Elwood Dalian
117 Youhao St. ∙ Jinzhou district ∙ 116100
Dalian ∙ China ∙ +86 411-6232-8880 ∙ Elwood.Dalian@gmail.com
         
DIRECTIONAL CONTROL VALVES
2-, 3- AND 4-WAY DIN POPPET SERIES
Features of our Poppet Directional Valves

The Elwood line of DIN Poppet Directional Valves is a modern controls concept in water hydraulics-
a line of 2-, 3- and 4-way control valves incorporating the following features:

Zero Leakage - Positive, drop tight sealing is achieved by poppet type plunger assemblies with resilient seating discs, which close against heat treated stainless steel mitered seats.

Extended Poppet Seal Life - The dynamic seals nevercross ports during operation, therefore, cannot extrude into ports. These seals are wear compensating.

Minimal Valve Space Requirements - Compact subplate mounted design reduces space requirements by as much as 50%.

Easy Valve Maintenance - All normal maintenance can be performed from the top side of the valve without removing the valve from the system. The internals are designed eliminating all “press” fitted as ell as “selectively” locked parts or assemblies. Cavities conform to international DIN standards and are sleeved to facilitate seal and parts replacement.

Directional Control Function Flexibility - Main control valve function can be changed by removing the top plate and relocating the plugs in the pilot fluid passageways.

Less Inventory Required - Because such parts as poppets, seals, etc., are interchangeable between 2-, 3- and 4-way valves, spare parts inventory requirements are minimized. Exchanging the poppet assembly replaces all dynamic seals.

Built in Flow Controls - Totally independent “meter-in” and/or “meter-out” flow control from either port is accomplished by simply limiting the poppet stroke by use of the externally accessible stainless steel flow control screw.

Maximum Efficiency of Fluid Flow - The design of the passage-ways through Elwood Directional Control Valves,
results in outstanding valve efficiency and minimum pressure drops, allowing smaller Elwood valve size selection for most applications. Thus, it is smaller in comparison to competitive valves and requires less manifold space.

Pilot Designed to Suit Application - For heavy duty mill type applications, our standard air actuated packed spool
pilot valve (Bulletin E82) is furnished. This valve requires no secondary operating media.

Six Poppet Models Available - Designed for dual speed applications.

 
Directional Control Valve Design Features

STAINLESS STEEL FLOW CONTROL SCREW IS EXTERNALLY ADJUSTABLE

TOP PLATE IS EASILY REMOVABLE FOR POPPET INSPECTION OR MAINTENANCE

MULTI-FUNCTION TOP PLATE CONTAINS ALL NECESSARY PILOT HOLES FOR ANY DESIRED FUNCTION

2-PIECE REPLACEABLE STAINLESS STEEL SLEEVES

STAINLESS STEEL POPPET ASSEMBLY

POLYMER DYNAMIC SEALS DO NOT CROSS PORTS

REPLACEABLE, REVERSIBLE POLYMER DISC
FLOW VOLUME CAN BE METERED (VIA FLOW CONTROL SCREW) TO SUIT ANY CYLINDER DIFFERENTIAL
SUBPLATE MOUNTED

BY PLUGGING CERTAIN PILOT HOLES, THUS REROUTING PILOT LINES, ANY DESIRED FLOW SEQUENCE CAN BE ACHIEVED (See Next Box)

OUTSIDE POLYMER
PISTON SEAL IS LOADED TO THE VALVE BORE BY AN INNER SQUARE ELASTOMER RING WHICH COMPENSATES FOR PRESSURE AND WEAR ON THE OUTSIDE SEAL
WHEN PILOT LINE IS SWITCHED TO EXHAUST, LIFT FORCE WILL RAISE PLUNGER AND PERMIT FLOW
REPLACEABLE,
REVERSIBLE,
RESILIENT POLYMER DISC

 

BUILT-IN DECELERATION
AND SHOCK ALLEVIATION

Technical Data
Minimum Operating Pressure 400 PSI (28 bar) (Consult factory for pressures below 400 PSI)
Hydraulic Media HWCF, 97/3 Soluble Oil in Water, Synthetics, Mineral Oils and Kerosene
Viscosity Range at 100º F (38º C) 20 SSU (1.2 Cst.) to 1800 SSU (385 Cst.)
Maximum Pressure Rating 2 Ranges 3000 PSI (207 Bar), 6000 PSI (414 Bar)
Fluid Temperature Range HWFC 35º to 150º F (2º to 65º C) Mineral Oil 5º to 150º F (-15º to 65º C)
Recommended Filtration Minimum - 149 Micron (100 mesh) Recommended - 74 Micron (200 mesh) Optimal - 40 Micron
Available Valve Finishes
Finish Corrosion Resistance Description
Carbon Steel N / A Standard Valve (Painted Surface)
Black Oxide Good Conversion coating by chemical reaction to form a protective surface for corrosion resistance
Black “T” Better Elwood’s Black “T” surface treatment is as good as 18-8 stainless steel against salt solution spray. Corrosion resistance according to ASTMB117, which is a salt spray test, shows that it is significantly better than hard chrome and electroless nickel.
Stainless Steel Best
Additional Poppet Valve Feature

Versatility:
Here are a few examples of the versatility of the Elwood Valve, illustrating multi-purpose valves. As many as nine (9) positions are available in one valve, though normally, only 4 to 5 positions are used. This flexibility eliminates the need for additional valving and manifold space. Any existing standard 3-position Elwood Valve can be converted to provide multi-position valves. This offers considerable versatility in the field, as design requirements change, without requiring manifold or piping changes. Basic valves are interchangeable, therefore spares are minimized. In addition to the illustrated functions, several others are available; contact Elwood.

Features:
This example demonstrates how circuit design, manifolding and piping are simplified. This is achieved by eliminating the need for piped-in or manifolded speed and flow control valves. The Elwood Valves have integral externally adjustable flow control screws.

Main Pilot Valve

Heavy-Duty Durable Design Using
Corrosion-Resistant Materials:

Seals are self-compensating. The same piston rings are used throughout. Spool is hydraulic-balanced, assuring uniform wear and eliminates concentricity problems. Designed with no-lap fitted parts.

Versatile:
Changing the main valve function is accomplished by changing pilot spool and plugs. Multiple positions of the main valve are achieved by mounting an additional pilot valve. For additional pilot valve information see Bulletin E82. Recommended air supply: 60 PSI (4 bar) minimum; 120 PSI (8 bar) maximum inrush current for 110/120 Volt 50/60 Hz and 220/240 Volt 50/60 Hz is 87 VA, holding 30 VA.

Electronic Connector:

TYPE 11B TYPE 11D
Positive
(High)
Negative
(Neutral)
Standard (DIN 43650) Hirschmann Type
 
TYPE 11E
Optional
Brad-Harrison Type

 

 

1. Green
2. Black
3. White

Hirschmann type industrial
electrical connector pattern, form B, standard for MAC, code 11B

 

 
Valve Sizing

Valve sizing and selection requires consideration in two (2) areas:

1) PIPE VELOCITY & PRESSURE DROP

Allowable maximum pipe velocity is based on various system considerations and fluid velocity and
resultant pressure drop. Generally, the following flow rates are acceptable parameters for most
piping systems:

• for short-to-medium length runs, 26 ft/sec (8 m/sec.), and a maximum of 30 ft/sec. (9 m/sec.)

• for long piping runs, 20 ft/sec. (6.5 m/sec.)

These parameters consider pressure drop. However, to do a complete engineering analysis, one
would need to calculate the length of actual pipe runs, factoring in the number of elbows, valves,
etc., to determine the system pressure drop. In this case, Cranes Reference or other reference can
be used.

2) PRESSURE DROP THROUGH THE VALVE

For correct valve sizing, it is necessary to determine pressure drop through the valve. Due to the fact
that not all manufacturers clearly state their valve flow characteristics, it may not seem easy to
determine the pressure drop. But, it is simple when the Cv is given. The most effective method for
comparing alternative valves is by the Cv factors that valve manufacturers provide for each individual
valve. This enables engineers to calculate and compare pressure drops at system design flow rates.
This will result in selecting valves with a smaller envelope, but superior internal design and flow
characteristics and lower valve and installation costs.

Cv Factor for Manifold Mounted Vavles
& 2-Way 3-Way 4-Way
DIN 16 5.2 3.2 5.3
DIN 25 11.3 7.9 9.3
DIN 32 16.5 10.5 12.2
DIN 40 29 27 24.5
DIN 50 52.5 49.3 37
DIN 63 75 - -

Total Cv for one pass thru the valve body, pressure to cylinder or cylinder return.