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API 6D Gate Valve Selection - Slab vs Expanding
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API 6D Gate Valve Selection - Slab vs Expanding
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API 6D Gate Valve Selection - Slab vs Expanding
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API 6D Gate Valve Selection - Slab vs Expanding
API 6D Gate Valve Selection - Slab vs Expanding
Gorman3(Industrial)
Liners | ChemValveGet Your One-Piece Ball Valve Today!(OP)
13 Nov 14 15:02
In a situation where the valve size, class and trim are the same why would I choose an expanding over a slab. Not talking about metal seated. when would you use a 600# expanding gate over a 600# slab gate, let's say both were PEEK seated for high temp.
I have assumed the expanding gate's mechanical seal would be well suited for gas applications when there line pressure fluctuates. Is that right?
Any other info appreciated.
RE: API 6D Gate Valve Selection - Slab vs Expanding
ricklts(Mechanical)
14 Nov 14 14:39
Gorman3
Expanding gates will give you, at least are supposed to, 1. an upstream seal against line pressure, and 2. reduced operating torques at full pressure differential when opening.
Rick
RE: API 6D Gate Valve Selection - Slab vs Expanding
LittleInch(Petroleum)
18 Nov 14 11:48
As the seating force is not affected by the fluid pressure then any application where line pressure is not high would be a good use.
Places where you have isolation for entry - things like pig traps - and you would like really good isolation over a long period of time / usage like station isolation valves are where you might go the extra mile in terms of cost and size to install an expanding gate.
As with DPE seated ball valves you need to allow for liquid expansion in the cavity if exposed to solar effect or other heat input for an
expanding gate valveexpanding gate valve.
You would choose an expanding gate valve when you need true double isolation and possible bleed as well in a single valve. The sealing o the upstream seta is by means of the mechanical action closing the valve, not the fluid pressure. They also claim to be more resistant to particle wear as the seats pull away before sliding up inside the valve. As ricklts says, because the slab often disengages and is then held off the seats, the opening torque can be reduced.As the seating force is not affected by the fluid pressure then any application where line pressure is not high would be a good use.Places where you have isolation for entry - things like pig traps - and you would like really good isolation over a long period of time / usage like station isolation valves are where you might go the extra mile in terms of cost and size to install an expanding gate.As with DPE seated ball valves you need to allow for liquid expansion in the cavity if exposed to solar effect or other heat input for an expanding gate valve.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: API 6D Gate Valve Selection - Slab vs Expanding
Gorman3(Industrial)
(OP)
18 Nov 14 23:56
Than both of you. This is just the kind if answer I was looking for.
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News
WKM Pow-R-Seal Expanding Gate Valve
60 years of worldwide service in oil, gas, chemicals, water, slurry, and multiproduct applications has established the Pow-R-Seal double expanding gate valve as one of the most trusted gate valves, especially where safety and seal reliability are critical.
The positive, mechanical seating force of the lock-in-place seals holds with zero leakage through conditions of vibration, pressure change, and temperature excursion. The rigid, cast steel body resists pipeline bending moments.
TFE seals on both faces of the valve provide drop-tight sealing even at low differential pressure, while metal-to-metal contact between the seals and gate mechanism provides fire-safe shutoff. Optional all-metal seals also are available for service up to 1,000 degF [538 degC], where leakage rates comply with API Spec 6D, Supplement 2.
Our Pow-R-Seal gate valve is the choice of liquid pipeline operators because it tolerates the wax, paraffin, abrasives, and multiproduct flow that causes problems in other valve designs.
The gate valve provides these specific advantages resulting in reliable performance and long life:
- Protection of seat faces
- Smooth, continuous conduit for flow
- Tight mechanical seal and double block-and-bleed capability
- Fugitive emissions-tested SLS spring-loaded lip seal
- In-line, field repairable
- Certified fire-safe to API Spec 6FA, BS 6755, and ISO 10497
- Selected for corrosive, erosive, and aggressive pipeline service
API 6D Gate Valve Selection - Slab vs Expanding
API 6D Gate Valve Selection - Slab vs Expanding
Gorman3(Industrial)
(OP)
13 Nov 14 15:02
In a situation where the valve size, class and trim are the same why would I choose an expanding over a slab. Not talking about metal seated. when would you use a 600# expanding gate over a 600# slab gate, let's say both were PEEK seated for high temp.
I have assumed the expanding gate's mechanical seal would be well suited for gas applications when there line pressure fluctuates. Is that right?
Any other info appreciated.
RE: API 6D Gate Valve Selection - Slab vs Expanding
ricklts(Mechanical)
14 Nov 14 14:39
Gorman3
Expanding gates will give you, at least are supposed to, 1. an upstream seal against line pressure, and 2. reduced operating torques at full pressure differential when opening.
Rick
RE: API 6D Gate Valve Selection - Slab vs Expanding
LittleInch(Petroleum)
18 Nov 14 11:48
As the seating force is not affected by the fluid pressure then any application where line pressure is not high would be a good use.
Places where you have isolation for entry - things like pig traps - and you would like really good isolation over a long period of time / usage like station isolation valves are where you might go the extra mile in terms of cost and size to install an expanding gate.
As with DPE seated ball valves you need to allow for liquid expansion in the cavity if exposed to solar effect or other heat input for an expanding gate valve.
You would choose an expanding gate valve when you need true double isolation and possible bleed as well in a single valve. The sealing o the upstream seta is by means of the mechanical action closing the valve, not the fluid pressure. They also claim to be more resistant to particle wear as the seats pull away before sliding up inside the valve. As ricklts says, because the slab often disengages and is then held off the seats, the opening torque can be reduced.As the seating force is not affected by the fluid pressure then any application where line pressure is not high would be a good use.Places where you have isolation for entry - things like pig traps - and you would like really good isolation over a long period of time / usage like station isolation valves are where you might go the extra mile in terms of cost and size to install an expanding gate.As with DPE seated ball valves you need to allow for liquid expansion in the cavity if exposed to solar effect or other heat input for an expanding gate valve.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: API 6D Gate Valve Selection - Slab vs Expanding
Gorman3(Industrial)
(OP)
18 Nov 14 23:56
Than both of you. This is just the kind if answer I was looking for.
Red Flag This Post
Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.
Red Flag Submitted
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The Eng-Tips staff will check this out and take appropriate action.
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News
60 years of worldwide service in oil, gas, chemicals, water, slurry, and multiproduct applications has established the Pow-R-Seal double expanding gate valve as one of the most trusted gate valves, especially where safety and seal reliability are critical.
The positive, mechanical seating force of the lock-in-place seals holds with zero leakage through conditions of vibration, pressure change, and temperature excursion. The rigid, cast steel body resists pipeline bending moments.
TFE seals on both faces of the valve provide drop-tight sealing even at low differential pressure, while metal-to-metal contact between the seals and gate mechanism provides fire-safe shutoff. Optional all-metal seals also are available for service up to 1,000 degF [538 degC], where leakage rates comply with API Spec 6D, Supplement 2.
Our Pow-R-Seal gate valve is the choice of liquid pipeline operators because it tolerates the wax, paraffin, abrasives, and multiproduct flow that causes problems in other valve designs.
The gate valve provides these specific advantages resulting in reliable performance and long life:
If you want to learn more, please visit our website api gate valve.
- Protection of seat faces
- Smooth, continuous conduit for flow
- Tight mechanical seal and double block-and-bleed capability
- Fugitive emissions-tested SLS spring-loaded lip seal
- In-line, field repairable
- Certified fire-safe to API Spec 6FA, BS 6755, and ISO 10497
- Selected for corrosive, erosive, and aggressive pipeline service
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