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Butterfly valve Vs Sluice valve in Fire Piping system
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(Mechanical)
(OP)
11 Jul 12 10:26All,
Can you please explain, how in fire piping system, butterfly valve and sluice valve differs functionally? To my knowledge, both are functionally same. But some of my colleagues are saying, sluice valve are much safer than butterfly valve. Also in sluice valve we have less friction loss. For cost reduction also, people are suggesting to go for butterfly valve. Except for cost reason, I can't stand my point in Sluice valves. Is safety the only point for going with sluice valve? Please help.
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(Mechanical)
11 Jul 12 18:58Butterfly valves are quite acceptable for such service. Downside is you cannot maintain them in situ as you can a sluice valve. you will find vistaulic do a range of such valves with their patent connections that are part of their fire system of piping.
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(Mechanical)
(OP)
11 Jul 12 23:37Thanks for putting some lighting on the subject. Now apart from safety part of view, maintenance is another point to be considered.
How sluice valve can be maintained in-situ and why can't butterfly valve?
(Mechanical)
11 Jul 12 23:45It has been known for butterfly valves to jam in the open position making them impossible to remove from the pipeline unless there is a dismantling joint nearby. The valve has to be eremoved to maintain the integral seal.A sluice valve will invariably be fully open or closed. The top works can be removed to get tot he plug and seat.One thing that you might consider is that a butterfly valve is not considered to be a form of isolation when it comes to double isolation philosophy. Opening of a butterfly valve can be rapid as smaller vavles are quater turn and larger valves pass 80% of flow when 20% open. Hence waterhammer may be of concern.Another matter to consider is that butterfly valves come in wafer, lugged and flanged tyoe. A wafer type cannot be used for isolation if the downstream piping is removed. this issue does not arise with sluice valves as they are fully flanged.Suggest you start looking at some valve design drawings on the various manufacturers website and you can see the difference in the design.
&#;The beautiful thing about learning is that no one can take it away from you.&#;
---B.B. King
http://waterhammer.hopout.com.au/
(Mechanical)
(OP)
12 Jul 12 00:13That really helps a lot.
Thank u!!
(Mechanical)
18 Jul 12 09:03Hello both!One additional point: by firefighting it seems that you both are talking about 'normal pressure, normal sized firefighting systems', say up to 250 mm (6 inch) size absolutely max and 10 bar max pressure? And 'sluice' as normal soft-seated gatevalves?In this case I fully agree, assuming valves to be selected on long-term quality and references, not on price!You could, however, for critical and isolation valves consider double flanged, double eccentric BFL valves with gears. This will be more dependable and with far longer life, but at considerably higher price. Especially for motor valves, or higher sizes and pressures, this should at least be considered.
(Mechanical)
(OP)
20 Jul 12 06:42Hey gerhardl:
Thanks for the additional info. As you know, we are talking about the fire-fighting system with working pressure maximum of 88 Metre water of column (8.8 bar). However if at all my system undergo such high pressure, I will consider your point surely.
Thanks
(Mechanical)
17 Nov 12 14:58Sluice gate valves, or parallel slide gate valves, also knife gate valves, are the the standard gate valves's older brother, used in larger pipe-diameter applications. Their shut-off is slower than butterfly valves, but their shut off is also more prone to a good seal. You would opt for a sluice gate for safety, and for a butterfly valve for price. If you do decide to go for a butterfly valve, I'd go with gerhardl's suggestion on double flanged, both for life and for safety. That will increase price, so if comparing, compare the sluice gate with a decent butterfly valve, and then decide. Factor in shut-off time in your considerations, if you're looking at a millisecond-critical application.
My focus is on valve stockists in the us and uk who supply duplex and super duplex valves, and inconel and hastelloy valves, plus titanium, alloy 20 and 904L valves.
(Civil/Environmental)
27 Nov 12 20:18If/when you want to run anything other than water through a pipeline (e.g. pipeline pigs for removing debris or anything left or crawling in pipeline, or any sorts of present or future instruments etc.) this will generally be easier when you have full-port opening valves.
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The gate which regulates the sluice is a valve known as the sluice valve. These gates are made to be sealed in one direction and are typically used to regulate water levels and flow in streams and canals. Sluice gate valve can also be used in wastewater treatment plants.
SLUICE VALVE
What Is a Sluice Valve?
A gate valve or a Sluice gate valve is described as a valve that uses a gate or wedge shape disk that slides perpendicular to the flow of the fluid into or out of the pipeline. When the gate valve is fully opened, the disk of the gate valve is completely separated from the flow. This practically gives no opposition to flow. Due to this, very little reduction in pressure is experienced as the fluid moves through the gate valve.
The sluice gate valve is the common type of valve that is used in process plants to handle slurries. In operation, these valves are either fully opened or fully closed.
Sluice gate valves cannot be used for throttling as accuracy cannot be achieved using them. The high flow velocity in the partially open valve can cause disk and seat surface erosion and can also cause vibration and noise.
How Does a Sluice Valve Work?
The sluice gate valve is controlled by a lifting gate or wedge, so that flow of water can move without obstruction. The top end of the stem has a hand-operated wheel or a motor that raises and lowers the doors, and the lower end has a circular or wedge gate to obstruct water flow. It employs a threaded stem, so the valve must turn several times to shift from the open position to the closed position, and vice versa to stop water hammering.
There are mainly two main types of the spindle that are used to raise the gate in a sluice valve.
The dimension of the sluice valve is usually the same as the size of the main valve that is up to a diameter of 300 mm. For larger diameters, the size of the valve is roughly two-thirds the size of the main valves.
The valves are mounted in a valve chamber fitted with caps or handwheels for operation. The method of opening the valve can be clockwise or counter-clockwise, indicated at the outer end of the spindle.
Where Do We Use The Sluice Valve?
Sluice gate valves are commonly used to cut off the liquid flow and cannot be used as a flow regulator. In a completely open position, there is no obstacle in the flow path by the sluice valve, which result in very little flow-resistance. When you move the gate, the size of the open flow path normally varies in a non-linear way. This indicates that the flow rate does not vary with the stem travel uniformly. Depending on the structure, a partially opened gate will vibrate due to the flow of fluid. Sluice valves are often used for larger pipe diameters as they have easy and simple construction than other types of large valves.
At high pressure, friction may become a concern. As the gate is forced against its guide rail by the force of the medium, it becomes more difficult to operate the valve. Large gate valves are often equipped with a bypass that is controlled by a smaller valve so that the pressure can be decreased when the gate valve is operated.
Sluice Valve Installation And Maintenance
Sluice gate valves are very easy to use and are long-lasting when their installation is done in a proper way and the maintenance is carried out in a regular interval.
Installation of Sluice valve.
Maintenance of Sluice valve.
If the valve is not used regularly it is to be operated and maintained once a month to make sure there are no blockages or wear. Before this, make sure the system pressure is relieved and is not pressurised. To remove the gate for inspection, the bonnet and stem are to be removed. After this check, the sluice gate & guide for any damage or wear and refit/replace the parts after the inspection.
Difference Between Gate Valve & Sluice Valve
Sluice valves and gate valves are somewhat different in operation and usage. A gate valve can be a good option for in-line sealing and sludge applications. But when it is needed for managing the flow in a sluice or stream, the sluice gate valve is the best option for your application.
NTGD valve is an experience sluice valve manufacturer, feel free to contact us if you have any question
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