
gas. To avoid such injury or damage, install
the unit in a safe location.
installation, operation and maintenance
procedures performed by unqualified
personnel may result in improper adjustment
and unsafe operation. Either condition may
result in equipment damage or personal
injury. Use qualified personnel when
installing, operating and maintaining the unit.
DOWnSTrEaM SEnSing LinE
OPTiOnaL STrainEr
TyPE OSE
SLaM-SHUT VaLVE
MiniMUM/MaXiMUM UPSTrEaM anD
DOWnSTrEaM PrESSUrE
DOWnSTrEaM SEnSing LinE
OPTiOnaL
EXTErnaL TriP
STrainEr
PrESSUrE
TyPE OSE
SLaM-SHUT VaLVE
EXTErnaL SignaL
BLOCK
VaLVE
PrESSUrE
rEgULaTOr
BLOCK
VaLVE
PrESSUrE
rEgULaTOr