The 4/2-and 4/3-way directly operated proportional directional valves, Spool with electrical position feedback. Type BFWE and BFWNE
Nominal size 6 and 10 Component series 2X Maximum operating pressure 315bar Maximum flow 80L/min DN 6 (DN6) Maximum flow 80L/min DN 10 (DN1O)
1) To have a long service life for the component, we strongly suggest the fluid should be well-filtered frequently. 2) Please comply with European Standards DIN EN 563 and DIN EN 982 must be taken into account! 3) With HOYEA Machinery Manufacture CO. LTD. control electronics
The 4/2-way and 4)3-way proportional directional valves are designed as direct-operated components for subplate mounting. They are actuated by means of proportional solenoid with central removable coil. The solenoid are controlled either by external control electronics (type BFWE) or Integrated control electronics (type BFWNE)
Design: The valves basically consist of: —Body (1) with mounting surface Control spool (2) with compression springs (3 and 4) Solenoids (5 and 6) with central coil Optional integrated electronics (7)
Function: —When solenoids (5 and 6) do not work, the control spool (2)is held in the central position by compression springs (3 and 4) —Direct actuation 01 the control spool (2) by energising a proportional solenoid E.g. When the solenoid 'b" power is on (6) — The control spool (2) is moved to the left in proportion to the electrical input signal —connection from P to A and B to T via orifice-like Cross sections with progressive flow characteristics — When the solenoid power is off (6) The control spool (2) is returned to the central position by compression spring (3)
In theory, the function of this valve is the same to the valve with 3 positions. However, the valves with 2 positions are only fitted with solenoid "a" (5) Instead of the 2nd proportional solenoid a plug (11)is fitted with a cover for DN 6 or for DN 10(11).
Note for type BFW-02...2XI/...: Draining of tank line is to be avoided. With the appropriate installation conditions, a back pressure valve is to be installed (back pressure approx 2 bar).
Com. Value: Positive command value (O to 10 V or 12 to 20 mA) at D and reference potential to E causes flow from P to A and B to T. Negative command value (O to 10 V or l2 to 4 mA) at D and reference potential to E causes flow from P to Band A to T. For valves with a solenoid on side "a (spool variants EA and WA) a positive command value at 0 and reference potential to E (NS 6: 4 to 20 mA and NS 10: l2to2OmA)causes flow from P to B and A to T. Actual value The actual value (0—1OV or l2mA) on the F.C enables the connection from port P to port A. Connection cable Recommendation -up to 25 m cable length type LiYCY 5 x 0.75 mm -up to 50 m cable length type LiYCY 5 x 1 .0mm External diameter 6.5 to 11 mm Connect screen to PE only on the supply side
Introductions: The electrical signal launched from controlled amplifier (e.g.actual value) must not be used for the safety protection of the switch device. 1.Contacts PE should be linked to the low-temperature subject and valve body 2 .Ramp time could be adjustable within the scope O—02 5s outside, as well as Tup and Tdown 3.Zero point outside is adjustable.