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Description

The Olsen Controls S-3EF-5.5-70S is a single-stage, digital servo spool valve manufactured by Olsen Controls, Inc. This part is also referenced under the closely related catalog number S-3EF-5.5-70 (without the S suffix). Refer to manufacturer documentation to confirm compatibility with your specific application.

This valve is a Four (4)-way, single-spool design rated at Five-point-Five (5.5) GPM maximum flow. Spool position is driven by an integrated DC stepper motor — the motor receives digital position command signals and translates rotational shaft motion into linear spool displacement via an internal rotary-to-linear mechanism. The drive motor operates at 175 mA. The valve spool is constructed from hardened steel and the valve body from anodized aluminum with a PTFE coating for corrosion and wear resistance.

An internal null adjustment mechanism allows the null (center/closed) position of the stepper motor shaft and valve spool to be aligned and re-calibrated without disassembling the valve body — a key serviceability feature of the Olsen Controls digital servo valve design. This valve interfaces between a hydraulic pump and a linear or rotary hydraulic actuator, with spool position controlling the rate, pressure, and direction of hydraulic fluid flow.

Technical Specifications

Brand: Olsen Controls
MPN: S-3EF-5.5-70S
Alternate MPN: S-3EF-5.5-70
Type: Digital Servo Hydraulic Spool Valve
Valve Configuration: 4-Way, Single Stage
Maximum Flow Rate: 5.5 GPM
Valve Operation: Motorized (DC Stepper Motor)
Stepper Motor Current: 175 mA
Spool Material: Hardened Steel
Body Material: Anodized Aluminum with PTFE Coating
Null Adjustment: Tool-accessible, no disassembly required
Suitable Media: Oil (Hydraulic Fluid)
Country/Region of Manufacture: United States

Condition: New — Open Box. Sourced from manufacturing MRO turnover, plant closures, and industrial surplus; the part is new and unused but may have been in storage for years. Packaging may show shelf wear or be missing.

Shipping & Handling

Domestic shipping via USPS Ground Advantage, USPS Priority Mail, or UPS Next Day Air. Cost is calculated at checkout based on your location. We ship within 1 business day.
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Shipping on your own UPS or FedEx account? No problem. This package ships at approximately 6.00 × 6.00 × 4.00 inches and 2.00 lb 8.00 oz. Send a message before checkout with your account number and shipping method.

Returns

We offer free returns through eBay's standard 30-day return policy. If something isn't right, message us first — we want to make it right and we'll work with you to do it.

About ACME MRO Solutions

We started ACME MRO Solutions to fix something we kept running into as contractors — plants down, parts slow, surplus listings you couldn't trust. Our goal is simple: get YOU the right component fast, with an honest description, so you can get back to running.

We describe what we see. Used items show signs of use; if a part has visible wear, damage, or a missing component, the condition description will say so. We don't claim anything is tested unless we tested it — and we don't bench-test parts where testing isn't practical or revealing (feed-through modules, breakers, mechanical components). When we do test something, we'll say so explicitly.

If something is our fault, we don't work through it — we make it right. We are proud to serve American manufacturing. Your uptime is our bottom line.

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Questions? Talk to us.

Send a message through eBay. During business hours we typically respond within the hour. Whether you need to confirm compatibility before buying, request additional photos, ask about a cross reference, or work through something after delivery — message first and we'll figure it out together.