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, minimizing turbulence and
flow instability as well as improving flow capacity. Outlet vanes
minimize turbulence to reduce noise and body erosion. A wide range
of interchangeable trim options and custom characterized
cages provide the flexibility of many sought after benefits.
Shut-Off (exceeds ANSI Class VI)
Unlike competitive valves rated for Class IV, V, or VI shut-off,
Aeroflow's pressure energized pilot balanced plug provides zero cc/min.
leak rates, without 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 its own. The pilot balanced
plug design minimizes actuator size and cost. Proven pilot design
also eliminates the need for any piston seals to insure tight shut-off,
greatly increasing the valve's reliability.
With the exception of bodies, all parts are interchangeable
between globe and angle body styles with the same size and
function. Facilities needing various trim designs in both globe
and angle style bodies can minimize parts inventories, maintenance and
Protected Seat Design
Proven in more than 20 years of power plant service, Leslie's
"protected" seat design protects Aeroflow's superior
shut-off characteristic 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position and last, the plug/seat surface is withdrawn from the direct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 thermal 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.
Custom Characterized Cage Throttling
400 Series stainless steel cages resist warping or deformation and
provides plug/window throttling through closure. The flow window can be
shaped to meet specific Cv requirements and system characteristics. This
custom characterized cage is standard in our Aeroflow control valve line
and is available with all plug/seat options.
Les-Cav Multi-Stage Cage
Les-Cav multi-stage trim is designed to throttle liquids with maximum
pressure drops from 0-4000psi without damaging cavitation and resultant
noise or vibration. Les-Cav is easily tailored to the exact requirements
of each application.
Single stage Les-Sonic cage can provide up to 25 dBA noise reduction
in compressible fluid applications. When combined with a Les-Sonic
Silencing Orifice noise reductions of up to 35 dBA are possible.
Mini-P Multi-Stage Plug
Mini-P multi-stage plug is designed for low-flow high-pressure drop
cavitating services. The unique axial flow design will control
cavitation and the resultant noise, vibration, and valve erosion damage.
The pressure drop is taken along the length of the plug in the milled
slots and chambered liner. The Mini-P can be easily tailored to the
exact Cv requirements of each valve application.
C3 Combination Characterized Cage
Special characterized cages can be designed for applications that
require high rangeability, with low end cavitation protection or low end
noise abatement. This flexibility allows Leslie to provide one valve
where other manufacturers may require two, lowering overall equipment,
installation, and maintenance costs.
Leslie offers it's unique Aeroflow pressure reducing valve in
combination with a state of the art, variable area, mechanically
atomized desuperheating system. This combination system meets today's
stringent requirements for control and turndown without the temperature
stress problems associated with combination valves. We offer complete
fabricated systems that include either Globe or Angle body PRV designs
with noise attenuation plates (as required), customized trim selection
and desuperheating equipment.