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EPDT-023c
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3. Operation
Fig. 4
*
The parts shape differs according to the nominal size.
If the adjusting screw [15] is turned right, the diaphragm [11] will be depressed with the adjusting
spring [14] and valve disc [9] connected with spindle [6] will close. (a)
Fluid passes along a conductor pipe [15]
and the sensing chamber under the diaphragm [11]. If the
pressure of the sensing chamber becomes higher than setting pressure, the load of the diaphragm
[11]
bottom will overcome the load of the adjusting spring [14]
,
will push up the valve [9], and will
relieve excessive pressure. (b)
If the pressure of the sensing chamber falls below setting pressure, the valve [9] will be again closed
by the load of the adjusting spring [14].
Sensing
chamber
Detail
view
