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Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color

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Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color

China Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color supplier

Large Image :  Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color

Product Details:

Place of Origin: China
Brand Name: Hengli
Model Number: Type GWEH10,16,25../6B2

Payment & Shipping Terms:

Minimum Order Quantity: 1 set
Price: Negotiable
Packaging Details: Wooden packing
Delivery Time: 5-30 days upon order quantity
Payment Terms: T/T, Western Union, MoneyGram
Supply Ability: 50 set / 30 days
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Detailed Product Description
Material: C.S/SS Seal: NBR/FKM
Pressure: 350 Bar Fluid Temperature Range: -30 To +80 (NBR Seal)/-20 To +80 (FKM Seal) ℃

 

Explosion-proof electro-hydraulic directional valve

Type GWEH10,16,25../6B2

Features

- Valves used to control the start, stop and direction of a fluid flow

- Electro-hydraulic operation (WEH)

- 4/2- or 4/3-way version

- Porting pattern to DIN 24 340 form A, ISO 4401 and CETOP-RP 121 H

- Pressure-tight chamber needs not to be opened for a coil change

 

Function and configuration

The GWEH../6B2..type explosion-proof electro-hydraulic directional valve is a directional valve taking the electro-hydraulic solenoid valve as the pilot control; it applies the plate-type connection, and the connection dimension is in accordance with the DIN 2430 and ISO 4401 standards. There are many different performances and additional devices for choice.

Valves of type GWEH../6B2.. are directional spool valves with electrohydraulic operation, using the directional explosion-resistant valve as pilot control. They control the start, stop and direction of a fluid flow.

The directional valves basically consist of the main explosion-resistant valve with housing (1), main control spool (2), one or two return springs, and the pilot explosion-resistant valve (4) with one or two solenoids.

The main control spool (2) is held in the neutral or in the initial position either by the springs or by means of pressure. Pilot explosion-resistant valve has wet DC or AC solenoids (5), optional. The main control spool is shifted by pilot explosion-resistant valve (4).

 

There are four patterns on supply and drain of control oil, see the function diagram.

Following are descriptions of various types of valves:

1. Main valves are spring centered-type 3-position four-way directional valves

The main control spool (2) is held in the neutral position by two return springs (3), and the two spring chambers (6) are connected to the tank via the pilot explosion-resistant valve (4). The pilot oil is supplied via the pilot line (7). When the pilot explosion-resistant valve (4) switches direction (one solenoid of the pilot explosion-resistant valve energizes), the pilot fluid acts on the one end of the main spool (2) and pushes it (2) to move and the required port is connected, thus the flow direction of the fluid is changed.

When the solenoid is de-energized, the pilot spool returns to its initial position (exception: impulse valve). The spring chambers (6) are connected to tank by pilot explosion-resistant valve (4). Under the force of spring, the spool returns to its neutral position. The oil in the spring chamber (6) flows to return line from external port Y or internal line T via the pilot valve (4).

Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color

1- Main valve body

2- Main valve spool

3- Reset spring

4- Pilot Explosion protection solenoid valve

5- Explosion protection solenoid

6- Spring chamber

7- Control oil passage

 

2. Main valves are hydraulic centered-type 3-position four-way directional valves

The main control spool (2) is held in the neutral position by pressure oil acting on the two end faces, and is located in the neutral position by a locating sleeve(7).

By removing the pressure from one of the spool (2) ends, the main control spool (2) is moved to the shifted position. The fluid in unload chamber flows into Y channel via the pilot valve(4) , and the internal drain fluid direct return to tank via port L.

Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color

1- Main valve body

2- Main valve spool

3- Spring

4- Pilot Explosion protection solenoid valve

5- Explosion protection solenoid

6- Spring chamber

7- Positioning sleeve

 

2-position four-way directional valves

( this kind of calve has four different structures and Types)

1. Type G4WEH.../6B2...

This kind of pilot valve and main valve have a reset spring each, resetting by spring force.

2. Type G4WEH...H.../6B2...

This kind of valve has a reset spring, making pilot valve spool stay in initial position. Main valve spools change directions under effect of pressure oil.

3. Type G4WEH...H.../O6B2...

This kind of valve has two solenoids. There are no reset springs in pilot valves and main valves, thus using solenoids and pressure oil to make pilot valves and main valve spools change directions. Therefore, at least one solenoid shall be under working sate.

4. Type G4WEH...H.../OF6B2...

This kind of valve has two solenoids and locators which makes pilot valve spools stay in working position(impulse valves). Main valve spools have no locating devices, moving downward to corresponding working positions under effect of pressure oil.

Structure 2, 3 and 4 preceding are hydraulic reset. Main valve spools can stay in the working position only under the effect of pressure oil.

Throttle insert

The use of a throttle insert is required if the pilot oil supply in the P channel of the pilot valve is to be limited. This throttle is inserted in the P channel of the pilot valve.

Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color

 

Pilot oil supply:

1. Type GWEH10.../6B2..

(1) Conversion between internal supply and external supply:

P hole on the top of main valve bodies with M6 bolt(2) is external supply and with M6 bolt (2)dismantled is internal supply.

(2) Conversion between internal drain and external drain:

Dismounting plug screws and installing M6 bolt(2) is external drain; Dismounting M6 bolt(2) is internal drain.

Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color

 

2. Type GWEH16.../6B2..

(1) Conversion between internal supply and external supply:

Dismounting plug screw (10) form P hole on the undersurface of main valves and installing M6 bolt(9) is internal supply. Dismounting M6 plug bolt (9) id internal supply.

(2) Conversion between internal drain and external drain:

10 Pilot valve Dismounting plug screw(10) form T hole on the top of main valves and installing M6 plug bolt(9) is internal drain. Dismounting M6 bolt(9) is external drain.

Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color

 

3. Type GWEH25.../6B2..

(1) Conversion between internal supply and external supply:

P hole on the top of main valve bodies with M6 bolt(6) is external supply and with M6 bolt (6)dismantled is internal supply.

(2) Conversion between internal drain and external drain:

Dismounting plug bolt(6) form T hole on the top of main valves. Dismounting M6 bolt(6) is external drain.

Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color

 

Switching time adjustment:

In order to influence the switching time of the main valve a double throttle check valve has to be fitted between pilot valves and main valves to control oil supply from pilot valves into main valve spools, thus adjusting the switching time of main valves.

Regulating bolt rotation clockwise, the time for switching of main valves is long, otherwise the time is short.

The throttle check valve has two kinds: meter-in throttling and meter-out throttling. If there is a need of changing meter-in throttling into meter-out throttling, just install the valve after rotating 180°around the longitudinal axis again and then install pilot valves.

Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color

1- Main valve

4- Pilot valve

11- Switching time regulator(Z2FS6)

12- Meter-out throttling

13- Meter-in throttling

16- Set screw M5×L GB/T70.1-10.9 grade, the length of L is determined by height stacked, tightening torque 8.9 Nm.

 

Pressure reducing valves:

The pressure reducing valve (8) must be used it the pilot pressure is higher than 250 bar .Pressure reducing ratio of constant-ratio pressure reducing valves(D1)1:0.66.

Pressure reducing pressure of constant-ratio pressure reducing valves shall not exceed 40bar.

Minimum control pressure of technical specifications shall improve 1/0.66=1.515 after installing bottom plate pressure reducing valves.

Constant-ratio pressure reducing valves shall not be used when controlling internal oil drain and using back pressure valves(P0.45) with control pressure decreased to 3bar.

Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color

1- Main valve

4- Pilot valve

11- Switching time regulator

17- Pressure reducing valve

18- Bolt M5×105 GB/T70.1-10.9

 

Specifications

Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color

Note:

1. When the spools of type GWEH10../6B2.. is C, Z, F, G, H, P, T ,V and so on, if the pilot oil is internal supply, the pilot oil should be external drain. And enough back pressure should be exerted on the return oil port T (must not be on the Port Y) so that the valve can change directions reliably.

2. When the pilot pressure is higher than 250bar (It will be main pressure when the version is supply internal), the pressure reducing valve must be used.

3. G1 Explosion protection grade EX d Ⅰ Mb; G2 Explosion protection grade EX d Ⅱ C T4 Gb

 

Electro - Hydraulic Control Valve , Hydraulic Directional Valve In Blue Color

Note:

1. For function of GWEH16-25 such as C, Z, F, G, H, P, T, V, etc., if applying control oil internal sup, please try to use external add enough back pressure on return port T( port Y shall not have back pressure) to ensure valves can reverse properly.

2. Pressure reducing valves shall be applied when control pressure exceeds 250 bar.

3. G1 Explosion protection grade EX d Ⅰ Mb; G2 Explosion protection grade EX d Ⅱ C T4 Gb

 

Technical details

Size mm Nominal pressure MPa Max.flow L/min
10 31.5 160
16 28/31.5 300
25 28/31.5 650
32 28/31.5 1100

 

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