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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.




Line Blind Valve Selection Chart

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 1 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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