IM No. : IM/V/0021, Rev. 2
Date: 06.11.2017
Page 1 of 6
MOUNTING, OPERATING, TESTING & MAINTENANCE INSTRUCTIONS
FOR ROTEX 5/2, 3/2 CONVERTIBLE NAMUR SOLENOID VALVE
MODEL 51424, 51424LW, 51424IS
ROTEX
retains all rights to this publication.
All details within this manual and the catalogue are subject to change without manner.
ROTEX
will not be responsible for any damage whatsoever arising from the use of the Solenoid Valve, due to misuse or
incorrect installation or misinterpretation of the information contained herein.
SPECIFICATION OF STANDARD SOLENOID VALVE
CONNECTION
VALVE TYPE
Inlet
Outlet
Exhaust
Outlet
Exhaust
Pilot Vent
External
Pilot Inlet
51424
1
2 (NAMUR)
3
4 (NAMUR)
5
6
-
A)
OPERATING PRINCIPLE
On de-energized condition of the solenoid, pressure applied at the inlet port, a part of media from the inlet port # 1 is drawn
through the internal pilot passage which is blocked under Plunger. In case of External Pilot Operated Valve the external
pilot port # 7 is drawn through the external pilot passage is blocked by plunger. In this state the Inlet port # 1 & Outlet port
# 4 is connected. Outlet port # 2 & Exhaust port # 3 are connected; Exhaust Port # 5 is blocked.
On energized condition of the solenoid, Plunger moves up and media from pilot passage acts on the piston assembly thus,
poppet assembly goes down and connecting. In this state Inlet port # 1 & Outlet port # 2 is connected. Outlet Port # 4 &
Exhaust port # 5 are connected; Exhaust port # 3 is blocked.
NOTE: IN CASE WHEN THE VALVE IS OPERATED AS EXTERNAL PILOT OPERATED VALVE, THE PILOT AIR
PRESSURE SHOULD BE MINIMUM 2 bar OR > MAIN FLUID PRESSURE WHICHEVER IS HIGHER.
