Spare Parts

Sl.No. Description Qty.
1 Grub Screw 1
2 Soln. Optd. D.C.V. 1
3 Grub Screw 1
4 S.H.C. Screw Plug 4
5 Bonded Seal 1
6 S.H.C. Screw 1
7 Bonded Seal 1
* 8 O' Ring 1
9 Backup Ring 1
* 10 O' Ring 1
11 Check Bush 1
12 Housing 1
13 Poppet NG20 1
14 Spring 1
* 15 O' Ring 1
16 Spring Retainer 1
17 S.H.C. Screw 4
18 S.H.C. Screw 4
19 Cap 1
* 20 O' Ring 1
21 S.H.C. Screw 4
22 Spring Ring 1
Sl.No. Description Qty.
23 Key 1
24 Spool 1
25 Pilot Piston 1
26 Circlip (External) 1
* 27 O'Ring 1
28 Spring Casing 1
29 Spring 1
30 Spring Retainer 2
31 Body 1
32 Main Bush 1
* 33 O' Ring 2
34 Decom Poppet 1
35 Backup Ring 1
* 36 O' Ring 1
37 Main Poppet 1
38 Spring 1
* 39 O' Ring 1
40 End Cover 2
41 Screw 1
* 42 O' Ring 1
43 Cap 1
44 Pilot Housing 1

Note : * Recommended Spares
While ordering the spares give complete details of Model Code punched on the valve body.

 

Maintenance Manual

MODEL : DES (Size 20)

Operation and Maintenance Instructions :

Solenoid operated pressure holding directional control valve require very little attention from the user provided the valve is operated within the specified conditions. However following guide lines be followed while storage, operation, commissioning and maintenance.

Storage :

For storage see that the valve is properly covered and well lubricated. This will prevent the ingress of dust and dirt in working mechanism of the valve and it will be easy to install the same.

Operation :

This DCV is designed for single acting cylinders which are supposed to hold pressure. When in neutral condition i.e. vertical position of the lever port P is opened to port A. Port A may be used as a pressure port or connected to port P of another pressure holding DCV i.e. the valves can be connected in series for independent multiple single acting cylinder operation. Pilot line is connected to the X port. When one of the solenoid is energized the spool moves outward blocking port A and connecting port P to port B. The oil flows via the check valve. This forms the forward stroke of the cylinder. During curing cycle the DCV is brought to neutral condition by de-energizing the solenoid. The poppet type check valves ensure perfect pressure holding. For return stroke of the ram, the other solenoid is energized, this pushes the spool inward. The decom-poppet opens prior to main poppet opening thus decaying the high pressure. When the pressure decays below a certain value the main poppet opens.

Commissioning :

Following points be remembered while commissioning the valve;

Inlet line is to be connected to port P and port A and port B form the service ports, port B being connected to single acting cylinder while port A being used for connecting multiple single acting cylinder independently. Port C is provided for connecting a pressure regulating valve. Pressure holding DCV may be also supplied with a optional Relief valve. Port G may be used to check the pressure at B line.

Maintenance :

Lever operated pressure holding DCV does not need any major attention, but to ensure its efficient working and long life it is necessary that following points be kept in mind.

The oil must be of prime quality and clean as per ISO code 16/13.

The oil must be periodically changed. Use of contaminated oil may cause faster spool wear leading to excessive leakage and reduced life.

The oil temperature be within specified range i.e. -20 C to +70 C.

 

All rights reserved.
Subject to revision.

Regd. office & Works :
78-80, Machhe Industrial Estate, Machhe, Belgaum - 590 014. Karnataka, INDIA. 
Phone :
+91-0831-2411001.  Fax : +91-0831-2411002 ,  
E-mail :
 
polyhydron@vsnl.com ,  Website :  www.polyhydron.com

 

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Polyhydron Pvt. Ltd, Belgaum, India.

Updated on February 04, 2015 03:05 pm .