Midland A-207 Instructions d'installation

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

BODY

STAINLESS STEEL (PASSIVATED)

207-11-SS-PA

0.75

207-2-MO

SPRING

STAINLESS STEEL

SEE TABLE

207-21-MO

SPRING SEAT

STAINLESS STEEL

207-3-SS

LOCK NUT

STAINLESS STEEL

207-41-SS

STEM

STAINLESS STEEL (PASSIVATED)

207-52-MO-PA

PRESSURE SEAL

WHITE NEOPRENE *

205-6-WNE

SCREEN

ASSEMBLY

STAINLESS STEEL

207-7-SS

RETAINER RING

STAINLESS STEEL

207-8-SS

NAMEPLATE

STAINLESS STEEL

207-90-SS

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

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