IMER – Booster 20 | 28 HP Piston Pump with “S” Valve – 1106427 is a compact, towable, high‑performance diesel concrete pump engineered to deliver up to 20 cubic yards per hour of concrete, shotcrete, and high‑strength grouts while working in tight job sites where other pumps cannot fit. Driven by a 28 HP three‑cylinder Yanmar diesel engine and a two‑cylinder hydraulic piston pumping system with an “S” valve, this machine combines power, reliability, and smooth concrete flow for demanding commercial and industrial projects.

Overview of the IMER Booster 20 – 28 HP Piston Pump with “S” Valve – 1106427

The IMER Booster 20 (formerly known as the Booster 15 in earlier branding) is a diesel concrete piston pump designed for concrete, shotcrete, and high‑strength grouts with aggregates up to 1 in. Its compact towable frame lets it operate in confined areas, such as urban jobsites, alleyways, and congested plants, while still delivering production rates typically associated with much larger pumps.

Model 1106427 is the 28 HP Piston Pump with “S” valve configuration marketed as IMER – Booster 20 | 28 HP Piston Pump with “S” Valve. The “S”‑valve concrete pumping system, automatic greasing, vibrating hopper grid, and heavy‑duty 4 in outlet are all designed to handle harsh mix designs and continuous duty cycles.

Key Technical Specifications

According to IMER USA and the Booster 20 product sheet:

• Model: Booster 20

• Model number: 1106427

• Pump type: Two‑cylinder piston pump with “S” valve and hydraulic control

• Engine: 3‑cylinder Yanmar 3TNV80F‑SMIMI diesel, liquid‑cooled

• Installed power: 28 HP

• Max aggregate size: 1 in

• Flow rate (variable): 3 – 20 cu yd/hour

• Maximum pumping pressure: 1,000 psi

• Pipe outlet: Heavy‑duty 4 in outlet/manifold

• Hopper capacity: 7 cu ft

• Loading height: 42.5 in (42‑1/2 in)

• Dimensions (W × L × H): 58 in × 161 in × 60 in

• Weight: approx. 3,100 lb

This combination of 28 HP power, 1,000 psi pressure, and 3–20 yd³/h flow enables the IMER – Booster 20 | 28 HP Piston Pump with “S” Valve – 1106427 to support everything from small pours to continuous shotcrete and grout pumping on multi‑story projects.

Piston Pumping System with “S” Valve

The heart of the Booster 20 is its two‑cylinder piston pumping system with an “S”‑valve concrete distribution assembly.

• Two‑cylinder piston system: Alternating pistons draw concrete from the hopper and push it into the delivery line, producing a strong, continuous flow.

• “S”‑valve: The S‑shaped valve alternates connection between the pumping cylinders and the delivery pipeline, managing high‑pressure flow of concrete with up to 1 in aggregate.

• Automatic clearance compensation: The S‑valve is equipped with an automatic compensation system for clearance and wear, helping maintain sealing efficiency as parts wear in service.

• Hydraulic system with reverse: The pump includes a hydraulic reverse function to help clear blockages or back‑charge the hopper when needed.

This S‑valve piston design is standard on modern concrete pumps because it handles stiff mixes and larger aggregates more reliably than simple swing‑tube designs.

Diesel Engine, Hydraulic Control, and Performance

The IMER Booster 20 is powered by a 3‑cylinder Yanmar diesel engine rated at 28 HP, mounted in a compact engine bay with liquid cooling for long duty cycles.

Key performance aspects:

• 3‑cylinder liquid‑cooled Yanmar diesel ensures fuel efficiency, low vibration, and long engine life.

• Hydraulic control system drives the two pumping cylinders and S‑valve with smooth, adjustable motion.

• Flow rate is infinitely adjustable within the 3–20 cu yd/hr range, letting the operator match output to placement crew speed and hose size.

• 1,000 psi maximum pumping pressure gives enough force to push concrete, shotcrete, or high‑strength grouts through long runs of 4 in line with 1 in aggregate.

This makes the IMER – Booster 20 | 28 HP Piston Pump with “S” Valve – 1106427 suitable for large slabs, structural elements, shotcrete walls, and high‑lift grouting applications.

Hopper, Vibrating Grid, and Concrete Handling

The Booster 20 features a 7 cu ft concrete hopper with integrated agitator and vibrating grid.

Hopper and feed system features:

• 7 cu ft capacity helps maintain a consistent feed of concrete to the pistons.

• Concrete hopper with agitator keeps the material moving, preventing segregation and bridging.

• 12V vibrating grid over the hopper breaks up clumps, screens out oversized material and debris, and reduces the risk of blockages entering the pump.

• 42.5 in loading height works well with most truck chutes, skid steer buckets, and site mixers.

Together, these features ensure that the concrete entering the pumping cylinders is well‑conditioned and free from obstructions that could damage the pump or cause line plugs.

Towable Chassis and Compact Footprint

Despite its performance, the Booster 20 is built on a compact towable chassis.

• Dimensions: approx. 161 in long × 58 in wide × 60 in high, with a low center of gravity for towing stability.

• Weight: about 3,100 lb, allowing towing with many three‑quarter‑ton and one‑ton trucks within rated limits.

• Heavy‑duty highway tow package: Factory‑equipped for highway travel, including lights, safety chains, and hitch.

• Articulated tow bar: Adjustable to fit various hitch heights (noted in IMER’s spec sheet).

IMER notes that this compact towable high‑performance diesel concrete piston pump can operate in jobsite areas “where no other pumps of its capability could fit.” This makes it particularly valuable for tight urban jobs and plants with limited access.

Standard Equipment Included with the Booster 20

IMER USA lists an extensive package of standard equipment supplied with model 1106427:

• 3‑cylinder liquid‑cooled diesel engine (Yanmar 3TNV80F‑SMIMI).

• Automatic greasing system for critical pump components.

• Concrete hopper with agitator.

• 12V vibrating grid (hopper screen).

• Hydraulic system with reverse function.

• Pumping unit with S‑valve and automatic clearance and wear compensation.

• 4 in heavy‑duty delivery manifold / pipe outlet.

• Stainless‑steel control panel with electromechanical controls and hydraulic gauges.

• Piston head installation and extraction tool kit.

• Heavy‑duty highway tow package.

• Accessory box with grease pump.

• Centralized grease ports (for simplified maintenance).

• 4 in cleaning balls (for line clean‑out).

This standard kit ensures that the IMER – Booster 20 | 28 HP Piston Pump with “S” Valve – 1106427 arrives ready for serious concrete pumping work with minimal additional purchases.

Optional Equipment and Upgrades

IMER and dealers also offer various optional accessories to extend the Booster 20’s capabilities:

• Hydraulic power washer kit (Part #1107208) for cleaning the hopper, pistons, S‑valve, and hoses.

• 5‑function radio remote (Part #1107001) for wireless control of pump start/stop and speed from the pour location.

• 4‑function wired remote control (Part #1107086) for tethered operation.

• Rubber hopper extension kit – 13 cu ft (Part #1107196).

• Steel hopper extension kit – 17 cu ft (Part #1107197).

Remote controls are particularly helpful when pumping long distances or shotcreting, as the nozzleman can control the pump without relying on hand signals and radios. Hopper extension kits are useful when feeding from smaller onsite mixers or when pour rates require a larger buffer volume.

Typical Applications for the Booster 20

Due to its 1 in aggregate capability, 20 yd³/hr maximum flow, and 1,000 psi pressure rating, the IMER Booster 20 is suited to a wide range of concrete and grout applications:

• Concrete pumping:

  • Slabs on grade, foundations, structural elements, and beams.

  • Long‑run line pumping on residential and commercial projects.

• Shotcrete:

  • Structural shotcrete walls, pools, tunnels, and soil stabilization when paired with an appropriate air system and nozzle.

• Grouting:

  • High‑strength grouts for block cores, columns, beams, and industrial bases.

• High‑strength and specialty mixes:

  • Fiber‑reinforced concretes and grouts within the 1 in aggregate limit.

Its compact footprint allows it to be used on dense urban sites, inside plants, and on tight access projects where full‑size boom pumps and large line pumps cannot fit.

Maintenance, Automatic Greasing, and Durability

IMER designed the Booster 20 to be rugged and relatively easy to maintain for a piston pump.

• Automatic greasing system: Keeps critical wear parts (like the S‑valve and pistons) lubricated automatically, reducing manual greasing intervals and wear.

• Centralized grease ports: Allow any manual greasing to be done from accessible points instead of multiple scattered fittings.

• Stainless steel control panel with hydraulic gauges: Gives quick feedback on operating pressures and system status.

• Piston head installation/extraction kit: Included to simplify piston maintenance and replacement when required.

Using the supplied cleaning balls and, optionally, a hydraulic power washer, crews can clean the pump and lines at the end of each day, which is essential for long service life in concrete pumping.

Why Choose IMER – Booster 20 | 28 HP Piston Pump with “S” Valve – 1106427?

IMER – Booster 20 | 28 HP Piston Pump with “S” Valve – 1106427 is an outstanding choice for contractors who need a compact yet powerful diesel concrete pump capable of delivering up to 20 cubic yards per hour of concrete, shotcrete, and high‑strength grouts with 1 in aggregate. Its 28 HP Yanmar engine, two‑cylinder piston pumping system, 1,000 psi pressure rating, 7 cu ft hopper with agitator and vibrating grid, and heavy‑duty 4 in outlet give it the strength and reliability demanded on modern job sites.

With standard automatic greasing, S‑valve with automatic clearance compensation, stainless control panel, cleaning tools, and highway tow package—and optional radio remote, hopper extensions, and power washer—the Booster 20 offers a complete, professional‑grade solution for high‑performance concrete, shotcrete, and grout pumping in tight spaces and demanding conditions.