Z2S Type Sandwich-Type Hydraulically Controlled Check Valve

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Product details

Z2S Type Sandwich-Type Hydraulically Controlled Check Valve

1. Core Definition & Technical Characteristics

• Model Affiliation: The Z2S series, developed by Bosch Rexroth, belongs to sandwich-type hydraulically controlled check valves adhering to DIN 24340 and ISO 4401 standards, enabling vertical stacking installation.

• Functional Logic:

• One-Way Blocking: By default, allows fluid flow only from A1→A2 or B1→B2, automatically sealing reverse flow to prevent backflow or flooding.

• Hydraulic Reverse Control: Input pressure via control ports (e.g., X/Y) can override the valve core for reverse flow, commonly used in hydraulic cylinder locking and pressure maintenance scenarios.

• Two-Stage Pressure Relief: Incorporates spiral bevel gear grinding processes and enlarged control orifice area ratios, enabling safe unloading even at low pilot pressures (3–10 bar) while reducing directional shift shock.

• Key Parameters:

• Operating Pressure: Max 315 bar (4568 psi), suitable for high-load applications.

• Flow Range: Max 450 l/min (118.9 US gpm), meeting high-flow demands.

• Opening Pressure: Configurable in 3/5/7.5/10 bar tiers to match system pressure requirements.

• Sealing Performance: Supports zero-leakage sealing for single/double working ports, ensuring prolonged pressure maintenance (e.g., hydraulic lock functionality).

2. Structural Design & Installation Features

• Modular Architecture:

• Sandwich design permits vertical stacking with directional valves, pressure valves, etc., forming compact hydraulic circuits.

• Port positions comply with ISO 4401-08-08-0-05 and NFPA T3.5.1 R2 standards, adaptable to various mounting surfaces (e.g., DIN 24340 Type A with/without locating holes).

• Installation Flexibility:

• Supports horizontal, vertical, swing base, and torque arm mounting configurations.

• Correct connection of control ports (X/Y), drain ports (L), and main ports (A/B/P/T) is critical to avoid functional failure.

• Material & Durability:

• Body constructed from cast iron/steel with optional anti-corrosion treatments (e.g., NBR/FKM seals, thick passivation layers) for harsh environments.

• Hardened gear grinding processes and solid-shaft designs enhance wear resistance and extend service life.

3. Application Scenarios & Industry Compatibility

• Typical Applications:

• Construction Machinery: Hydraulic cylinder locking and slewing device pressure maintenance in excavators, loaders, and road rollers.

• Industrial Equipment: Flow regulation and anti-backflow control in automated production lines, hydraulic presses, and injection molding machines.

• Specialized Scenarios: Anti-flooding in mining machinery, high-pressure systems in metallurgical equipment, and corrosion-resistant needs in marine hydraulics.

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