Why Use Hamer Line Blind Valves?
Benefits Chart Selection
Chart
Where blinding is a frequent requirement and safety is of primary
concern.
 |
Positive,
permanent shutoff
When the blank end of the spectacle
plate is clamped in position, product cannon leak to the downstream
side of the line. |
|
Visible shutoff
The reverse end of the spectacle plate
is visible outside the valve body, providing a positive visual
indication of its open or closed position. |
|
Fast, one person
operation
Only one person is needed to operate
most Hamer Line Blind Valves. Blinding takes only a few
minutes with an operating bar and substantially reduces operating
time and cost. Other methods generally take two to four
pipefitters (depending on pipe size) 30 to 45 minutes for blinding a
line. |
|
Complete range
The widest range of line blind valves
is available for varied applications and includes models with
enclosed spectacle plate chambers to prevent spillage in case the
line was not totally drained when the spectacle plate is reversed. |
|
Long service
life
Experience proves it. Hamer Line Blind Valves provide long,
trouble-free service.
|
|
Benefits Chart
|
Blinding Technique |
Completely
Leak-Free |
Absolute
Shutoff |
Constant
visible proof of Closed/Open Position |
Five
minutes or less to Operate (Typical) |
Requires
Only One Person to Operate |
Special
Tools to Operate |
Comments |
| Hamer Line Blind Valves |
Yes |
Yes |
Yes |
Yes |
Yes |
No |
See Selection
Chart |
| Blank Flanges and Spools |
Yes |
Yes |
Marginal |
No |
No |
Yes |
Same time and labor
problems as solid plate, compounded by size and weight of spool |
| Standard Valves |
No |
No |
No |
Yes |
Yes |
No |
Nature of valve design does not give
complete assurance of absolute seal, nor provide fail-proof visible
indication of closed/open position. |
| Double Block and Bleed |
No |
No |
Marginal |
Marginal |
Yes |
No |
Expensive. Obstructed
bleed valve can give false indication of shutoff. |
| Solid Plate between Flanges |
Yes |
Yes |
Marginal |
No |
No |
Yes |
Operation typically requires at least
three pipefitters 5 to 6 times as long as line blind valves. |
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| Product
Group |
Valve Type |
Size Range (in.) |
Comments |
| Line spread, fluid loss |
(BW) 3,5,7 & 9 Bold |
1 to 36 |
Most economical means of
blinding fast, where minimum fluid spill is acceptable |
| Non spread, fluid loss |
(SG)
Sliding Gate |
2 to 20 |
Fast
pneumatic operation is standard. Can be remotely controlled. |
| Non spread, non spill |
(VW) Visible Wedge |
2 to 16 |
Use in rigid lines.
Wedge-type spectacle plate assembly allows rapid changeover. |
| Line spread, non spill |
(3F) Fluid
Saver |
1½ to 8 |
Recommend
where frequent blinding is required, and spillage is to be kept to a
minimum. |
| (FS) Fluid Saver |
1 to 4 |
Use as a fluid saver valve,
with particular advantages in "tight accessibility areas" |
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