Vickers CT-06-F-50 Pressure Relief Valve 3/4″ NPT 3000 PSI

Eaton Vickers CT-06-F-50 Hydraulic Pressure Relief Valve (3/4″ Port, 50-Design Series)

The Eaton Vickers CT-06-F-50 (Part Number / MPN: 590540) is a heavy-duty, pilot-operated hydraulic balance piston pressure relief valve engineered for precise pressure regulation, system overpressure protection, and remote unloading in demanding industrial and marine applications.

Manufactured with high-tensile meehanite cast-iron housing and hardened alloy steel internal spools and seats, the CT-06-F-50 limits maximum hydraulic system pressure by bypassing fluid from the pressure line back to the reservoir once the preset pressure threshold is reached. Operating in the “F” pressure adjustment spectrum (100 to 210 bar / 1,500 to 3,000 PSI) with nominal flow capacities up to 60 GPM (227 L/min), this valve delivers exceptional stability, minimal pressure override, low hysteresis, and rapid response under severe pressure surges and cyclic loading.

Model Details

• Series Architecture: C (Pressure Control Valve)
• Mounting Style: T (Threaded / Inline In-line Pipe Connection)
• Nominal Size: 06 (3/4″ NPTF / BSPP depending on tap specification; nominal 3/4-inch bore)
• Pressure Adjustment Range: F (1,500 to 3,000 PSI / 100 to 210 bar)
• Design Number: 50 (50-Series Engineering Modification)
• Manufacturer Part Number (MPN): CT-06-F-50 / 590540
• Full Order Code: CT-06-F-50-UB / CT06F50

Technical Details

Features

1. Two-Stage Balanced Piston Design: Maintains steady cracking pressure regardless of system flow rate, reducing pressure override by over 60% compared to direct-acting relief valves.
2. Vent/Remote Port Capability: Incorporates an auxiliary vent connection (Port V) allowing remote pilot control or connection to an unloading solenoid valve for low-pressure pump idling.
3. Wide 1,500 to 3,000 PSI Operating Window: High-pressure “F” spring configuration enables reliable pressure damping across high-tonnage marine and heavy industrial machinery.
4. Heavy-Duty Cast Iron Damping Chamber: Cast-iron casing with precision-machined internal orifices absorbs hydraulic shock and dampens cavitation-induced valve chatter.
5. Tamper-Resistant Calibration: Features a fine-pitch manual adjustment screw paired with a positive locknut and protective cap to preserve settings under severe engine room vibration.

Frequently Asked Questions

What is the primary difference between a Vickers CT-06 and a CG-06 relief valve?

The prefix letter designates the mounting interface. The CT-06 is a threaded in-line valve with internal pipe connection ports (typically 3/4″ NPTF), allowing it to be plumbed directly into hard hydraulic piping. The CG-06 is a subplate/manifold-mounted valve adhering to standard ISO 6264 / NFPA footprint interfaces.

What happens if I use the vent port (Port V) on the CT-06 valve?

The vent port taps directly into the pilot spring chamber above the balance piston. When Port V is connected to a small directional valve routed to tank, venting occurs: fluid pressure above the main piston drops to near zero, allowing the main valve to open fully at minimal residual resistance (approx. 35 to 50 PSI). This is widely used for soft pump starting and system unloading.

Can the CT-06-F-50 valve handle biodegradable synthetic hydraulic esters?

Standard factory valves are equipped with Nitrile (NBR/Buna-N) seals suitable for standard mineral oils and water glycols. If operating on synthetic polyol esters (HEES) or phosphate ester fluids (skydrol), the internal O-rings and backup rings must be converted to Fluorocarbon (FKM / Viton) elastomer kits to prevent seal degradation and internal bypassing.

How do I troubleshoot a system that will not build hydraulic pressure past 500 PSI?

Isolate the CT-06 and verify:

• The remote vent port (Port V) is completely plugged or the downstream venting solenoid is seated tight without internal leak-by.
• The main balance piston moves smoothly within its bore and the return spring is intact.
• The pilot conical poppet seat is free from metal debris and erosion pitting.