Badestnost P80 P120 Series Monoblock Directional Control Valve | 1P80 2P80 3P80 1P120

The P80 and P120 Series monoblock directional control valves manufactured by Chengyuan Hydraulic are high-performance fluid power control components engineered to match the historical performance and design parameters of Bulgarian Badestnost multi-way valve lines. This universal and highly versatile product range provides precision engineering replacements for robust, high-frequency configurations, including 1P80, 2P80, 3P80, 4P80, 5P80, 6P80, P80-1, and high-flow 1P120 options.

Acting as the core steering executive unit within a hydraulic circuit, a monoblock valve’s internal tolerance and flow path efficiency directly influence overall machine smoothing and fuel economy. Chengyuan guarantees 100% original-place interchangeability regarding port centerlines, mounting footprints, spool stroke limits, and default center-spool architectures (complying with standard Open, Closed, or Tandem center schemas). Prior to packing, every multisection assembly undergoes 100% load testing and micro-leakage analysis to maintain accurate metering metrics and exceptional pressure hold characteristics under rigorous real-world shocks.

Technical Specifications 

• Compatible Brand: Badestnost (Bulgaria)

• Core Model Codes: 1P80, 2P80, 3P80, 4P80, 5P80, 6P80, P80-1, 1P120

• Available Sections: Monoblock structure available from 1 to 6 spools

• Nominal Flow Rates:

  • P80 Series: 80 L/min (21 GPM)

  • P120 Series: 120 L/min (32 GPM)

• Maximum Pressures: Ports P & A-B: 250 bar (3625 PSI); Port T: 50 bar (725 PSI)

• Spool Control Mechanism: Mechanical Spring Return-to-Center or Detent mechanism

• Standard Actuation Method: KZ1 manual lever assembly with removable handles

• Connection Port Sizes: P, A, B threads are G 1/2″ for P80, G 1″ for P120; Return T & N ports are G 3/4″ or G 1″

• Integrated Relief Valve: Built-in adjustable main pressure relief valve, factory preset around 170-250 bar

Key Technical Advantages:

• Heavy-Duty Rigid Monoblock Construction: Cast from premium high-tensile compacted graphite iron into a unified monoblock structure. This eliminates the multi-plate sealing seams of typical sectional valves, completely overcoming the risk of external leakage or minor body twisting under high-pressure spikes.

• Ultra-Low Internal Leakage via Mirror-Finish Spools: The individual sliding spools are hardened, chemically treated, and super-finishing ground to micro-tolerances. This precise matching keeps internal leakage under 30 $cm^3/min$ at 120 bar, preventing loaded cylinders or crane arms from drifting or dropping during hold states.

• Precise Proportional Metering Profile: Features mathematically optimized metering grooves precision-machined onto the spool land borders. During manual handle shifts, fluid delivery responds via a linear, smooth curve, providing operators with fluid micro-positioning and eliminating sudden shock jumps.

• Modular Versatility with Power Beyond (Carry-Over): The output end features a convertible internal port layout. By integrating a dedicated Power Beyond plug into the designated Carry-Over circuit, operators can supply downstream high-pressure flow to a secondary independent control valve group without causing backpressure feedback.

Application Areas:

• Agricultural & Forestry Machinery: Front-end loaders, agricultural tractors, log grabbers, timber cranes, and wood splitters.

• Environmental & Industrial Vehicles: Refuse compactor trucks, automated street sweepers, dump truck hoists, and multi-axis hook loaders.

• Construction & Earth Moving Machinery: Compact mini-excavators, track drilling rigs, utility skid steers, and hydraulic winch systems.

Expert Maintenance Tips:

• Mandatory Power Beyond Plug Configuration: If a secondary valve group needs to be plumbed in-line, a dedicated Power Beyond (Carry-Over) adapter plug must be installed. Plumbing directly from a standard return tank port into a downstream inlet will over-pressurize the internal casting cavity of the primary valve, causing spool oil seals to rupture immediately.

• Never Force Stiff Control Levers: The operational sliding force along the spool axis should remain under 300 N. If a handle feels heavy, jerky, or stuck, fine particulate contamination is typically wedged inside the micro-clearance. Do not force or hammer the lever, as this will permanently score the spool barrel and ruin the entire casting block.

• Eliminate Chassis Frame Mounting Twist: When fastening the monoblock housing with the 3 x M10 bolts onto a chassis frame, verify the mounting pads are perfectly flat. Forcing the bolts down against an uneven frame will induce subtle body flex, leading to spool binding or slow lever return failure.