Buyers Products K70 Series Single Lever Air Control Valves give you complete control of your pneumatic functions. These stackable valves are available in 3-way (raise, lower, and hold) or 5-way (PTO, raise, lower, inlet, and exhaust functions with a push button auxiliary function) models with 3-position (raise, lower and neutral) controls. Flexible design makes it easy to adapt the control valves to your application . Movement of the handle in either direction allows controlled proportional pressure output to work ports 'A' or 'B' to allow feathering.
Specifications
| Feathering | Yes |
|---|---|
| Number of Ports | 5 |
| Port Type | Brass Push Lock Fittings |
| Rated Pressure | 125 |
| Series | K70 |
| Spring to Neutral / Deadman Control (y/n) | Yes |
| Valve Action | Feather Down |
| Valve Actuation | Manual Lever |
| Valve Primary Application | PTO/Hoist Control |
The Buyers Products K70 Series Single Lever Air Control Valve represents a pinnacle of pneumatic control engineering, specifically designed for demanding applications requiring precision, safety, and robust operation. This specialized 4-way hoist valve, featuring advanced "Feather Down" capability, an integrated PTO output function with automatic kickout on lower, and a critical "Spring Center" design, offers an unparalleled level of command over complex pneumatic systems. Engineered for seamless integration into various mobile and industrial setups, this valve ensures optimal performance for hoist and power take-off (PTO) applications, setting new benchmarks for operational efficiency and safety in the field.
At its core, the K70 Series valve is built around a single-lever actuation mechanism, a design choice predicated on enhancing operator intuitiveness and reducing the complexity associated with multi-function control. Unlike systems that require multiple levers or switches, this single control point allows operators to manage complex pneumatic functions with a simple, fluid motion. This ergonomic advantage translates directly into reduced training times, minimized operational errors, and increased productivity. The manual lever actuation provides tactile feedback, allowing operators to "feel" the system's response, which is crucial for precision tasks.
Central to its capabilities is the designation as a "4-way Hoist" valve. In pneumatic terminology, a 4-way function typically refers to the ability to direct air pressure to two separate work ports (often labeled A and B) and exhaust air from the opposing port, thus controlling the bidirectional movement of a double-acting cylinder. For hoist applications, this translates directly to precise "raise" and "lower" functions, with an inherent "hold" position when the lever is in neutral. The K70 Series excels in this role, offering the granular control necessary for safely lifting and lowering heavy loads. The robust construction and reliable internal components ensure consistent performance even under continuous heavy usage, making it an indispensable component for dump bodies, utility cranes, and other equipment requiring precise vertical positioning.
The standout feature, "Feather Down" capability, elevates this valve beyond conventional on/off pneumatic controls. Feathering refers to the ability to proportionally control the air pressure delivered to the work ports, allowing for infinitely variable speed control during the lowering (or raising) sequence. As the operator gradually moves the lever, the valve progressively opens, modulating the airflow and thus the speed of the pneumatic cylinder. This is achieved by engineered internal valving that creates a controlled restriction, providing a smooth, gradual descent rather than an abrupt drop. The benefits of such proportional control are manifold: it dramatically reduces shock loads on equipment, minimizes wear and tear on mechanical components, prolongs the lifespan of hydraulic cylinders and associated linkages, and, most importantly, enhances safety by allowing operators to precisely position loads without sudden movements. In applications where delicate positioning is critical, such as setting down a utility pole or carefully tilting a dump bed, the feathering function is invaluable, mitigating the risk of damage to cargo or surroundings and increasing overall operational smoothness.
Further enhancing its versatility and utility is the integrated "PTO Output Function." Power Take-Off systems are critical components in mobile equipment, diverting engine power to drive auxiliary hydraulic pumps, air compressors, or other mechanical attachments. This K70 Series valve is specifically designed to engage and disengage the PTO pneumatically. The 5-way configuration (as indicated by the "Number of Ports: 5" specification) facilitates this by providing the necessary ports for pressure input, exhaust, two cylinder ports for hoist control, and an additional port dedicated to PTO engagement. This integrated control simplifies the operator's console, consolidating multiple functions into one cohesive unit. The ability to smoothly engage the PTO is crucial for the longevity of the drivetrain and the PTO unit itself, preventing jarring engagements that could lead to premature wear or failure. This feature makes the K70 Series an ideal solution for vehicles like dump trucks, refuse compactors, snowplows, and various utility and service trucks that rely heavily on PTO-driven auxiliary equipment.
A significant safety and operational enhancement is the "Automatic Kickout on Lower." This advanced feature is engineered to prevent over-extension or unintended lowering beyond a safe or predetermined limit. While the exact mechanism can vary, it typically involves a pneumatic signal or a mechanical linkage that detects when the hoist cylinder reaches its fully lowered position or a critical angle. Upon sensing this condition, the kickout mechanism automatically returns the control lever to the neutral, spring-centered position, disengaging the lowering function. This proactive safety measure prevents damage to the hoist mechanism, the vehicle chassis, and any equipment mounted on the hoist. It eliminates the risk of operator error associated with manual disengagement, ensuring that the system always stops lowering at the appropriate point. For applications such as dump trucks, this feature is critical to prevent the dump body from impacting the chassis or ground during the final stages of unloading, protecting both the equipment and the operator from potential hazards.
The "Spring Center" design, also referred to as "Deadman Control," is a fundamental safety characteristic of this K70 Series valve. This means that when the operator releases the control lever, it automatically returns to its neutral, center position. In this neutral position, all pneumatic ports to the work cylinders are typically blocked, effectively holding the hoist in its current position and preventing further movement. This mechanism is paramount for safety, as it ensures that any interruption to the operator's attention or presence immediately halts the controlled motion. It prevents accidental movement of the hoist or PTO if the operator momentarily steps away or is otherwise distracted. This design principle aligns with rigorous industry safety standards, providing an inherent failsafe that protects personnel and equipment alike, reinforcing the K70 Series' commitment to operational integrity and risk mitigation.
From a technical specification standpoint, the K70 Series valve is designed for robustness and ease of integration. The "Number of Ports: 5" configuration includes a pressure inlet, an exhaust port, two work ports (A and B) for cylinder actuation, and a dedicated port for the PTO function or other auxiliary control. This comprehensive port arrangement allows for sophisticated control within a compact footprint. The "Port Type: Brass Push Lock Fittings" ensures quick, secure, and reliable connections without the need for specialized tools or extensive plumbing. Brass construction offers superior corrosion resistance and durability, critical for pneumatic systems exposed to varying environmental conditions. With a "Rated Pressure: 125 PSI," the valve is perfectly suited for standard vehicle air brake and accessory systems, operating well within typical pneumatic system parameters and providing ample pressure capacity for demanding applications.
The "K70 Series" designation itself signifies a lineage of proven performance and reliability from Buyers Products, a brand synonymous with quality in the mobile equipment industry. The "Stackable" nature of these valves offers exceptional flexibility for system designers. It allows multiple K70 series valves to be ganged together, sharing common inlet and exhaust manifolds, creating a highly modular and expandable control system. This modularity simplifies installation, reduces piping complexity, and allows for future expansion of pneumatic functions without significant redesign. The "Flexible design makes it easy to adapt the control valves to your application" speaks to this inherent adaptability, making the K70 Series a versatile choice for custom configurations and a wide array of vehicle types and operational requirements.
In summary, the Buyers Products K70 Series Single Lever Air Control Valve, with its 4-way hoist functionality, precision feather down control, integrated PTO output with automatic kickout on lower, and crucial spring center safety feature, represents an advanced solution for pneumatic system management. Its thoughtful design, robust construction with brass push lock fittings, and high-pressure rating ensure dependable performance in the most demanding mobile and industrial environments. Whether for dump truck operations, refuse collection, snow and ice control, or any application requiring precise, safe, and efficient control of pneumatic cylinders and PTOs, the K70 Series delivers unparalleled control and reliability, enhancing both operational efficiency and safety protocols across a diverse range of industries.
