97
A
B
B
A
B
A
A.0500.251 – IM-TL/13.00 EN (08/2009)
Fig 3:
Safety relief valve -
Spring loaded completely opened
Fig. 3 is showing the design of the
spring loaded safety relief valve com
-
pletely opened.
The medium pressure inside the rotor
case has forced the valve head (A)
completely to the left against the
force of the spring.
12.2.2 Safety relief valve - Spring Loaded
12.2.2.1 Spring Loaded
Fig. 1 and 2 are showing the design of the spring loaded safety relief valve. The valve
head (A) is subjected to the fluid pressure in the rotor case on one side and by spring
force on the other side. The spring is acting directly on the valve head.
By turning the spring adjusting screw (B) the compression of the spring is modified and
the opening pressure of the safety relief valve can be adjusted.
To turn the spring adjusting screw (B), the retainer tool delivered with the pump must be
used.
Fig. 1 shows the safety relief valve
completely closed. The valve head
(A) is in line with the front face of
the pump cover. The valve has been
adjusted by compressing the spring via
the spring adjusting screw (B).
Fig 1:
Safety relief valve –
Spring loaded completely closed
Fig. 2 shows the valve partly opened.
The medium pressure inside the rotor
case has forced the valve head (A) to
the left against the force of the spring.
Fig 2:
Safety relief valve –
Spring loaded partly opened
12.2.2.2 Spring loaded completely opened