Z2S6-1-6X Rexroth Pilot Operated Check Valve 315bar

Product Overview:

The Z2S series (including sizes Z2S6, Z2S10, Z2S16, featuring core part numbers like Z2S6-1-6X / R900347495) are pilot-operated check valves designed in a standard sandwich plate construction. They are engineered specifically for leak-free isolation of one or two actuator ports, making them indispensable safety components for holding cylinders in position under heavy loads. Fully benchmarked against original Rexroth engineering specifications, our Z2S valves guarantee 100% interchangeable compatibility. Furthermore, every single unit undergoes 100% simulated operational testing before delivery, ensuring absolute locking reliability and dynamic response in high-pressure hydraulic circuits.

Technical Specifications:

• Model Series: Z2S6, Z2S10, Z2S16 (e.g., Z2S6-1-6X, Z2S6-40B, Z2S10-1-3X)

• Nominal Size: NG6 (CETOP 3), NG10 (CETOP 5), NG16 (CETOP 7)

• Max. Operating Pressure: 315 bar (4568 psi)

• Max. Flow Rate: Z2S6 (up to 60 L/min); Z2S10 (up to 120 L/min); Z2S16 (up to 300 L/min)

• Cracking Pressure: Approx. 1.5 bar (Code “1”), 3.0 bar (Code “2”), 7.0 bar (Code “3”)

• Pilot Area Ratio: Approx. 1:3.3 (depending on size), ensuring smooth opening under pressure

• Mounting Standard: ISO 4401, DIN 24340 Form A (Sandwich plate mounting)

• Operating Fluid: Mineral oil (HL, HLP) according to DIN 51524

• Seal Material: NBR (Buna-N, for -30°C to +80°C) or FKM (Viton)

• Weight: Z2S6 approx. 0.8 kg; Z2S10 approx. 2.8 kg; Z2S16 approx. 5.5 kg

Key Technical Advantages:

1. Absolute Zero-Leakage Sealing: Features a poppet-type hard-seal design (precision-lapped poppet and seat) that guarantees virtually zero internal leakage, perfectly maintaining cylinder positions without drifting.

2. 100% Seamless Interchangeability: Manufactured in strict accordance with ISO 4401 standards. It functions as a direct drop-in replacement for original Rexroth valves (e.g., R900347495) with no modifications required to your subplates or piping.

3. Two-Stage Smooth Decompression: Advanced models utilize a pre-opening (decompression) feature on the main poppet. This safely releases built-up pressure from large-volume cylinders prior to full opening, eliminating hydraulic shock and loud switching noises.

4. Military-Grade Precision Machining: Housings are cast from high-strength iron, while internal poppets are induction hardened and micro-honed. This drastically reduces wear during high-frequency cycling and extends overall service life.

Application Areas:

• Injection Molding Machines: Clamping circuits where maintaining high pressure without drifting is critical.

• Presses and Machine Tools: Vertical lifting cylinders to prevent accidental load drops caused by gravity.

• Mobile and Construction Machinery: Outriggers and boom lock circuits requiring uncompromised load holding.

• Metallurgical Equipment: Heavy-duty hydraulic power units operating under continuous high-pressure conditions.

Expert Maintenance Tips:

• Fluid Cleanliness: Pilot-operated check valves are highly sensitive to contamination. Maintain hydraulic fluid cleanliness at ISO 4406 class 20/18/15 or better to prevent the poppet from jamming or scoring the sealing surface.

• Air Bleeding: When initially installing or replacing a Z2S valve (such as the Z2S6-1-6X), ensure the pilot lines are thoroughly bled. Trapped air can cause severe chattering, vibration, and noise during the valve’s opening phase.

• Tie-Rod Torque: Always use Grade 10.9 high-tensile tie rods for sandwich valve installations. Tighten uniformly to the specified torque (e.g., 8 Nm for Z2S6; 15 Nm for Z2S10) to prevent housing distortion or external weeping.