For more complete product information see catalog data pages 2.6-666E, 2.6-667E, 2.6-645E, 2.6-646E, and electronic amplifier pages 1.13-75E, 1.13-240E.

This unit uses a 60mm proportional solenoid, available in 12 or 24 VDC, it includes a push type manual over ride, and is enclosed in a flange mount zinc plated steel solenoid housing.  It is available with a selection of electrical connectors including the standard DIN 43650 style.  Stand Wandfluh amplifiers and companion electronics can be used to drive the solenoid. 

The unique Wandfluh pressure balanced metering spool allows a direct solenoid operated design which assures accurate, smooth and fast response to a signal change.  A special data page, 2.6-114 (2 sides) and operating graphs are available on request from the Wandfluh, Mundelein, IL office.

Typical applications for this valve include variable speed control of fluid motor driven conveyors, lowing speed control of weight loaded hydraulic presses, variable speed control of fluid motor driven water pumps and boosters, fluid transfer systems, and mobile equipment fan drive systems.

Ed V. Askey

The main feature of the Wandfluh Accumulator or Pump Unloading Valve is that it offers adjustable pressure control for both the unloading (dump pump flow to Tank) and reloading (rebuild system pressure) functions.  Most unloading valve circuits offer only an unloading pressure adjustment and a fixed not readily adjustable reloading pressure.  The difference between the unloading and reloading pressure is example, typical unload-reload ratio for clamping circuits (hold at high pressure) is 90%; an example would be unload at 1000psi, reload at 900psi, but this is an uncommonly high ratio for many pressure holding circuits, and not practical for fast approach slow feed circuits where there is time to make up stored low pressure volume at low power input, or demand for holding pressure is sporadic and used only for emergencies.  Only one Wandfluh dual Adjustment Unloading valve is required for a wide variety of accumulator pressure control applications, and the desired unload-reload ratio can be re adjusted in the field if unload-reload requirements change.

Other important features are:
1.  Internal spook leakage is extremely low (see page 2 of data page) and thus do net bleed down the charged accumulator quickly and the pressure or charging pump does not have to operate often.
2.  The valve comes in 2 sizes, NG6 (NFPA D03) and NG10 (NFPA d05, and mounts on standard NFPA sub-plates.
3.  The NG6 size can used to pilot larger DIN type poppet vlaves that may require a variety of pilot pressures and flow rates depending on the ratio choices of different sizes of DIN poppet valves. 
4.  Both sizes are rated continuous duty to 5000 psi, peak to 5800 psi. 
5.  All working parts are of steel, sub-plates can be provided in steel or high grade aluminum, pressure adjustment valves have lock nuts; for fine resolution, 3 pressure adjustment ranges are offered as standard, seals are Buna N, or Viton; EP (ethelene propalene) on special quote.
6.  If valves are to be exposed to wet, humid, icy conditions, or salt water, ask us for quotation on CRES surface finishes or Type 316 L stainless steel external parts.

Ed V. Askey
 

New Product Introduction:  Model Number MDPPM16-40-Y-G24-MSA37/19 Direct Acting Proportional Pressure Reducing-Relieving Valve for slip-In-Cartridge cavity.  For low flow rate, lowest pressure adjustment, lowest internal leakage applications.

Ask for data page 2.3-671E on this special application model. We have produced this model for several OEM customers. It is used on pilot control circuits were accurate pressure adjustment is required at very low flow rates and pressure adjustments, and lowest internal leakage is also a critical requirement.

It is rated to accept up to 60 bar (879 psi) input pressure (P port), and adjust downstream (A port) pressure to as low as 1 bar (15 psi) accurately and repeatedly. Internal leakage (past P port) is rated to as low as 30 cc/minute (nominal) with 142 SUS viscosity fluid.

Two pressure adjustments are offered: 1 to 25 bar with the PI29 solenoid, and 1 to 48 bar, with the PI35 solenoid. See pressure operating curves, and dimensions on page 2 of data sheet 2.3-671E. Standard voltages are 12 and 24 volt DC. An explosion proof solenoid model that meets ATEX Standards (Zones 1 & 2) is available on special quotation.

Note: this new cartridge fits an 0.11 mm cavity and a special 3 ported housing for it is available. Ask for Wandfluh cavity drawing 1.1325.4, or ported housing KR-1630-A-S04.

Ed V. Askey

In addition to our cataloged NG3, NG4, NG6, and NG10 solenoid operated spool type proportional directional valves, we also offer a High Flow Rate DO8 (NG25) size proportional solenoid operated contol valve to authorized distributors.   See data page on model AVPWS4D251-250-ti-G24-HB4.5. 

We continue to ship more of these every month, and have reordered the main valve sections from Nachi, due to increasing demand.  These DO8 sized valves were offered by Wandfluh many years ago, but removed from the line when the main spool body castings became unavailable in Switzerland.  Upon increasing requests, we developed an agreement with Nachi US to supply us the body sections with proportional fit spools, and adapted our standard proportional pressure control sandwiches to pilot them.  Our net price to an authorized  distributor is among the best on the market for a DO8 size (NG25) proportional directional control valve, double solenoid, 4 way 3 position, 24 VDC, closed center or motor spool.  These valves are rated to 66 GPM and 250 bar, and we have excellent performance reports from the field.  Standard Wandfluh Electronics drive these valves.

These valves can readily be supplied with the EEx me ll explosion proof, ATEX rated, European Norm solenoids, now becoming accepted worldwide (though not yet with UL/CSA approvals).  The pilot sandwich shown (model AEPSVdAB6-G24-0.6) would simply be replaced with a model BDPCS-AB-20-0.6-G24/T4- (see data sheet 2.3.740E) shown in the newest volume 13 and up catalogs.  Best of all, delivery is excellent!

If you’re interested, Bill Smith can work up a quote for you based on the net price sheet with the explosion proof solenoids on the NG6 pilot pressure control sandwich. 

Ed Askey
 

These units feature the proven QNPPM33-63-G12/G24 Screw-In threaded Cartridge, which allows higher flow rates and working pressures,  installed in steel sub-plate or sandwich mount housings.  See data page 2.6-650E for complete operating detail.  Also available with Integrated Electronics installed in the Solenoid Housing  (DSV Smart Valve).  See data page 2.6-660E.

These units supercede the previous model series AEMR-N or P- 10/2-40-G12/G24, a long time Wandfluh proportional flow control valve rated to 10.4 GPM and 3650 psi, which will remain available to support the large number of units now in the field, but we recommend installing the new units on neo generation designs, and wherever there is no problem in adapting existing design inputs to new flow rate/pressure ranges.  Also, the new style valves are priced lower than the older style.

Other advantages of the new screw-in cartridge design are:  faster and easier installation or removal of the screw-in cartridge, zinc plated steel solenoid housing for better corrosion resistance, common M33x2 metric cavity will accept a throttle valve version rather than pressure compensated version if required, or the SVS/X33 series of 2 way poppet type shut-off or dump valves.  This simplifies inventory requirements, and circuit installation procedures where all three types of valves may be required.

Ed V. Askey

The DSV Standalone offers all the performance options of the SD62 series, and can easily be installed and adjusted with an IBM compatible PC, and a set of inexpensive cable connections.  A free PASO installation program can be down loaded from the Wandfluh Website (http://www.wandfluh.com/en/downloads.html).  On request the unit can be programmed before shipment for a minimal fee.

The exact IP67 International Protection Standard requires protection against ingress of dust, complete protection against contact, and protection against water when the enclosure is totally immersed under defined conditions of pressure and time. Other advantages are:

• Accepts either voltage or current adjustable preset values (command input)
• Adjustable Ramps for both up and down, adjustable gain, offset, and inversion
• Five different operation modes (i.e. uni-polar 1or 2 solenoid, bi-polar 1 or 2 solenoid
• Uni-polar control 2 concurrent solenoid functions
• Adjustable Dither, both frequency and amplitude
• Adjustable Dead Band

For additional information on these functions, and technical data, refer to the SD62 data sheets 1.13-100E, or the SD62 Operating Instructions (can be downloaded from the internet). Also, refer to the DSV data sheets 1.13-50109E.

As you can see, there are many options and functions available so currently we request that you discuss your applications for this new product with us, and we will then present you with model numbering and net distributor pricing.

Ed V. Askey
 

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

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

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