Not every hydraulic circuit needs high-pressure variable displacement technology — many industrial applications are built around straightforward, reliable, fixed-displacement pumping at lower pressure ranges. KCL’s 50T/150T Series is engineered specifically for these applications, offering dependable fixed displacement performance across a range of standard and combination configurations.

The Case for Fixed Displacement

Fixed displacement pumps deliver a consistent, predictable flow output for a given drive speed, without the added complexity of variable control mechanisms. For circuits where demand is relatively constant, or where the cost and complexity of variable displacement technology isn’t justified by the application’s actual requirements, a well-engineered fixed displacement pump remains the simplest, most cost-effective, and most maintenance-friendly solution.

The 50T/150T Series is built around this principle — delivering the reliability and simplicity that lower-pressure circuits need, manufactured to the same quality standards as the rest of KCL’s product range.

Standard and Combination Configurations

The 50T/150T Series is available in several configurations to match different system architectures:

Standard 50T/150T — the base fixed-displacement configuration, suited to straightforward hydraulic circuits requiring reliable, lower-pressure flow delivery.

50T/150T+VQ15 — a combination configuration pairing the fixed-displacement 50T/150T stage with a VQ15 vane pump stage, allowing a single integrated unit to deliver dual-stage hydraulic output rather than requiring two separately sourced and mounted pumps.

50T/150T+PA — a combination configuration incorporating a PA-type secondary stage, suited to applications requiring a specific auxiliary flow characteristic alongside the primary fixed-displacement output.

50T/150T+TSP — a combination configuration incorporating a TSP-type secondary stage, offering another dual-stage option for system designers with specific auxiliary circuit requirements.

Why Combination Models Simplify System Design

For hydraulic system designers, sourcing a pre-integrated combination unit rather than two separate pumps offers real practical advantages: fewer mounting points to engineer, fewer coupling and alignment considerations, a smaller overall footprint within the power unit enclosure, and — critically — a single point of source and support rather than coordinating compatibility between two independently sourced components.

This matters particularly in applications like machine tools and industrial power units where a primary circuit (such as a main clamping or actuation function) needs to run alongside a secondary, lower-volume auxiliary circuit (such as a pilot or control function) — exactly the kind of dual-stage requirement the 50T/150T combination models are designed to address.

Built to KCL’s Standard Manufacturing Quality

Even though the 50T/150T Series targets lower-pressure applications rather than the high-pressure end of KCL’s product range, every unit is manufactured under the same ISO 9001:2015 certified quality systems, using the same precision machining capability, as our high-pressure vane and piston pump lines. Lower pressure doesn’t mean lower manufacturing standards — it means a product engineered specifically for the requirements of a different application category.

Typical Applications

• General industrial machinery requiring straightforward, reliable low-pressure hydraulic flow
• Machine tools and equipment with dual-stage circuit requirements suited to the combination configurations
• Applications where the simplicity and cost-effectiveness of fixed displacement outweigh the benefits of variable control
• Auxiliary and pilot circuits within larger hydraulic power unit designs

Why Choose KCL’s 50T/150T Series

Sometimes the right engineering decision is the simplest one. When your application calls for reliable, fixed-displacement, lower-pressure hydraulic flow — whether standalone or paired with a secondary stage — the 50T/150T Series delivers exactly that, without unnecessary complexity, backed by the same manufacturing rigor and technical support that defines KCL’s entire product range.

Not sure whether a standard 50T/150T or a combination configuration fits your circuit? Share your primary and any auxiliary flow requirements with our sales team, and we’ll help you identify the right model.