Always in Control
Armstrong offers a broad range of rugged, dependable flow control products and accessories—all manufactured according to the highest standards and engineered to provide precise fluid management and smooth, responsive operation to meet the toughest demands of your facilities and environment.
Only From Armstrong—AEROFLOW®, D-Boy™, DLO™, K-Max™, DSE, DOS, and DOT™ Control Valves (formerly Leslie Controls)
The name has changed to Armstrong, and the color has changed to yellow, but the exceptional quality is the same—backed by the outstanding service, technical support and expertise Armstrong is known to provide.
Leslie Controls former legacy brands AEROFLOW®, D-Boy™, DLO™, K-Max™, DSE, DOS, and DOT™ Control Valves are now available exclusively from Armstrong International.
- Armstrong owns the exclusive rights to manufacture these Leslie Controls legacy brands and legacy brand OEM spare parts, adhering to the original specifications and drawings.
- Armstrong and its contractual representatives have exclusive rights to sell these legacy brands and support the install base.
- Armstrong is the exclusive owner of all technical details to include engineering and design of legacy Leslie Control Valve product lines.
AEROFLOW® Series Severe Service Control Valve
AEROFLOW® high-performance, super-critical use control valves (formerly Leslie Controls) deliver superior accuracy and reliability for critical service applications, guaranteeing zero leakage with metal-to-metal seating and temperatures above 1200°F/650°C.
D-Boy™ Series Control Valve
Designed for durability, D-Boy™ Series medium-duty globe control valves offer improved flow capacity and easy maintenance.
DLO™ Series General Service Globe Control Valve
Compact and designed for easy maintenance, DLO™ Series (S)-2 cage-retained control valves offer general purpose control of clean, dirty, viscous or corrosive liquids, and medium pressure clean or dirty steam and gas service.
K-Max™ Control Valve
K-Max™ Eccentric Plug Rotary Globe Valves feature eccentric rotary plug action, bi-directional flow capability, economical design, rangeability, self-aligning orbital seat and an extraordinary flow control capacity.
DSE Series Heavy Duty Globe Valve
Heavy duties control valve with enhanced severe service design, improved flow capacity and easy maintenance.
DOS and DOT Control Valves Obsolescence and Replacement Guide
DOS and DOT Series Control Valves are no longer produced, however, Armstrong does provide new valve sales, engineering, aftermarket and spare parts support. While non-OEM parts may offer an initial price advantage, using them can result in unplanned downtime, premature failure, and higher ownership costs because they often lack the precision engineering, material integrity, and required compliance for critical applications.
Learn More About DOS and DOT Replacement and Aftermarket Support
Delta2 Control Valves
Delta2 began its journey in Italy in 1986, driven by a team of experienced specialists in industrial valve engineering and manufacturing. Through ongoing research and development of innovative technologies, the company’s product portfolio continued to improve and expand. Delta2 was fully integrated into the Armstrong product porfolio in 2017.
FLY Series Control Valve
Built for light-medium duties, Armstrong FLY Series (Delta2) general service, multi-use control valves deliver consistent performance, durability, and easy maintenance for various market sectors.
SMD Series 3-Way Control Valve
Suitable for various market sectors, SMD Series 3-Way Globe Control Valves (Delta2) for mixing or diverting service provide enhanced flow control, and high flow and low-pressure recovery. Available with pneumatic, electric and hydraulic actuators besides full range of accessories.
DRP Series Internal/External Piloted Control Valve
DRP Series (Delta2) Globe Self-Actuated Pressure Reducing/Relief Control Valves are designed for a wide range of process applications.
Python® 1500 Series Control Valves
Python® 1500 Series Globe 2-Way Single Seated Design Control Valves deliver accuracy and efficiency for most steam and liquid applications.
Actuation
| Product Type | Sizes | Description | Features | Material | Pressure |
| D-Boy™, DLO™ Spring and Diaphragm Series Actuators | 35, 55, 85, 135 | Armstrong spring and diaphragm actuators are rugged, high-thrust units with flanged yoke to bonnet connections for simple maintenance and better access to stem packing. These control valve workhorses have been proven and perfected during nearly 40 years of in-service usage. Available in the following sizes: 35 in (890 mm), 55 in (1,400 mm), 85 in (2,160 mm), and 135 in (3,430 mm). | Compact with strength to deliver quick, accurate control. Rugged cast iron or aluminum yoke with steel covers for long, trouble-free service. | Aluminum, Cast Iron | Max air pressure 60 |
| AEROFLOW® Magnum Series Piston Actuator | 6, 10, 13, 16, 20 | Magnum Series piston actuators use low volume and long stroke to maximize bleed and feed rates. Externally mounted spring return modules minimize residual volume and maximize speed of response. The High-Capacity Smart positioners we use, provides ultra-fast, stable response using internal XL air supply conduits suitable also for large piston actuators. Our positioner supplies a digitally controlled pneumatic output and Pro-Diagnostics can be requested to provide extremely precise and high performances of the system against super-critical duties. | Higher working thrust capability, severe service actuation line, long stroke to 7 in (180 mm) or greater, reverse option with double-acting spring return, manual override AEROFLOW® control valve with 6 in (150 mm) Magnum actuator, stroke speed can exceed 3 in (75 mm) per second. | Aluminum, Cast Iron | Max air pressure 150 |
| FLY-GS, FLY, DSE, AEROFLOW® MS Spring and Diaphragm Series Actuators | 22, 29, 37, 44, 44L | Armstrong MS Multi-Spring actuators have been designed for the most demanding applications in Oil & Gas and Power market and beyond. Made of steel materials with several spring ranges to optimize the air consumption and obtaining the necessary thrust for each application. | Heavy-Duty Multi Spring actuators with extended stroke range from 5/8 in (16 mm) to 4 in (102 mm). Designed with NAMUR cast yoke for Universal accessories installation and Lateral Handwheel as recommended in the most severe environments. | Steel, Stainless Steel, Cast Iron yoke | Max air pressure 62 |
Aftermarket Solutions
From identifying the best solution to fulfill your valve requirements and determining cost of ownership through implementation and expert aftermarket support, Armstrong does it all. Our experts work with you to take everything into consideration, including:
- Installation costs
- Industry and application requirements
- Options for repair or replacement
- Product life cycle
- Maintenance requirements
- Technical support
- OEM parts
- ROI