Ross Valve Manufacturing Company, Inc.
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Valve Construction

Standard Design

1. 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.


7. Piston guided above and below seat to insure perfect alignment and overcome lateral thrust.
8. Extra heavy construction with quality materials used throughout.
9. Lower cylinder acts as a guide and hydraulically ensures positive closure of the valve.
10. Variety of seat styles are available to provide the best flow characteristics for each application. "Flat Parabolic" design shown.
11. "Drip-tight" shutoff.

Note: Globe style valve shown. Angle style also available (inlet and outlet ports separated by 90° )

 

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.

Valve Open

Valve Closed

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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