Zawory dozujące

Priority style pressure compensator flow control valves maintain constant priority flow to one leg of a circuit regardless of any changes in load or inlet pressure. Once the priority flow is satisfied, any excess flow may be used in other parts of the circuit.

The valve consists of a control orifice housed within a spring biased compensator spool. This orifice may be fixed or adjustable. The priority port is normally open while the bypass port is normally closed. As flow enters the inlet port of the cartridge, it passes through the control orifice. A pressure differential is created across the compensator spool. If the inlet flow exceeds the setting of the valve, the force produced by this pressure differential exceeds the spring force and shifts the compensator spool; opening up the bypass port, and bypassing the excess flow. If the load pressure at the bypass port is greater than the load pressure at the priority port, the compensator spool will further shift restricting the priority flow to that of the valve setting. However, caution should be taken if the priority gets blocked so that no flow can pass through the control orifice, the compensator spool will shift, blocking the bypass port and allowing inlet pressure to go to full system relief pressure. It is common to place an external relief valve downstream of the priority flow port to prevent a no flow condition.

Parker offers four styles of Pressure Compensated Priority Flow Controls ranging from 4 to 24 gallons per minute. Parker’s offering is as follows:

J02D3 - 4 gpm rated flow, 6000 psi, and is available with adjustment styles of Screw adjust, Knob adjust, and a Tamper resistant cap. Customers can request specific flow settings. Buna and Fluorocarbon seals available.

FP101 - 8 gpm rated flow with 15 gpm max inlet, 3500 psi, with adjustment styles of Fixed, Knob, and Screw. Nitrile and Fluorocarbon seals available.

J04D3 - 12 gpm rated flow, 6000 psi, and is available with adjustment styles of Screw, Knob, and Tamper Resistant cap. Customers can request specific flow settings. Nitrile and Fluorocarbon seals available.

J1A125 - 24 gpm rated flow, 5000 psi, and is available with adjustments styles of Screw, Knob, and Tamper Resistant. Customers can request specific flow settings. Nitrile and Fluorocarbon seals available.

Pressure compensated priority flow control valves are typically used in meter-in type circuits like steering (mobile equipment) or actuator speed control (industrial equipment) where a fixed displacement pump is being used.

Inlet flow (upstream of the orifice or flow control valve) is split with one portion going to the compensator port inlet, the other portion passes through the orifice, or flow control valve, to the supply port. As pressure drop across the orifice reaches the selected compensator pressure drop, the higher pressure (pre-orifice) starts to shift the compensator spool into a throttling position. The valve works to maintain a constant pressure drop across the orifice. Using this type of valve allows greater flexibility in design and flows as these valves can flow as much as 40 gallons per minute.

Compensator valves are used in circuits where a constant flow is desired regardless of upstream or downstream loads. As the pressure downstream of the compensator increases, the valve is forced open to maintain the constant pressure drop across the fixed, or adjustable, orifice. Conversely, if the pressure increases upstream of the orifice, the compensator valve will be forced closed to maintain the constant pressure drop across the orifice.

Parker offers two sizes of restrictive type of pressure compensators ranging in flows from 10 gallons per minute to 40 gallons per minute, and pressures up to 3500 psi.

FCR101 - 10 gpm rated flow (38 lpm), 3500 psi. Differential pressure ranges of 40, 80, and 160 psi and is available with Nitrile or Fluorocarbon seals.

FCR161F - 40 gpm rated flow (150 lpm), 3500 psi. Differential pressure ranges of 40 and 160 psi and is available with Nitrile or Fluorocarbon seals.

Pressure compensators can typically be found in applications such as conveyor circuits in saw mills, or lumber yards, steel mills, or cylinder control circuits in steel mills or foundries.

Parker offers a wide range of spool type restrictive pressure compensated flow controls to allow for speed control of motors, cylinders, and rotary actuators. Pressure compensation allows the flow devices to maintain a constant flow even with varying loads and inlet pressures. Tunable and fully adjustable versions are available with screw or knob adjusters that can be made tamper resistant with the addition of an optional cap.

FR101 is a tunable pressure compensated flow regulator which compensates for varying loads and pressures in one direction but in the other direction flow is metered across a fixed orifice but not compensated. In order to allow pressure compensated flow control in one direction and full free flow in the opposite direction, Parker offers an internal check valve in the tunable FC101 cartridge. Because both versions are tunable and not fully adjustable, the valve will need to be specified with the appropriate flow range for the application. Changes in flow rates are achieved by mechanically varying the spring force acting on a spool that has a fixed orifice and metering compensator.

J02E2, J04C2, and J04E2 are fully adjustable pressure compensated flow regulators. In the opposite flow direction they only meter through a fixed orifice and do not compensate. In order to achieve fully adjustable pressure compensated flow control while allowing reverse full flow, the FA101 includes an internal check valve to bypass the compensator and metering orifice.

Typical applications and industries include Accumulator Bleed-off, Motor Speed Control, Cylinder Speed Control, Bleed-Off Flow, Power Units, Oil and Gas, Material Handling, Construction, Drills, Presses, Mixers, Agriculture, Balers, Combines, etc.

Needle valves offer economical solutions for applications that require basic adjustable control of hydraulic flow. The effective orifice size inside the valve is varied with screw or knob adjustments and the valve can be made tamper resistant with the addition of an optional cap. Shutoff can be achieved when the valve is adjusted completely closed. Once the adjustment is set, the valve acts as a fixed orifice. Like all fixed orifices, any changes in pressure will cause changes in flow. If constant flow is required regardless of system or load pressure, please consider Parker’s pressure compensated flow controls.

Parker’s J02A2, NVH081, NVH101, and J06A2 cartridges are basic 2-port needle valves with fine adjustment options available. The orifice will meter in both directions, but flow from port 2 to 1 is preferred. If unrestricted reverse flow is required, an additional check valve will need to be used with these needle valve versions.

Parker also offers J02B2, FV101, and FV102 needle valves with internal reverse free flow checks in order to reduce manifold size and component quantities. Typical applications and industries include Accumulator Bleed-off, Motor Speed Control, Cylinder Speed Control, Bleed-Off Flow, Power Units, Oil and Gas, Material Handling, Construction, Drills, Presses, Mixers, Agriculture, Balers, Combines, etc.

Parker offers two styles of Priority Pressure Compensators, ranging in flows from 10 to 20 gallons per minute, and pressure capabilities of 3500 psi and 5500 psi. Flow through the external orifice (fixed or variable) enters the supply port and produces a pressure drop across the compensator spool. When the inlet pressure exceeds the initial setting of the valve, the force produced by the pressure differential across the spool exceeds the spring force and shifts the compensator spool to throttle, or restrict, the flow, thus maintaining constant flow through the priority port. The excess flow is bypassed out to the system to be used by another function, or back to the system reservoir. Flow out the regulated port must be maintained for bypass flow to continue. For this reason, common practice dictates a pressure control (relief) be installed in the priority line.

Parker offers the following styles of Priority Pressure Compensators:

FCP101 - Up to 10 gallons per minute priority flow rate (38 lpm), 15 gallon per minute maximum inlet flow (56 lpm), 3500 psi. Available with differential pressure settings of 40, 80, and 160 psi. Nitrile and Fluorocarbon seals available.

FCPH121 - Up to 20 gallons per minute priority flow rate (75 lpm), 25 gallons per minute maximum inlet flow (95 lpm), 5500 psi. Available with fixed (customer specified) or variable differential pressure settings. Adjustments are knob or screw adjust, with a tamper resistant cap available.

Priority Pressure Compensators are used where the design calls for constant flow to a particular segment of the circuit, regardless of upstream or downstream pressure (load) changes. A common application is for speed control on a conveying system. Should the load on the conveyor increase, the pressure increases at the compensator and the valve modulates to maintain the desired pressure differential across the valve. This modulation allows more flow to pass through the valve thus maintaining a constant desired speed. Conversely, should the load on the conveyor decrease, the opposite happens and the compensator modulates, restricting some flow to maintain the desired pressure differential, thus providing constant speed.

Parker Priority Pressure Compensators may be found in steering circuits, conveying systems, lift/lower systems in markets such as mobile/agricultural companies, steel or lumber mills, or off-highway mobile equipment.

Parker’s proportional flow control valves provide electronically variable flow control. Varying coil current will create a proportional flow out to an actuator allowing control of speed, acceleration, and deceleration. AC and DC coil options are available, along with a wide range of connection types. Current Controlled Pulse Width Modulation (PWM) valve drivers are preferred as they adjust for variations in coil temperature and also provide the ability to apply a dither frequency.

Priority Bypass is the last type of proportional flow control manufactured by Parker. Two sizes are available and the largest version is capable of flows up to 20 GPM (75 LPM.) Priority bypass flow controls are 3-way spool-type valves that consist of an inlet port, a priority port, and a bypass port. When no current is applied to the coil, all inlet flow exits the bypass port. As current is increased the spool shifts allowing a proportional amount of pressure compensated flow to the priority port while bypassing any remaining flow to the bypass port. Bypass flow is not allowed unless the priority ports has achieved the commanded proportional flow rate based on the input current. This allows for a priority of flow to one part of a circuit regardless of varying load conditions in both parts of the circuit. Typical priority applications include braking and steering.

Combined with Parker’s wide range of Coil options, the extensive proportional flow control offering allows for application specific solutions in the most demanding applications and markets including: Power Units, Oil and Gas, Material Handling, Construction, Drills, Presses, Mixers, Agriculture, Balers, Combines, Double Acting Cylinder Control, Bi-Direction Motor Control, Circuit Selectors, Skid-Steers, etc.

Parker Hydraulic Cartridge Systems Division combines Parker’s precision ground poppet and SuperCoil technology with a newly patented integral compensator design, bringing you a flow control product with best in class repeatability and a truly exceptional level of control.

In conditions of varying load, the FAPC series maintains predictable and repeatable performance through the introduction of our new fully integrated compensator. Built directly into the FAPC series valves, the innovative new compensator maintains a tight seal for load holding without any requirement for additional sealing. When open, the compensator responds to changing load conditions independently. With no seal friction to overcome, the FAPC valve maintains the repeatable and predictable performance customers can rely on. This additional feature eliminates the need for complex programming algorithms, and any requirement for an external compensator to improve the operator’s control.

• Excellent metering capability and control throughout the full flow range
• Reduced drift
• Low leak control (less than 5 dpm)
• Modular solution to applied problem
• Low leak compensator, requiring no additional seals, results in very low hysteresis (< 10%)
• Maintains constant flow regardless of load condition
• Patented integrated low leak compensator

How it works:
The FAPC utilizes a control current to proportionally raise and lower a poppet creating a variable orifice allowing flow to pass through from the inlet to the outlet. There is also a low leak integral compensator that responds to load changes in the hydraulic circuit by varying the outlet orifice, metering the flow rate that can be passed through and maintaining constant flow independent of load conditions.

The fully compensated FAPC is rated to flows up to 115 LPM (22 GPM).

Common markets and applications include the aerial markets (boom raise/lower), fork lift (lift/lower) and vehicle lift.

Parker’s selection of 2-way flow control proportional valves provide repeatable and precise controls to circuits requiring proportional flow control through a single line in a normally-open or normally-closed configuration. These valves are capable of handling flows up to 227 lpm (60 gpm) and pressures as high as 210 bar (3000 psi). These valves can achieve pseudo pressure compensation in both normally-open and normally-closed versions due to the pressure drop across the spool orifices, but an external compensator can also be used if finer control is required, making these valves ideal for variable applications that need exact control and do not demand the exact same flow every time a function is operated. Parker’s 2-way flow control proportional valves pair well with any Current Controlled Pulse Width Modulation (PWM) valve driver and can be used on a variety of mobile and industrial applications within the agriculture, construction, and manufacturing markets.

Markets:
• Agriculture
• Construction
• Material Handling
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Miscellaneous Mobile

Features/Benefits:
• Low hysteresis
• Hardened working parts for maximum durability
• All external parts zinc plated

Applications:
• Applications requiring precise controls
• Variable flow applications

Additional Technical Insight:
Recommended to be used with a Current Controlled Pulse Width Modulation (PWM) valve driver.

Manatrol 2 way flow control valves series PM*CS for pressure compensated regulation of the flow. As a consequence of pressure changes, the set value can vary by ± 5 % within the tolerance range. Changes in viscosity and in temperature have the same effect and are to be observed.
The series PC*MS is additionally equipped with a built-in check valve for the return flow.

Manatrol throttle check valves series FS allow the adjustment of the flow for a defined direction.
A 2 stage needle allows for very exact setting of smaller flow rates with the first 3 rotations of the adjustment knob. After 3 more rotations, the valve is completely open. The valve setting can be locked by a locking screw.

As part of the Colorflow Family, Parker PC Series Pressure Compensated Flow Control Valves have color rings that provide an accurate visual indication of valve adjustment. The PC Series Pressure Compensated Flow Control valve comes with an adjustable needle or with a factory set fixed flow rate.  The adjustable setting can be secured with a standard set screw or a thumbscrew option that does not require additional tools. The PC Series valve is available in 6 sizes from 1/4” to 1 1/4”.

The PC Series Valve are available with NPT or SAE ports. Material offerings are steel and stainless steel. The steel version comes standard with black oxide finish. These pressure compensated valves can be found in numerous pneumatic, hydraulic or water applications including:

• Food process
• Construction equipment
• Factory automation
• Power units
• Plastic molding
• Material handling
• Oil & gas
• Die cast
• Machine tools
• Car washes
• Paper mills
• Marine

Series MVI cartridge-type needle valves are designed for installation in a precision-machined cavity made in the manifold of the machine.

These valves provide precise metering control and full shutoff of flow. An o-ring and backup ring installed on the cartridge fully isolate the inlet and outlet ports of the machined cavity from each other.

The exclusive “Colorflow” color-band reference scale on the valve stem is a great convenience and time-saver in setting the valve originally and in returning it to any previous setting.

As part of the Colorflow Family, Parker PCM Series Pressure Compensated Flow Control Valves have color rings that provide an accurate visual indication of valve adjustment. The PCM Series Pressure Compensated Flow Control valve comes with an adjustable needle or with a factory set fixed flow rate.  The adjustable setting can be secured with a standard set screw or a thumbscrew option that does not require additional tools. The PCMSeries valve is available in 6 sizes from 1/4” to 1 1/4”.

The PCM Series Valve are available with NPT or SAE ports. Material offerings are steel and stainless steel. The steel version comes standard with black oxide finish.
These pressure compensated valves can be found in numerous pneumatic, hydraulic or water applications including:
• Food processing
• Construction equipment
• Factory automation
• Power units
• Plastic molding
• Material handling
• Oil & gas
• Die cast
• Machine tools
• Car washes
• Paper mills
• Marine

As part of the Colorflow Family, Parker MV Series Needle Valves have color rings that provide an accurate visual indication of valve adjustment. The MV Series needle valve comes in 3 adjustment options, standard, fine and micro-fine. The valve is available in an in-line or right angle style.

The MV Series Needle valve is available in 7 sizes from 1/8” to 1”. Port options include NPT and SAE. Right angle valve option is available with male or female NPT ports. Material offerings are brass and steel. The steel version comes standard with black oxide finish. It can be ordered with optional panel mount kits.
The MV Needle Valves can be found in numerous pneumatic, hydraulic or water applications including:

• Food processing
• Construction equipment
• Factory automation
• Power units
• Plastic molding
• Material handling
• Oil & Gas
• Die cast
• Machine tools
• Car washes
• Paper mills
• Marine

Zawór serii N firmy Parker to dwustopniowy zawór iglicowy, która umożliwia dokładne nastawienie przy niskim przepływie w zakresie pierwszych trzech obrotów pokrętłem regulacyjnym. Po następnych trzech obrotach zawór zostanie otwarty z pełnym przepływem, a w obrębie tych obrotów możliwe jest standardowe ustawienie dławienia.

Rynki:
• Automatyka przemysłowa
• Obrabiarki
• Przemysł morski
• Transport materiałów
• Górnictwo
• Przemysł
• Produkcja
• Formowanie
• Przemysł naftowy i gazowy
• Wytwarzanie energii elektrycznej
• Fabryki pojazdów

Cechy/zalety:
• Dostępna opcja odporna na ingerencję
• Śruba ustalająca blokuje zawór w żądanym ustawieniu
• Dostępnych jest osiem rozmiarów przyłączy od 1/8 do 1 1/4 cala.
• Oferowane materiały to mosiądz, stal i stal nierdzewna
• Opcje przyłączy obejmują ISO 6149, NPT, BSPP, BSPT i SAE
• Wyjątkowy kolorowy pasek „Colorflow" zapewnia dokładne wizualne wskazanie nastawy.

Zastosowania:
• Nadaje się do ogólnych zastosowań hydraulicznych

Parker’s NS series needle valve allows fine tuning at low flow with the first three turns of the adjusting knob, with full-open flow plus conventional precision throttling with the final three turns of the knob.

Markets
• Factory Automation
• Machine Tools
• Marine
• Material Handling
• Mining
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Molding
• Oil &Gas
• Power Generation
• Vehicle Assembly Facilities

Features/Benefits
• Tamperproof option available
• Set screw locks the valve on a desired setting
• Port sizes available in 5 sizes from 1/4” to 1”
• The exclusive “Colorflow” color-band provide an accurate visual indication of setting

Applications
• Suitable for general hydraulic applications