ONLINE BLIND VALVE
Risansi Actuator Valves is a unique system and an improvement over conventional paddle blind/ figure eight / hammer blind / spectacle blind It eliminates the need to spread the body flanges.
The fixed 0ring is mounted on the body flanges whereas the other '0' ring is mounted on the seal carrier A single adivator screw perpendicular to the axis of the pipe, when rotated, slides a moveable inclined plane againit a fixed inclined plane, allowing the seal carrier to move axially towards the spectacle plate thus tightening it completely, or away from the speCtacle plate allowing the blind to be thrown / or the speetacle plate to be rotated on the slot The open or closed position of the line is simultaneously indicated and is clearly visible Changing the open/close position of blind is an extremely fait process and can be done within a few minutes.
Risansi Online Blind is an unique system and an improvement over conventional paddle blind / figure eight / hammer blind / spectacle blind. It eliminates the need to spread the body flanges.
The fixed 'O' ring is mounted on the body flanges whereas the other 'O' ring is mounted on the seal carrier. A single activator screw perpendicular to the axis of the pipe, when rotated, slides a moveable inclined plane against a fixed inclined plane, allowing the seal carrier to move axially towards the spectacle plate thus tightening it completely, or away from the spectacle plate allowing the blind to be thrown / or the spectacle plate to be rotated on the slot The open or closed position of the line is simultaneously indicated and is clearly visible.
ONLINE BLINd OPEN
In this picture the green colored spectacle plate is tight. The solid part is seen visually indicating that the pipeline is open and full flow through the line is available.
ONLINE BLIND IN CHANGE POSITION
Once the pipeline has been de-pressurized and drained the hand wheel is rotated giving clearance for the green colored spectacle plate to be rotated. As show in the picture the spectacle plate is between the open and close position.
ONLINE BLIND CLOSED
In this picture the green colored spectacle plate is tight. The part seen visually is hollow indicating that the pipeline is closed and flow through the line is blocked totally.
- Open & Closed positions readily visible
- Spreading of pipe is not required
- Seal protected from accidental mechanical damage
- Seal protected from exposure to sun
- Simple one man operation
- Minimal maintenance
- Positive shutoff of liquids, slurries and gases
- Available in flanged/butt-welded connections
- Production and Refining pipeline
- Gas gathering (including sour gas service)
- CO2/Well injection
- Pulp & Paper
- Food & Beverage
- Cement Plants
- Aboard ships and tankers
- Terminals and storage
Installed in conjunction with an upstream valve, it can be used in the most critical applications
- Aboard oil tankers, ships, loading docks and barge services where cross contamination of cargo or accidental overboard discharge assumes the proportions of a disaster;
- In the chemical and petrochemical plants, refineries and tank storage farms.
- Power houses install them upstream of equipment which requires frequent repairs, Steel mills, cement industry, Sugar Mill, pulp & paper industry all use our blinds.
Advantages of Risansi online blinds over traditional blinds
Blinding Plates or spectacle plates (sometimes called Paddle Blinds or Figure Eight) have been in existence for many years and for good reason they are simple leakproof shutoff.
A binding plate or figure eight instead between two gasketed companion flanges will provide an absolute dead shutoff. But they have maintenance problems. Refer comparison table.
Hammer Blinds have seals mounted on spectacle plate thus exposing them to sun, and accidental mechanical damage.
Due to change in temperature, expansion or contraction result in piping misalignment effecting alignment of spectacle plate and the seal. to spread the body flanges, bolts have to be turned one by one and the operator has to continousely jump over the line; which could be very cumbersome if the line size is very large. While tightening the bolts 'gall' or 'freeze' frequently occurs.
RISANSI ONLINE BLIND is mounted on the pipe, the body flanges need not be spread plus the bolts are of increased diameter and tackwelded, hence the seal is unaffected by piping misalignment.
The seals are mounted inrenally (protecting the from sun and accidental damage) yet they can be replaced ONLINE, the open or closed position of the line is simultaneously indicated and is clearly visible because of which chances of accidents are totally eliminated AN IMPORTANT SAFETY FEATURE.
Comparison of Risansi Online Blinds with Conventional Blinds
|CONVENTONAL BLINDS||RISANSI ONLINE BLINDS|
|The steps required to either Insert, remove, or change a Conventional Blind are:|
|1||Loosen & Remove the bolts & Nuts, which in almost all cases are rusted.||Not Required|
|2||Jack apart the two companition flanges||Not Required|
|3||Remove the gaskets||Not Required|
|4||Insert, Remove or Change the Blind||Just turn the activator screw to throw the blind|
|5||Replace gasket, tighten the bolts and nuts||Not Required|
|6||This whole exercise takes over an hour & minimum two men||Time taken is 5 mintues & Man power required is only one|
|RISANSI ONLINE BLINDS ARE AVAILABLE IN STANDARD SIZES FROM 1" TO 12" HIGHER SIZES UPTO 24" UPON REQUEST|
Standard Material of Construction
|NAME OF PART||PART NO.||QTY.||STANDARD MOC|
|Online Blind Flange 1||2||1||Mild Steel|
|Online Blind Flange 2||2||1||Mild Steel|
|Spectacle Plate||4||1||AISI 304/316|
|Seal Carrier||5||1||AISI 304/316|
|O'Ring for Seal Carrier||6||1||AISI 304/316|
|O'Ring for Flange||7||1||Nltrlle/Vlton|
|Activator Screw Assembly||9||1||Mild Steel|
|Seal Pusher||10||1||Mild Steel|
|Mounting Flange (optional)||11||2||As specified|
|Drain (optional)||12||2||Aisi 304/316|
|Grease Pocket||13||1||Mild Steel|
|Metallic & Rubber Parts are also available in other Materials of Construction.|