Sleeves and Top Loader - inside-the-box

  • Post-compensation vs. Pre-compensation: When Post is Better

    The fundamental difference is that with pre-compensation, the pressure drop across the orifice or spools is determined by the compensator. With post-compensation, the pressure drop is determined by the load sense (LS) spring inside the pump. In post-compensated systems with multiple functions, the pump flow is divided at a fixed ratio.

    Learn More
  • Electronic Pressure Compensation EPC – Coperion

    Traditionally, these troublesome pressure fluctuations have been compensated for by mechanical means such as flexible bellows. Mechanical tolerances, the alignment and age of the bellows, etc. are factors which can impact the mechanical pressure compensation and prevent it from fully compensating for the forces generated by changing pressures

    Learn More
  • Pressure Compensated Hydraulic Pumps - Womack Machine

    Where Pressure Compensated Pumps Are Used Basically the pressure compensator is designed to unload the pump when system pressure reaches the maximum design pressure. When the pump is unloaded in this way, there is little HP consumed and little heat generated even though pressure remains at the maximum level, because there is no flow from the pump.

    Learn More
  • Figure 18-1 Chapter - G-W

    Pressure-Compensating (LSPC) Hydraulic Systems The previous chapter focused on pressure-compensating hydraulic systems, which use a variable-displacement hydraulic pump that main-tains high pressure and practically no fl ow any-time the DCVs are in a neutral position. LSPC systems use closed-center DCVs and one of two hydraulic pump designs

    Learn More
  • Please help! Pc35mr-2 | Heavy Equipment Forums

    Jan 24, 2016 · Pc35mr-2 please move wrong section. I have been working on this little 35 for a couple days now. It came in with weak functions. Boom, stick, and bucket are all weak. About 1500 psi less than what it calls for. Travel, blade, and swing are all good pressure and function wise. I have a …

    Learn More
  • Excavator-specific Hydraulic System Solutions

    compensation system is a trend for compact, efficient and complex mobile hydraulic systems and the actuators are optimally controlled regardless of inlet flow or number of actuators. Suitable for excavator ranging from 1.5T to 15T Solutions • Mono-block design, small size and light weight • In-block oil confluence for high efficiency

    Learn More
  • Differences between Load Sensing and Pressure compensated

    I am extremely fortunate to work with engineers such as Alex Chavez from ART, LTD. Here he is going over there differences between the load sensing and press

    Learn More
  • compensating | John Deere Excavator

    The item "JOHN DEERE AT152058 VALVE, PRESSURE COMPENSATING 690E LC EXCAVATOR HYDRAULIC OEM" is in sale since Thursday, July 07, 2016. This item is in the category "Business & IndustrialHeavy Equipment Parts & AccsConstruction Equip Parts". The seller is "buckandknobby" and is located in Ottawa Lake, Michigan. This item can be

    Learn More
  • J1A125ZN - Pressure Compensated Priority Flow Control

    Pressure compensated priority flow control valves maintain constant flow regardless of changes to inlet pressure for flows up to 90 lpm (24 gpm) and pressures up to 420 bar (6000 psi); excess flow is diverted once the priority flow requirement is met.

    Learn More
  • Please help! Pc35mr-2 | Heavy Equipment Forums

    Jan 24, 2016 · Pc35mr-2 please move wrong section. I have been working on this little 35 for a couple days now. It came in with weak functions. Boom, stick, and bucket are all weak. About 1500 psi less than what it calls for. Travel, blade, and swing are all good pressure and function wise. I have a …

    Learn More
  • How does a pressure-compensated flow control valve …

    Hydraulic Pump Basics Hydraulic Pump Purpose

    Learn More
  • Pump-Pressure-Compensation-Based Adaptive Neural …

    Jul 12, 2018 · In this paper, a novel pump-pressure-compensation-based adaptive neural torque controller is proposed for a hydraulic excavator. To guarantee that the control gains are not zero and the system is controllable, a novel hydraulic structure is proposed and the pump pressure is compensated for.

    Learn More
  • What to Do If a Shaft Seal Fails on a Pressure Compensated

    Nov 04, 2019 · Most hydraulic industrial equipment is designed to work at about 2,000-3,000 PSI (pounds of pressure per square inch). There are two main ways a system can fail: having too little pressure or having too much. When most pumps fail, pressure drops as fluid leaks out. But when pressure compensated pumps fail, they fail high. They build up too much

    Learn More
  • ROVs: The Workhorse of Subsea Hydraulic Systems - Fluid

    May 15, 2021 · Pressure compensation Although oil is generally considered incompressible, oil and the gas molecules entrained within the oil do compress slightly under high pressure. Compressibility varies by fluid type and other factors, but a common rule of thumb is …

    Learn More
  • J1A125ZN - Pressure Compensated Priority Flow Control

    Pressure compensated priority flow control valves maintain constant flow regardless of changes to inlet pressure for flows up to 90 lpm (24 gpm) and pressures up to 420 bar (6000 psi); excess flow is diverted once the priority flow requirement is met.

    Learn More
  • I have a Deere 490E hydraulic excavator with a hydraulic

    I have a John Deere 490E hydraulic excavator with a hydraulic problem. The syptoms are that when pressure builds on all of the functions, it tries to kill the motor. The pump was recently replaced and the engine runs strong with good compression. the only function that isn't affected is the swing system.

    Learn More
  • Check Valves, Flow Control and Priority Flow Control Valves

    A minimum of 200 psi (14 bar) pressure differential should be maintained for optimum pressure compensation. Factory settings are within +/10% of the customer requested flow setting. Tunable control option that provides a +/- 25% adjustment variation of the nominal factory set flow. Two Port Fully Adjustable Pressure Compensated Flow

    Learn More
  • Check Valves, Flow Control and Priority Flow Control Valves

    A minimum of 200 psi (14 bar) pressure differential should be maintained for optimum pressure compensation. Factory settings are within +/10% of the customer requested flow setting. Tunable control option that provides a +/- 25% adjustment variation of the nominal factory set flow. Two Port Fully Adjustable Pressure Compensated Flow

    Learn More
  • How does a pressure-compensated flow control valve work

    Oct 09, 2019 · The load pressure is the pressure in the line leading from the pressure-compensated flow control valve to the load, such as a hydraulic motor or cylinder. Fluid that has passed the inlet and compensator orifice but has not yet reached the variable …

    Learn More
  • A guide to selecting the right hydraulic flow control valve

    (SYSTEM PRESSURE x PISTON AREA RATIO) + LOAD PRESSURE Where : AREA RATIO = FULL BORE AREA ÷ ANNULUS AREA LOAD PRESSURE = WEIGHT or LOAD FORCE ÷ ANNULUS AREA For example, with a 2:1 ratio cylinder operating at 200 bar (3000 psi) system pressure and a load pressure of 175 bar (2500 psi) the pressure generated at the cylinder

    Learn More