4.2. PROCEDURE for Replacement of Seat, Dome and Spring Assembly
3) Depress the dome manually to check for freedom of movement
4) Position the resilient seat in the yoke groove, with the dome
seat downwards.
5) Carefully place the resilient seat and yoke over the dome, ensuring alignment
of the bolt holes, checking the seat is sitting central.
6) If the hydrant is in the work shop and you have provisions of a press, compress
the the dome down without damaging the spring, enough to fit the nuts.
Otherwise insert the bolts and place the washer and nut on with two threads each
side, pushing down on the dome.
Note The nut shall be installed upside down.
This is an Australian Standard requirement
9)
Check to make sure that the resilient seat is sitting centrally. If the seat is not
sitting centrally depress plunger again loosen off bolts, reposition seat and
re-tighten.
7
) Tighten the nuts ensuring the yoke is compressing evenly
8
) Tighten the bolts evenly to 60nm using a torque wrench maintaining an even space
between the matting flanges on both sides
10) When satisfied the seat and dome are correctly installed, depress the dome twice
and check for freedom of movement and alignment.
11) Check final bolt torques
SERIES 30 HYDRANT
INSTALLATION, OPERATION & MAINTENANCE MANUAL
12) The valve is ready to be pressure tested
Diagram (a) 30/10 series swab insert
1
a
)
Swab version 30/10 has a removable insert to support the spring
and dome. Ensure this is inserted first and centrally located in recess.
(See diagram (a) below)
1) Insert the dome pin inside the spring with the dome head going over the
spring.
2) Insert the spring and dome into the body of the hydrant with the spring going
over the spindle guide and the stem through the guide.
AVK Australia Holdings Pty Ltd - 559A Grand Junction Road, Wingfield, SA 5013, Australia - Tel: +61 8 8368 0900 - Email: enquires@avkau.com.au - www.avkcivil.com.au Version number 2
COPYRIGHT©AVK GROUP A/S 2017 Pg 7
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