Midland A-207 Installation instructions

A-207 Re-Assembly Instruction Supplement, Ver. 0.0
Issue Date: April 27, 2020
Page 1 of 4
A-207 Re-Assembly Instruction Supplement
1Preparation
These instructions are specific to the reassembly of the A-207 Vacuum Relief Valves. For
more maintenance and installation instructions, please refer to Midland’s Installation,
Operation and Maintenance Instructions for A-205/A-222 Vacuum Relief Valves.
•Exercise normal safety precautions for the commodity involved.
•Discard all soft parts being replaced.
2Valve Details
ITEM
NO.
QTY.
PART NAME
MATERIAL
PART NO.
VACUUM
SETTING
(PSI)
SPRING
PART
NUMBER
1
1
BODY
STAINLESS STEEL (PASSIVATED)
207-11-SS-PA
0.75
207-2-MO
2
1
SPRING
STAINLESS STEEL
SEE TABLE
3
207-21-MO
3
1
SPRING SEAT
STAINLESS STEEL
207-3-SS
4
1
LOCK NUT
STAINLESS STEEL
207-41-SS
5
1
STEM
STAINLESS STEEL (PASSIVATED)
207-52-MO-PA
6
1
PRESSURE SEAL
WHITE NEOPRENE *
205-6-WNE
7
1
SCREEN
ASSEMBLY
STAINLESS STEEL
207-7-SS
8
1
RETAINER RING
STAINLESS STEEL
207-8-SS
9
1
NAMEPLATE
STAINLESS STEEL
207-90-SS
10
2
DRIVE SCREW
STAINLESS STEEL
763-11-SS
* Alternate materials available

A-207 Re-Assembly Instruction Supplement, Ver. 0.0
Issue Date: April 27, 2020
Page 2 of 4
3Re-Assembly Procedure
Put approved lubricant in
the quad-ring grooves on
the stem (item 5).
If the side of the quad-ring
(item 6) with a blue dot can
be identified, put that side
down away from the stem.
Figures 1-2
Slip the quad-ring (item 6)
over the stem (item 5) and
into the quad-ring groove,
making sure the quad-ring
is flat in the groove.
Figures 3-4
Run a steel rule around the groove of the quad-ring to
make sure the back side of the quad-ring is well seated
Run a steel rule under the lower side of the quad-ring
to make sure the back side of the quad-ring is well
seated.
Figure 5

A-207 Re-Assembly Instruction Supplement, Ver. 0.0
Issue Date: April 27, 2020
Page 3 of 4
Put the stem (item 5) in
place.
Put the body (item 1) in
place.
Figures 6-7
Place spring (item 2) and
follower (item 3) on the
stem (item 5) so they end
up about level with the top
of the stem to get the
desired pressure setting.
Put the follower (item 3) in
first, then press it down
slightly. Drive the nut (item
4) down by hand as far as it
can go. Figures 8-9
For A-207 valves without a
hole in the screen, install
the screen (item 7) on top of
valve as shown.
Insert retainer ring (item 8)
in groove as shown.
Figures 10-11

© Copyright 2016, OPW. Printed in USA.
© 2016 Delaware Capital Formation, Inc. All Rights Reserved.