See Section 2.7, Data Pages 2.7-62E  Model RNX-PM33-x. This model is also still available in the smaller 22mm size, though it is not in the latest catalog. Design features are the same, parts are scaled down.

The design offers some desirable features that assure superior operating performance in the critical load holding area as well as providing long wearing reliable product so important in heavy duty mobile equipment machines.

1.  Note the poppet type spool is push type to seal and held in position by both the pilot spring and the actuator pressure; thus insuring that the tapered poppet/spool is fully seated and driving the poppet onto the seat.  This adds additional strength to the holding force, and aids in forming a tighter seat to assure virtual zero leak when holding a loaded cylinder.

2.  Note also that the pilot spool is fully guided (bearing) and the poppet seat cannot cock or the seat, or wobble when traveling.

3.  Note that there is a O ring groove cut in the pilot piston. This allows for an O ring seal on the pilot piston when the pilot piston can receive the signal for pilot shift function if pilot pressure is used from another separate function. For ordering this option, signify b adding the number C7 to the end of the model number.

4.  All steel metal parts, such as the one piece cartridge body, are of zinc plated steel, (stainless on special option) and are rated to 5500 psi continuous duty. Standard seals are of Buna N (Nitrile) Rubber, or Viton, ethylene propylene (EPR) seals on request.

5.  The model RNXPM33-x is rated to 350 bar working pressure, 160 liters/minute. The model RNXPM33-x is rated to 350 bar and 80 liters/Minute. 

Ed V. Askey

See general catalog Section 1.12 data pages 1.12-21E thru 1.12-505E

We continue to predict substantial growth with this product line as it complements the integrated circuit designs that use a variety of screw-in-cartridges and flange mounted valves on manifolds, and provides high flow rate capacity to the manifold system for shut-off, blocking, unloading functions, and also high flow rate capacity for pressure control functions. The individual 2 way position cartridges and control covers are rated to 5000 psi continuous duty, and flow rates in 4 sizes to 320 GPM.

Control functions include 2 way 2 position shut off and dump valves, normally closed or normally open, solenoid operated (includes explosion proof models), air or oil pilot operated; pressure relief valves, pressure reducing valves, pressure unloading valves, throttle valves, check valves, and pilot operated check valves. In addition, solenoid operated pressure and throttle valves are offered with proportional solenoid controls when remove full range variable pressure and flow control is required. Note that the various control valves used to pilot the larger 2 position cartridges are the catalog standard solenoid operated 2 and 3 way 22 mm valves and cartridges, or various pressure control valves, and thus offer all the styles, options, modifications, etc. that have been developed for separated functions and sizes of 2 and 3 way sub plate mounted or screw-in cartridges. This allows a wide selection of styles and features for pilot valve selection, and installation, repair and ser vice.

The standard Wandfluh options include seal selection of Buna N, Viton, or EPR, and a wide range of solenoid and proportional voltages, choice of adjustment styles, pressure ranges, and external metal material and finishes (including type 316L stainless).

Wandfluh can also provide the individual housing (bodies) to hold the drop-in style cartridges and bolt on control assemblies, or design and quote the complete manifold with valves and cartridges installed and tested.  See attached an integrated circuit done to provide accurate and repeatable pressure and flow control for a marine thruster Control Valve that can be rated to 5000 psi and 160 GPM 

Ed V. Askey

1. Roller Cam operated 2 and 3 way poppet style rather than the standard hand operated spool types shown in the catalog data pages 1.5 E. The model number changes to AT from AH, and the standard 2 and 3 way poppet valve numbering is used (see page 1.11-2005E) Example: a Roller Cam Operated 2 way normally closed NG6 model becomes AT22061A 

2. Standard hand Lever Operated, spring return poppet valves can also be provided with a 2 position detent function in NG6 and NG10 sizes.  For NG6 size, add S-2017 at the end of the model number. Example AH22061A-S2017. for NG10 size add S-2131 at the end of model number. Example: AH101a-S2131

3. Solenoid Operated 2 and 3 way poppet valves can be provided with a soft shift armature that will slow the poppet shift function and aid in reducing shock when shifting under load.  Add the number M30 just after the voltage stated. . Example AS22061a-G24-M30  This function will not reduce the shifting shock as well as a spool type soft shift valve does, but it will dampen especially decompression shock.

4. Solenoid Operated 4- way, 3 position Poppet Style, virtual zero leak Directional Valve – NG6 (DO6) sub plate mounted version. When any actuator drift in a hold position is unacceptable, the model AS-4306-AC or DC voltage- can hold virtual zero leak in all 4 pressure ports. Please refer to attached Catalog Data Page 1.11-2150E. The valve is rated to 5000 psi and 10.5GPM continuous duty, and will hold flow in the cylinder ports in both directions.

Ed V. Askey

For distributors and users who design and provide High Flow Rated Manifold Assemblies, DIN type drop in check cartridges are available in 16mm, 25mm, 32mm and 42 mm sizes – typical model number is CS32-10-0.6-.05-c7.  The C7 connotes checked flow port B to A, reverse flow port A to B.  This is done internally in the CSxx-10 cartridge, so a very straight forward DIN cavity is easily drilled, and the cartridge is held in its’ cavity with our standard Dxx-420-0.6 blank cover.  See section 1.12, page 230E for the 32mm cartridge, page 1.12-445E for the cover, and attached example titled One Way Check Function.

The cartridges and cover are rated to 5500 psi, and max flow rates to 1200 liters/min. (40mm size), and pressure drops are extremely low.  The C7 option has been available for years, but few manifold designers have noticed it sort of hidden in the data pages.  I have used it with one of our distributor sales engineers on three dredging scows operating noticed it sort of hidden in the data pages.  It was in the New York Harbor area for 8 years, where the max pressure is 5500 psi, with flow rates to 240 GPM. Usually the cost is too high for sizes below 25mm, but more than acceptable when flow rates above 300 liters/min and working pressures are to 5500 psi.

Ed V. Askey

Available on special Quotation

1. Hand Lever Operated, with 2 position Detented Actuator, 2 way and 3 way, normally open or normally closed.  Ask for drawings for model AH32061A-S2017, (NG6 sixe) and AH22101A-S2131 (NG10 size).  Our standard hand operated poppet valves come with spring return only.  Frequently, the application may call for the operator to shift the valve into a holding position and leave it for extended periods.  Application examples: tunnel drilling machines, fork lift attachments, forming presses and clamps, hydraulic actuated shut-off valves.

2. Solenoid operated 2 and 3 way valves with a solenoid operated locking function (detent).  Ask for drawing 1.11-52201E and cutaway drawings on the solenoid detent version, and hand knob operated unlocking.  Applications examples are: vice grips on oil drilling platforms, hydraulic freight elevators, self propelled man lifts. Cranes, etc. (outriggers)

3. Solenoid Operated Poppet Valves with position indication (signals poppet or spool shift).  Available with either mechanical or inductive proximity switches, normally open or normally closed.  See attached drawings.  On equipment located and operated in hazardous areas and sites, there may be official governmental standards or requirements involved.  This is the case in W. Europe on certain machine tools.

Please contract Customer Services at 847-566-5700 for model number and prices. Prices are quantity sensitive.

Ed V. Askey
 

We often hear the complaint that “your valves are excellent, but too expensive to apply on Mobile Equipment.” For some applications this may be so and we don’t try to lead you into a battle you won’t win. But Wandfluh does have many successes on mobile equipment applications; it all depends on what operational requirements the user needs, and how badly are they needed. For example, we offer catalog standard flow control valves that can accurately adjust flow rates to as low as 1 cubic inch per minute, pressures down to 15 psi, hold loads with metal to metal poppets down to 3-4 drops per minute, and offer type 316L stainless steel housings and 17-4 spools and threaded adjustments., We can supply solenoid operated valves with virtually any variety of current or voltage, prepare internal parts and seals to operate with a variety of fluids (both internally or externally), combine functions to perform multiple tasks in one assembly, offer a variety of sizes or adapters to fit both international or local dimensions, flanges and thread sizes. We can combine a variety of components into one main assembly of all the required components to perform intricate functions and sequences; and offer remote proportional electronic control of all the required movements or positions. If the user’s design requires the above product and system capability, all these features and functions are no more expensive from Wandfluh then they would be from other capable suppliers; in fact, they are often less expensive from Wandfluh.

Here are some successful applications on or with mobile equipment that Wandfluh offers

1.  Proportional Solenoid Operated Pressure Compensated Control valves.  Will maintain predetermined pressure and flow rate regardless of varying loads on the hydraulic actuators. Typical applications: directional control of fluid motor driven platform loaders, man lifts, conveyors, and fluid pumps. Examples: Aircraft Freight and Baggage Loaders and Transporters; sewer and water pumping systems.

2.  High Flow Rate Solenoid Operated Poppet Valve Cartridges, 2 way normally open or normally closed, block or flow in either direction. This valve can be mounted in-line, or on cylinder head so actuators and can be shut off or opened on signal in either direction.  Examples: Dump Truck Cylinder Lift, Hold (no drift), or Lower; control system to switch fluid motor drive system motors from series circuit to parallel circuit; Crane Outrigger Control position and hold and hold; Fluid Motor Driven Winch or anchor Windless control of heavy duty, high flow rate applications.

3.  High Flow Rate D08 (NG25 size) Proportional Solenoid Operated Directional Control Valve, sub-plate mounted, 4 way 2 and 3 position, closed center or motor spools, rated to 66 GPM, 3500 psi. Priced competitively to authorized Wandfluh distributors. Features highly accurate proportional solenoid operated pressure controls to finely tune a notched slave spool. Can also be fitted with ATEX rated explosion proof solenoids. See attached write up and drawing.

4.  Stand alone DSV (digital smart valve) Amplifier, mounts separately from hydraulic control valve, or rail mount D62/63 series amplifiers where dimensions and mounting locations and/or ambient moisture conditions require water (etc) resistant protection to meet international Protection Code IP67. This unit contains all the performance functions and options offered in the DSV and rail mounted models, installed in a sealed but easy to adjust and run-in separately mounted unit. Typical applications are on highway sand and salt spreaders, material transporters/conveyors, food processing and packing lines, waste pick up machines, automated care wash systems, etc.

5.  Automatic four way two position cycling valves, pressure actuated, nonelectric, offered in two sizes, flow rate to 16 GPM, pressures to 4500 psi. This valve will automatically shift when inlet pressure is supplied to the valve, and downstream actuator pressure reaches an pre-adjustable point, then continuously shifts to the opposite actuator port on pre-set signal. No electric actuation is involved; product is heavy duty, capable of multiple millions of cycles. Typical applications are on trash packers, underground mining machines, gas and liquid pressure boosters or compressors, concrete finishers, and pumpers.

Ed V. Askey

Reference:  Catalog Section 1.6-15E thru 40E for spool type, Catalog Section 1.11-6005-thru 1.11-6160E for poppet type

This style of valve control (actuator) is often overlooked by customers and distributors as a choice for control of hydraulic directional valves employed in hazardous locations where electric power cannot practically be used, such as in tunnel drilling, underground mining, oil refineries, pipeline installations, compressed gas transportation and distribution, and chemical production and transportation.

It is important to note that this type of hydraulic control valve is not always readily available from many hydraulic valve manufacturers, or not offered in a range of sizes, spool/poppet types, CRES treatments, seal selection, and other desirable options such as manual overrides, or housing styles.  Further, our prices are usually competitive with competitors’ product if they are even available.. (Note: several of our steady customers on these items are Vickers distributors).

All the standard Wandfluh directional valve performance features such as lowest internal leakages, balanced poppet design (block or flow in both directions) rate to 5000 psi duty, available in 4 standard sizes, cartridge or sub-plate mounted body styles, are standard on the pneumatic pilot versions also e.g. spools, poppets, seals, end plates, housing, etc, are parts used in the same size, such as solenoid operated, oil pilot operated, etc.

Most standard items can be delivered in 2 to 4 weeks, ARO; options such as viton seals, tite-fit spools, zinc plated housings, etc., in 4-6 weeks.

Please see data pages 1.6-30E (3 sides) on the NG6 (D03) size Spool type model, and 1.11-6140E (2 sides) on the NG6 (D03) poppet type Model.

Ed V. Askey

Wandfluh Solenoid Operated Control Valve.

Unique, often required product option –Extended Manual Over ride Assembly

Re: Catalog Section 1.1               .

All Wandfluh solenoid Operated Valves come standard with Manual Over ride Assemblies.  Most designs are with push pin type over ride assemblies that screw into the end of the solenoid housing, but soft shift models and poppet type on-off models with come standard with an air bleed plug assembly as these models usually require air bleeding of the pressure tube upon installation or service.  The push pin can be installed in lieu of the air bleed type on special option.  See data sheets 1.1-300E, and 1.1-310E in general catalog section 1.1 – solenoids or on website. 

Note that the manual over ride assemblies offer a selection of push pin types for spring offset and release, or air bleed (1.1-300E), and push, spring return and detent (1.1-310E).

The push, spring return and detent can also be supplied with special options such as push type knob, over sized knob, extended shaft, and push – pull stem.  A manual push/release screw-in assembly will extend 38 mm from the solenoid housing, the push and twist stem is 13 mm round, and its surface is gnarled to keep a thumb or finger end from slipping when it is pushed.

The push pin in the assembly is of stainless steel, the male nipple and the housing are of brass.  The seals are viton 75 shore. The protection code rating is IP65.  The air bleed plug is of steel, zinc plated, IP rating is IP67.  The H series of manual over rides are often specified for solenoid operated valve systems on Offshore Marine, Oil Refining and Mining Applications.

Note that the screw-in manual over ride assembly design is also used on Wandfluh Proportional Solenoids, and Explosion Proof Solenoids; in fact we also provide these to several other firms involved in the Fluid Power Industry. 

Ed V. Askey

 

VWS Series of Proportional Solenoid Directional Valves with Integral Pressure Compensation in C1 and C2 actuator ports.

Refer to catalog Data Sheet 1.10-06E ; 1.10-11E, and 1.10-20E (www.wandfluh-us.com) for complete details on this long time successful series.  These proportional valves feature a unique design that internally converts P to C1 or C2 flow to full range pressure compensation, thus sandwich flow controls, in-line flow controls or electronic feedbacks are not required to maintain desired flow rates set by the proportional solenoids, regardless of changes in load pressure. 

They are excellent choices for fluid motor drive circuits, rotary actuators, or large bore equal displacement cylinders, when highly accurate and extremely fast reaction is not a critical requirement, but load and flow rates may vary and a good degree of repeatable and stable flow rate is needed.  Examples are fluid motor driven conveyors, winches, boat propellers, fluid pumps, and self propelled fluid motor driven vehicles.

Since the pressure compensation occurs as “meter out” of the cylinder or motor ports, this also prevents “actuator runaway” (free wheeling) usually eliminates the need for counterbalance valves, and allows smoother low shock braking of he motor.

Response times will be necessarily slower than on direct acting non pressure compensated proportional valves, and pressure drops will be higher, but repeatability will still be in the area of +/- 2%, and low minimum flow rates can be achieved.  See data pages for performance curves on flow rate adjustment vs. current input, and pressure compensated flow rates vs. working pressure.

Ed V. Askey
 

Refer to catalog data pages 1.4-11E, 20E, 30E, & 40E.

Some years ago we prepared a sales training outline on the Wandfluh Soft Shift Valve series and delivered it at various Distributor Sales Meetings. We had considerable early success, and soft shift type sales grew at a good rate. Most customers knew of the fact that direct solenoid operated spool valves cause noticeable compressive “shifting shock” when energizing, and decompressive “shifting shock” when de-energizing.  The noise level was hard on machine operating personnel, and caused damage to the production parts, as well as decreasing the working life of many hydraulic components such as hose, fittings, relief valves, and pumps, and in every instance the soft shift valve greatly improved on these problems.  See attached list of successful soft shift valve applications.  All are successful, most are still active applications.

However, when sales growth became stagnant, mostly due to steady improvement and new offerings of proportional valves and companion electronics, our soft shift valve series became memory to many.  As we have benefited from the growth of proportional valves and electronics, this has not been a loss; however, we continue to see or hear about applications that can benefit by using soft shift valves, and they are often the proper choice over a more expensive proportional directional control system.  A good application, is the need to smoothly reduce shifting shock in the start- -stop- and reverse modes, when actuator profiling and variable flow rates or pressure are not critical control requirements.  Due to the Wandfluh 5 chambered body and 4 tapered spool lands design, our standard soft shift valves do a good job of reducing the shifting shock in both directions at a sizeable price reduction when compared  to an electronic proportional valve control system.  The soft shift spool system is easier to install, run-in, and service, and can easily be added to an existing direct solenoid operated system by merely replacing the standard sub-plate mounted valve with the soft-shift version.  Mounting patterns, and subplates remain the same, solenoids, and other system components remain the same.      

SUCCESSFUL SOFT SHIFT VALVE APPLICATIONS
    
A.   In-Plant Production Machinery and Processes
   
1.  Aluminum and Brass Extrusion & Rolling Machines – noise reduction, shock      reduction, improve production quality, decrease components repair costs.

2. High Speed Small Part Plastic Molding Presses – noise reduction, shock reduction, (keeps machine operators from quitting due to noise levels) improve production quality, increase hydraulic components life.

3.Platform Grinding Machines – shifting shock reduction, improve grinding quality.

4.Plastic Pipe Welding Machine – reduce tank line decompression shock that was causing heat exchanger to fail prematurely, relief valve to wear quickly.

5.Hydraulic Hose/Fitting Swaging Machines, Staking Presses, Bearing Presses –  reduce decompression shock when cylinder pressure released, reduce shock noise. 

B.  Test Benches and fixtures.

1.    Hydraulic Components Test Benches – reduce noise, reduce shock, protest new test specimens, gauges, and other read outs.

2.    Specially designed fixtures for specific components to be tested.

3.    Hi-Speed Rotary Actuator control on Wood Sander.

C.  On site, Heavy Duty Trash Grinding and Crushing Machine.  Reduce shock and noise, improve hydraulic and structure cycle life.

D. High Cycle Press and Extrusion Machines – noise reduction, vibration reduction, improve part quality.  Often a feed and ejection function is added and also needs dampening

E.  Mobile Equipment

1.  Off – Highway heavy duty fork lift. Used as a deceleration valve to smooth cylinder       start- start  when loading-unloading’  4 way, 2 position, double solenoid models both NG6 and NG10 sizes

2.   Paving Machine. Cylinder driven screed moves back and forth across  newly laid asbestos, eliminates shock, smooths surface.

3.   Pleasure Boat Transporter.  Soft shifts positioning and clamping cylinders, eliminates  shock that could damage sensitive instruments, etc.

4.   Mobile Hydraulic Crane.  Soft shift valve controls hydraulic cylinder/or motor that rotates (swings) boom left or right.  Smooth start-stop-rotation  required, especially on man-in-bucket cranes.

F.  Rudder Control, marine steering systems.   Soft shift valve controls hydraulic cylinders in  response to bridge or automatic compass signals

G..  Remote  Control , on-off, of material conveyor..  Stop or start shift must be smooth or mat’l may be jolted off conveyor belt.

Ed V. Askey