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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 else can I help you with?
Does pressure drop when blood moves from arteries to veins?
Yes. Blood always flows from a higher pressure to a lower pressure, so as the blood moves from the arteries through the capillaries and into the veins pressure drops considerably.
What is carotid baroreflexes?
There are receptors on the lining of the carotid artery that sense a change in blood pressure. When they are stimulated, they can cause a drop in blood pressure/heart rate.
Why do your knees hurt when it rains?
Studies have pointed to changes in barometric pressure as the culprit. The drop in pressure allows the body tissues to expand which puts more pressure on nerves that control pain signals.
Why doesn't the blood pressure within the arteries drop to zero?
The circulatory system is a closed system, it shouldn't be zero anywhere.
Can slow down the heart rate when taking a rectal temp?
Yes, while taking rectal temp, pressure may be applied on the vagus nerve. This could drop both heart rate and blood pressure
If globe valve is installed in reverse direction is there any change in pressure drop?
Yes, if a globe valve is installed in the reverse direction, there can be a change in pressure drop across the valve. Globe valves are designed to control flow in a specific direction, and reversing them can lead to increased turbulence and flow resistance. This may result in a higher pressure drop compared to correct installation, potentially affecting system performance. Additionally, it may cause operational issues such as improper sealing and increased wear.
Why the energy losses in globe valve due to the fully open valve is greater than losses of gate valve?
Simple globe valves are not positive shut of and are used strictly for throttling thus they have a very high friction loss=Gate valves are either fully open of fully closed NORMALLY FULL PORT OPENING=
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]
Is the pressure drop through a globe valve less than through a gate valve?
HECK NO the globe pattern offers the most pressure drop because of friction losses
Why pressure drop occur even there was no leakage in hydrostatic test?
Isolating valves may have passing.
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
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
Why is it that the higher you drop a ball the higher it bounces?
Because there is more pressure pushing onto it
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.
What is the relationship between the flow rate and the pressure drop across a pipe?
The relationship between flow rate and pressure drop across a pipe is that as the flow rate increases, the pressure drop also increases. This means that a higher flow rate will result in a greater pressure drop in the pipe.
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.
What Difference between the dry and wet column pressure drop at fixed flow conditions?
The dry column pressure drop refers to the pressure drop across the column when no liquid is present, while the wet column pressure drop refers to the pressure drop when the column is flooded with liquid. The wet column pressure drop is typically higher than the dry column pressure drop at fixed flow conditions because the presence of the liquid adds additional resistance to flow, increasing pressure drop.
