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Linear Control Valves
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Linear Control Valves

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Aeroflow High Performance Control Valves

  • 1 – 16" Valve Sizes
  • ANSI CL 150 – 4500, DIN PN10 – 400
  • Body Material: WCB, C5, WC9, CF8M
  • Cv Range: 0.01 – 3100
  • End Connection: BWE, SWE, RF, RTJ, THD

The unique technology of the Aeroflow begins with aerodynamic vanes cast into the valve body inlet and outlet. Inlet vanes help divert incoming flow evenly around the cage, minimising turbulence and flow instability as well as improving flow capacity. Outlet vanes minimise turbulence to reduce noise and body erosion. A wide range of interchangeable trim option and custom characterised cages provide the flexibility of many sought after benefits.

Unlike competitive valves rated for class IV, V or VI shut-off, Aeroflow’s pressure energised pilot balanced plug provides zero cc/min. leak rates, without the penalty of huge actuators, even with metal to metal seats at full body pressure/temperature ratings. Aeroflow’s shut-off capability is in a class all it’s own. The pilot balanced plug design minimises actuator size and cost. Proven pilot design also eliminates the need for any piston seals to ensure tight shut-off, greatly increasing the valve’s reliability.

wpeA.gif (27981 bytes)Parts Interchangeably
With the exception of bodies, all parts are interchangeable between globe and angle body styles of the same size and function. Facilities needing various trim designs in both globe and angle style bodies can minimise parts inventories, maintenance and training.

Tri-Sheer Protected Seat Design
Proven in more than 20 years of power plant service, Leslie’s "protected" seat design protects Aeroflow’s superior shut-off characteristics in three ways. First, the protected seat prevents high velocity transients at opening or closure of the valve. Secondly, a five-stage pressure drop occurs near the seating position and last, the plug/seat surface is withdrawn from the direct flow to prevent direct particle impingement or clamping. The Tri-Sheer allows prolonged throttling at the seat without wire draw due to high clearance flow velocities.

Quick-Change Seat Design
In 4 – 16" body sizes, Aeroflow’s seat ring is not threaded, welded or loaded in place by the cage. Seat retention and seat gasket loading are accomplished with a stainless steel load ring and multiple silver-plated load screws for controlled seat gasket loading which is impervious to heat shock.

Hung Cage for Thermal Expansion
The quick-change seat features a cage which is hung in the body. This allows the cage to expand freely through sudden wide variations in fluid temperature. This tolerance for cage expansion solves the typical problems seen in cage retained designs such as cage warping, plug binding, galling and crushed gaskets.

Class GTB Double-Seated 

  • 1 –16" Valve Sizes
  • ANSI CL 125 – 600
  • Materials: Cast Iron, WCB, WC9, CF8M
  • Cv Range: 0.1 – 2760
  • End Connection: RF, RTJ, THDwpe12.gif (30389 bytes)


wpe11.gif (7206 bytes)In dirty, sticky and erosive applications, where cage guided valves fail, plug characterisation, stem guiding and balancing effect give the double-seated GTB design the best combination of features to succeed.

Since inlet pressure exerts force on the upper and lower plugs, the forces are balanced. The balancing effect reduces the net thrust required to move the plug, allowing for smaller actuators to be used in higher pressure drop applications and resulting in lower overall installation cost and dimensional envelope.

Two Point Guiding
The GTB valve plug is supported and rigidly guided by upper and lower guide bushings. This provides exceptional stability and minimal valve plug deflection even under high pressure drop conditions and allows precise control and characterisation of fluid.

Field Reversible Plug
The Equal Percentage V-Port, Equal Percentage Contoured, Linear Contoured and Quick Opening plugs are easily reversed in the field so that either a fail open or closed action can be obtained using the same actuator.

Optional Extended Bonnet
Bonnet options include the standard bolted configuration and extension bonnet for temperatures below 32°F/0°C and above 450°F/232°C.

DBOY-3, DBOYS-3 and DBOS-3 Single-Seated,wpe10.gif (9464 bytes)
Balanced Valves with Cage Throttling Trim

  • 2 – 12" Valve Sizes
  • ANSI CL 150 – 600, DIN PN10
  • Body Material: Cast Iron, WCB, WC9, CF8M
  • Cv: 26 – 1240
  • End Connection: BWE, SWE, RF, RTJ,THD

These Leslie control valves are rugged, reliable units specially designed for use in steam, water, gas, vapour and non-corrosive liquid service. The balanced cage-throttling design permits these valves to be operated with small, compact and economical actuators against fluid pressure drops up to 1480 psig 800°F/426°C (subject to body pressure/temperature ratings and actuator limits).

Hung-Cage Construction
A Unique hung-cage throttling design eliminates gasket damage and body or seat leaks due to thermal expansion. Anti-cavitation (Les-Cav) and low-noise (Les-Sonic) cages are available for special situations. Cages and trim material are 400 series stainless steel with optional Stelliteâ hard facing available.

Standard valve packing is braided Teflonâ graphite. Teflonâ Chevron and laminated graphite is optional for higher temperature service.

Easy Maintenance
The cage trim is easy to remove for inspection or replacement. There is no welded, screw in or press fit parts. Capacity changes are achieved simply by replacing the cage. There’s no need to replace any other parts or add any adapters.

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Copyright © 1998 DS CONTROLS
Last modified: September 18, 1998