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Is the pressure drop through a globe valve less than through a gate valve?
Wiki User
∙ 13y ago
HECK NO the globe pattern offers the most pressure drop because of friction losses
Wiki User
∙ 13y ago
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Which valve is prefered to use for ammonia tanks a globe valve or a gate valve?
If the purpose of the valve is to modulate flow, a globe valve is preferable. If the valve is only on-off, a gate valve is preferable because of lower pressure drop when the valve is open. As wikipedia , A globe valve is a type of valve used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body. So i think it is a globe valve to use in steam pipeline.
Y pattern globe valve advantages over T pattern?
Y pattern globe valves allow probably less pressure drop as compared against the T pattern globe valves. I do not have experimentally proven results for this. However the flow pattern in Y Globe valve is more "linear" while that T pattern is more "zigzag". Secondly, height of the valve from its flow bores' center line till top of the hand wheel is less in Y Globe Valves, as compared against the T Globe Valves. This gives compactness to Y Globe Valves - which is beneficial in pipings where space is a constraint. [by Ganesh Devale, Pune - India]
Where to use reduced bore and full bore?
Use full bore for applications where pressure drop should be minimum (such as in the suction pipe of a pump with required NPSH very close to available NPSH), or for pipes which could be cleaned with a pig (so that the pig doesn't get stuck on the valve). In other applications a reduced bore should be OK.
When would a gate valve be preferred to a ball valve?
Gate Valve is * Well sealed * Causes a low pressure drop * Don`t Cause hammering * serve Wide size Range * Wide range of temperature * Wide range of temperature Ball Valve is * Limited in usage for Temperature cautions * Needs a big Operating Torque for big Sizes
Why are direct acting relief valves not used on high pressure and high flow hydraulic systems?
As a direct relief valve opens, its spool or poppet pushes against a spring. As the spring compresses, the system pressure necessarily rises due to the spring constant. To handle large flows, you need a big valve. To minimize the pressure rise due to the spring constant you need a long spring. To minimize the pressure drop due to the valve body, you need a big valve body, which in turn needs a bigger spring. As the operating pressure goes up, you need stiffer (typically bigger)springs. Eventually the cost of the valve is prohibitive and a pilot operated valve is called for. There are benefits to using direct operated valves which may out weigh the costs, but most direct operated valves are limited to medium and low pressure settings.
What is the Pressure drop in glove valve?
You mean GLOBE valve and that would depend on the size of the valve and the maker
If a valve creates a back pressure of 1.5 to 2 bar on a pump what will be the pressure of liquid flowing through the tube on other side?
Valves, like other discontinuities, cause a drop in pressure as fluids flow through. The more fluid goes through the valve, the higher the fluid velocities within the valve will be, and the greater the pressure drop. If you are seeing 1.5 to 2 bar drop through the valve, the pressure at the outlet will be 1.5 - 2 bar lower than the pressure at the inlet. If you know the characteristics of the valve, you can figure the pressure drop at any given flow rate, but you need to know the pressure at either the inlet or the outlet to find the pressure at the other end.
Which valve is prefered to use for ammonia tanks a globe valve or a gate valve?
If the purpose of the valve is to modulate flow, a globe valve is preferable. If the valve is only on-off, a gate valve is preferable because of lower pressure drop when the valve is open. As wikipedia , A globe valve is a type of valve used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body. So i think it is a globe valve to use in steam pipeline.
Why is the pressure drop higher in globe valves than in gate valves?
The flowpath in gate valves is sraight. In a globe valve, the flow has to make at least one 90° angle (for some angle body valves) and usually more. Changing the direction of the flow causes pressure drop. Also, the minimum flow area of a gate valve is usually greater than the same size globe valve, making it more efficient. Energy in the flow is lost in expansions and contractions, and the loss of energy manifests itself as pressure drop. The fewer expansions, contractions, direction changes, and general disruptions of any kind in the flow, the lower the measureable pressure drop will be.
What is Equivalent length of pipe?
Equivalent length of a pipe is a term applied to express the pressure drop generated by valves and fitting in a pipe. In literature, you usually find ratios of equivalent length to diameter of the pipe. For example, L/D for a fully opened globe valve is 300. This means that, if you have a fully opened globe valve in a pipe and the internal diameter of the pipe is ID=0.05m, then the equivalent length for this globe valve =300*D=300*(0.05m)=15m. Equivalent length of 15 meters means that the globe valve generates the same pressure drop as as straight 15-meter long pipe.
Why the energy losses in globe valve due to the fully open valve is greater than losses of gate valve?
Globe valves have a more complex flow path, involving multiple changes in direction, which results in higher energy losses when fully open compared to gate valves that have a straight-through flow path. This increased resistance in globe valves leads to higher pressure drop and energy losses in the system.
How does a valve cause a pressure drop in terms of the individual molecules in the liquid?
Soo
Y pattern globe valve advantages over T pattern?
Y pattern globe valves allow probably less pressure drop as compared against the T pattern globe valves. I do not have experimentally proven results for this. However the flow pattern in Y Globe valve is more "linear" while that T pattern is more "zigzag". Secondly, height of the valve from its flow bores' center line till top of the hand wheel is less in Y Globe Valves, as compared against the T Globe Valves. This gives compactness to Y Globe Valves - which is beneficial in pipings where space is a constraint. [by Ganesh Devale, Pune - India]
How much drop should a gas valve when it comes on?
Most all manufacturers of gas valves have a pressure drop of one inch wg
Why does pressure drop when transmitted through a tube of grease but not through a tube of oil?
There will be a pressure drop in both. But there will be more of a pressure drop in a grease tube due to the density of the fluid. If you look at the darcy-weisbach equation density is on the top, therefore the more dense the fluid is the more change in pressure there will be.
If you have a bent valve will your oil pressure drop also is it drivable for about ten miles it's a VG30E V6?
I'm not sure the oil pressure would drop with a bent valve. I wouldn't drive it at all but if your driving to shop or home and don't want to pay to have it towed, drive real slow.
How do you define the coefficient of incipient cavitation?
The cavitaion index across a valve or pipe fitting is defined as the ratio of difference between upstream pressure and vapor pressure to the pressure drop across the valve or fitting. The index at which incipient cavitation, damage, or choked flow occurs is based on testing and depends on the type of valve or fitting.
