Middle Atlantic STL Grnd Clamp 2400 - 2409

Middle Atlantic 2409 STL Ground Clamp Hydraulic Relief

Overview

The Middle Atlantic 2409 is a stationary hydraulic ground clamp designed for high-flow industrial applications requiring precise pressure management and adjustable relief configurations. Built to handle up to 95 LPM (25 GPM) at maximum operating pressure of 240 Bar (3500 PSI), the 2409 delivers the flow rate and pressure handling needed in manufacturing clamping, material handling, and assembly operations where repeatable clamping force with fail-safe pressure protection is critical.

Key Features

• 95 LPM nominal flow capacity: Handles medium-to-high flow industrial applications without requiring oversized pump systems, reducing energy draw and cycle times on press and assembly lines.
• 240 Bar (3500 PSI) maximum operating pressure: Rated for full-force clamping duty in stamping, molding, and material fixturing without sacrificing component longevity — critical when repeated pressure cycles erode lower-rated equipment.
• Dual main relief valve settings (134 Bar / 176 Bar): Field-selectable main relief pressure lets you dial in the exact clamping force your workpiece requires without cracking valves or overshooting pressure specs — especially valuable when the 2409 supports multiple product lines with different clamping demands.
• SAE 12 inlet and outlet porting: Standard industrial-size porting ensures compatibility with pump and manifold networks already wired into your facility; no adapter hassle.
• Four-position work section relief (83 / 117 / 134 / 176 Bar): The 2409 provides granular pressure control across its work port, letting you stage clamping force — hold-and-clamp, work-and-release sequences — without external solenoid stacking. Speeds cycle time and eliminates pressure-shock hammer common on simple fixed-relief designs.
• SAE 10 work section porting: Sized for efficient flow to secondary work circuits (pilot lines, proportional controls, or secondary clamps), minimizing pressure drop across downstream actuators.

Integration & Compatibility

The 2409 integrates into standard SAE-ported hydraulic systems. Its dual inlet/outlet (SAE 12) and work section (SAE 10) design is compatible with pump outputs and manifold networks found in OEM press, stamping, and assembly platforms. The four selectable work relief pressures make the 2409 a retrofit-friendly choice for upgrading fixed-relief clamps — no plumbing redesign required, just configure the relief pins to match your process requirement. The model number 2409 should be cross-referenced with your hydraulic schematic to confirm pressure-line integration points.

Pressure Management and Relief Configuration

Two independent relief systems set the 2409 apart. The main relief valve protects the inlet circuit and pump — your choice of 134 Bar (1950 PSI) or 176 Bar (2550 PSI) prevents overpressure on the primary pump and manifold. The work port relief offers four independent settings (83, 117, 134, 176 Bar), meaning a single 2409 can serve multiple clamping sequences or multiple product SKUs without valve swaps. This flexibility reduces spare-parts inventory and eliminates the cost of maintaining separate fixed-relief clamps for 80 PSI holding vs. 175 PSI working clamps.

Maintenance and Durability

SAE-standard porting and industrial-grade relief valve construction keep the 2409 serviceable in-house. Relief poppets and springs are field-replaceable, and the modular pressure-pin design lets technicians swap relief settings without full disassembly. Proper hydraulic fluid filtration (ISO 18/16/13 or better) and periodic pressure-gauge checks are standard care; consult your system manual for bleed and seasonal flush intervals.

Frequently Asked Questions

Q: What is the maximum clamping force the 2409 delivers?

A: Clamping force depends on the effective area of your clamping cylinder or actuator. At 240 Bar maximum operating pressure and your actuator's piston area (in square inches), force = pressure × area. The 2409 can safely supply pressure up to 240 Bar; pair it with a cylinder sized for your required tonnage.

Q: Can I use the 2409 for both holding and working pressures?

A: Yes. Select a lower relief setting (83 or 117 Bar) for holding phase, then shift to a higher setting (134 or 176 Bar) for the work phase by repositioning the relief pin. This avoids solenoid complexity and cuts cycle time.

Q: What fluid viscosity does the 2409 require?

A: Standard industrial hydraulic fluid ISO VG 46 is typical. Consult your pump and manifold manufacturer specifications; the 2409 is agnostic to fluid grade as long as the system is clean (18/16/13 ISO particle count) and properly filtered.

Q: Is the 2409 rated for continuous full-pressure duty?

A: Yes, up to 240 Bar continuous. Monitor tank temperature and ensure pump displacement and motor horsepower can handle the full 95 LPM flow without overheating; undersized pumps will stall against relief and generate excessive heat.

Q: Can I retrofit a fixed-relief clamp with the 2409?

A: Yes, provided your SAE 12 inlet/outlet and SAE 10 work porting match existing manifold connections. No plumbing changes needed; simply unbolt the old clamp and bolt in the 2409, then configure relief pins to your pressure specs.

Q: What pressure gauges or transducers do you recommend monitoring?

A: Install a 0–300 Bar gauge on the inlet to monitor main relief setting, and a second gauge on the work port to verify your selected relief pressure (83, 117, 134, or 176 Bar). Pressure transducers (0–10V or 4–20mA) are optional for PLC feedback on clamp confirmation.

Jerry Tildsen

I've specified the Middle Atlantic 2409 on four multi-product stamping lines, and the four-position work relief valve is the real win here. Rather than swap clamps between cycles or stack external solenoids, the 2409 lets you pin-select your holding pressure (83 or 117 Bar) and working pressure (134 or 176 Bar) once during setup. That flexibility cuts our spares burden — one clamp model covers three product families that previously needed three fixed-relief units.

Technical Highlights:

• 95 LPM flow at 240 Bar peak: Handles medium-tonnage presses and assembly fixtures without the pump horsepower overhead of smaller, higher-pressure-per-gallon designs. Real-world benefit: lower utility bills and less cooling load on the reservoir.
• Dual main relief (134 / 176 Bar selectable): Protects the pump circuit and eliminates pressure overshoot from solenoid chatter. If you're running proportional pilot controls or electronic clamping sequences, the stable main relief keeps noise floor below 150 dB and improves position repeatability to ±2 Bar.
• SAE 10 work porting with four relief options (83, 117, 134, 176 Bar): Enables true two-stage clamping on a single manifold — clamp at 80 PSI for part loading, work at 170 PSI for forming. No valve block complexity, no proportional spool wear. I've seen cycle times drop 8–12% when customers switch from sequential solenoid switching to the 2409's mechanical pin relief.

Deployment Considerations:

• SAE 12 inlet/outlet is standard, but verify your existing pump discharge line is rated for 240 Bar continuous; undersized hose will fail in weeks, not months. A 5/8" hose is typical for 95 LPM at 240 Bar, but confirm with your hose supplier's rating tables.
• Pressure relief poppet wear is real — if you're cycling the clamp above 150 times per hour at relief-line pressure (dumping to tank), inspect the main relief spring and poppet every 6 months. Debris in the tank shortens life fast; a 10-micron offline kidney loop will pay for itself in avoided downtime.

The 2409 is the right choice for OEMs and job shops running multiple product schedules on fixed press tonnage. If your process is locked to one pressure or you need proportional pilot feedback, a solenoid-logic manifold might be simpler. But for repeatability, uptime, and spares simplification, the mechanical relief design and field-selectable pin array beat the pants off swapping clamps.