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CROWN Check Valve
Accessories
|
| Lever Lock
Assembly (Lock Open Assembly)
The
External Lever Lock Clapper assembly provides a means for the
customer to hold the clapper in the full open position (out of
the flow stream) during the passage of pigs and spheres,
during normal operating conditions when the customer wants to
eliminate clapper movement (interference) or during reverse
flow operations.
The external Lever Lock
assembly should not be used to lock the |
| clapper assembly the
closed position as damage to the valve components can
result. For special instances (very low pressures), the
Lever Lock assembly may be utilized to hold the clapper in the
closed position for short periods of times. However,
this should not be attempted without first consulting the
factory. |
 |
| An external Lever Lock assembly is strongly
recommended during the passage of pigs and spheres,
particularly during the passage of smart
pigs. | |
| Vertical Flow Swing Check Valves
Crown Swing
Check Valves can be supplied for use in vertical flow-up or vertical
flow-down service conditions. It is necessary to specify the
intended orientation when ordering to ensure the valve operates
properly and meets the customer's operating
requirements. |
Proximity
Switches
A
Proximity Limit Switch can be used to provide an input signal
to a process control with either an open or closed
indication. Designed and built to rugged specifications
for use in the most industrial and environmental
applications, each switch is
totally enclosed, hermetically sealed and capable of operating
in hazardous locations. |
 | |
|
Rovane Slam
Retarders
|
 |
Crown Rovane
Slam Retarders provide a dependable and efficient torque for
controlling clapper slam and flutter. Long trouble-free
service is assured through the simple and rugged construction
and the basic engineering premise of the Slam Retarder.
It can also be equipped with a limit switch to indicate the
clapper open position at any
angle. |
|
Counterbalance Arms and Weights
(Counter Weight
Assembly)
Counterbalance Arms and Weights can be provided to assist in
either valve closing or valve opening, or when the valve is
being installed in the vertical flow-down
position. |
|
Valve Closing: When
the counterbalance assembly is utilized in valve closing, the
counterbalance assembly is designed and orientated to ensure
positive shut-off.
Valve Opening: When the counterbalance assembly
is utilized in valve opening, the |
 |
| counterbalance assembly is designed and
positioned to counteract a portion of the clapper assembly
weight to allow the clapper assembly to float on the flow
stream, thus reducing the pressure drop on the
valve.
Vertical Flow-down: For valves installed in the
vertical flow-down position, the counterbalance assembly is
designed and positioned to assist in returning the clapper to
the closed position ensuring a positive
shut-off.
When a
counterbalance assembly is required, it is recommended to
specify the intended positioning to ensure proper orientation
and valve
operation. | |
|
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