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Standard Design
| 1.
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Differential
piston style construction permits valve operation
without inducing undue stress on moving parts. |
| 2. |
Supported
cup design provides superior longevity, even under
severe pressure conditions. |
| 3. |
Indicator
rod shows position of valve piston at a glance.
|
| 4. |
No
metal to metal bearing surfaces to wear or foul.
|
| 5. |
One
moving piston positioned entirely by internal hydraulic
forces — requires no motor, operating cylinder,
diaphragm, cams, levers, gear trains, or springs. |
| 6. |
Fully-ported
seat ensures that the valve allows maximum flow,
for greater capacity and lower head loss. |
|
Superior
Features
Main
valve is not subject to sudden failure.
Piston
movement is gradual and positive, preventing water hammer.
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|
Standard
Operating Principles
All Ross Valves operate with the same basic hydraulic
principles and are composed of two essential parts:
the main valve (through which the main flow of water
passes), and the externally piped control device.
The
fundamental design of the main valve consists of a shaft,
which carries a seat disc located between a large piston
above, and a smaller piston below. These pistons ride
along the axis in replaceable cylinders to act as guides
to absorb and counteract the lateral thrust generated
by the flow through the valve. The versatility of the
piston unit, along with the variety of seat disc options,
allows Ross Valve to build a product that precisely
meets your control requirements.
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Valve
Open
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Valve
Closed
|
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The
control device is piped externally and may be varied
to suit the various applications. In practice, it can
either be electrically or hydraulically actuated, throttling
or non-throttling, but its basic function is to control
pressure in the chamber above the main valve piston,
to dictate when the main valve opens and closes.
Variety
of Seat Types
To
provide the best flow characteristics for each intended
application, Ross Valve provides a variety of seat styles
and cushion plugs. Eight basic designs are currently
available: flat plain, flat parabolic, flat sawtooth,
clifton, anti-cavitation, slide plain, slide sawtooth,
and slide parabolic.
The
different seat types vary in shape, length, open area,
and pattern in order to accommodate particular needs.
If operating conditions drastically change (if a valve
is moved to a different location or required for a different
application), other style seat skirts are interchangeable
with the original.
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