Spare Parts

Sl.No. Description Qty.
1 Solenoid Valve 1
2 Spring casing 1
* 3 O' Ring 1
4 Cap 1
5 Adjusting Screw 1
6 Check Nut 1
* 7 Spring 1
8 Body 1
9 Socket Head Plug 1
* 10 O' Ring 1
* 11 O' Ring 2
* 12 Backup Ring 4
* 13 Spring 1
14 Poppet 1
15 Bush 1
* 16 O' Ring 2
Sl.No. Description Qty.
17 Choke ( 0.8) 1
* 18 O' Ring 2
19 Plug 1
* 20 Bonded Seal 1
* 21 O' Ring 1
* 22 O' Ring 2
23 Choke ( 1) 1
24 Plug 1
* 25 Bonded Seal 1
26 Cover 1
* 27 O' Ring 1
28 Unloading Pin 1
29 Valve Seat 1
* 30 O' Ring 1
* 31 O' Ring 1

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

Maintenance Manual

MODEL : PPRU

Operation and Maintenance Instructions :

Polyhydron make Pilot Operated Pressure Relief cum Unloading valves are reliable hence require very little attention from user. However it is necessary that following points must be kept in mind while storage, assembly, commissioning and maintenance.

Storage :

It is necessary that during storage the valve must be well lubricated and properly covered. This will prevent ingress of dirt/dust in the working mechanism and during commissioning it will be easy to install the same.

Operation :

Pilot operated. Pressure Relief Cum Unloading valves are designed mainly to unload low pressure pump at pre-determined pressure. These are used in hydraulic circuits to offer high speeds up to pre-determined pressure level. Remote pressure signal unloads part of original source to tank at valve setting.

Two stage poppet type construction.

Allows free flow from port ‘A’ to port ‘B’.

This valve can be unloaded by applying remote pressure to it’s port ‘P’.

Models with internal pilot drain and external pilot drain with provision for solenoid unloading are available.

Commissioning :

During commissioning, the valves do not need major attention, however following points must be kept in mind.

The port ‘A’ should be connected to pressure side, port ‘B’ to tank, pilot pressure to port ‘X’ and remote signal to port ‘P’.

Cap screws and corresponding tightening torque should be as per the data sheet.

Maintenance :

The Pressure Relief Cum Unloading Valves do not need any major attention, however it is necessary to keep following points in mind.

The oil must be of prime quality and clean as per ISO 16/13 and must be changed periodically. Contaminated oil may lead to the wear of the pilot piston thereby increasing the clearance this results in improper working of the valve.

The working temperature should be in the range of –20 to +70 degree Celsius.

 

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 .