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# What is the difference between a single check valve and a double one and can you fit one in the hot water pipe to a shower to prevent cross flow.?

Answer A double check valve is merely two single check valves in close series. This means that under negative pressure the water that momentarily bypasses …the first check valve and causes it to close is stopped from going any further by the second stop valve which will close at exactly the same time (assuming no air or dirt in the valve and pipe). A single check valve stops backflow, but miniscule amounts of "contaminated" water will have passed back along the pipe before it closes. In theory two single check valves in series anywhere along a pressure pipe will act jointly as a double check valve, but the farther they are apart the more likely it is that something will act to stop them doing so. Possibly the shower maker has found it easier to adapt a design by using single check valves either side of the mixer instead of a DVC elsewhere, perhaps on the grounds of length of a DCV fitting. Because of the typical design of both types of check valve they can restrict forward flow rates noticeably, and you should only have them if you really need them. Now, the reason that double check valves are is there is purely to stop pollution of the mains - not your domestic cold water supply, and as such it is a complete con - the water network is raddled and full of cracks leaks and miscellaneous holes, from which about 20% of the water put into supply escapes. Therefore negative mains pressure (eg caused by a burst pipe downhill of you, or the fire brigade pumping water faster then the main can supply) will permit dirty groundwater to infitrate the mains pipe - possibly including road run-off, contaminated groundwater from industrial activities, or sewer leakage. The idea that public health is threatened by your shower dangling in the bath is cobblers, and as such you shouldn't be overly concerned about the arrangements, unless you really feel the need to comply with every detail of the Water Regs.

# 'What is the constant force Nm of water flowing through a 20 mm pipe at 1 liter per second and does the force double if the flow is doubled'?

IT means that you arestupid

# One inch diameter pipe with sixty PSI reading you would like to know what your water flow rate will be?

Well this is a very poor question as one would have to know the kind of piping material as there is friction losses to consider (Hazen Williams formula and Boyle's law)… then one should consider head loss if this is a vertical piping and finally are there other restrictions such as valves/ ells and or valves that are not full port such as globe pattern

# What is the maximum flow rate of a two inches in diameter of a pipe in cubic meter per hour?

What is the maximum flow rate of a two inches in diameter of a pipe in cubic meter per hour?Â Â Â Â Â Improve / capitalOneround('alternateMsg'); …

# What is the water flow rate in a 24 inch diameter pipe in gallons per minute when the flow velocity is 3 feet per second?

what is the discharge flow of 10m/s passing from 2ft pipe

# What is optimum flow rate for laminar flow in water pipe?

Less then 8 FPS (depending on the material ) See Hazen - Williams

# How do you determine flow rate by pipe size?

By knowing the availabe pressure and the diameter / material of the piping

# How do you figure flow rate in piping?

PSI /diameter /

# How do you calculate flow rate in a pipe?

Q = V*A Q is flow rate V is fluid velocity A is x-sectional Area

# How do you calculate pipe diameter given flow rate and pressure?

The simplest way to calculate the pipe diameter would be using flow rate & velocity in the formula, diameter=root((4*Flow)/(Pi*Velocity)). In order to find the velocity from… pressure we can use the formula Velocity=root(Pressure/1000).

# Do the length of pipe effect the flow rate of water?

Stepping down the size of the pipe into a smaller one in fact WILL NOT GIVE MORE PRESSURE! The smaller the size of the pipe, the less water it can carry, and ultimatley di…stribute. So when you have multiple sprinkler heads, the feed lines are usually ran in 3/4 and the branch lines stepped down. Also the same with household cold water is always roughed in in 3/4 and stubbed out in 1/2. That's also why the city has a huge main feed and your house has only usually a 1"

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In Technology

# How can you calculate water velocity from flow rate or diameter of pipe?

Flow Rate Q= VA or V=Q/A. where q=flow rate, V= velocity, A=area.

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In Plumbing

# What is the flow rate of water through a 20 inch pipe at 2500 psi?

For laminar flow? For a full pipe? for a 3/4-full pipe? For a 1/2-full pipe? It all makes quite a difference. Please repost your question with a little more information. It wo…uld also help to for us to know the coefficient of friction of the inside of the pipe.

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In Plumbing

# Is the flow of water flowing at 2 meter per second through 3 inch diameter GI pipe laminar or turbulant?

Calculate the Reynold's number. As a rule of thumb, any Reynold's number < 2000 is considered laminar, 2000…

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In Plumbing

# What is the rate of water flow through a 100mm diameter pipe with 300mm head pressure?

300mm is a very low head, you can't expect much flow through that pipe, but you can work it out from the mechanical energy balance equation.

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In Technology

# What is flow rate for copper pipe?

This question is literally impossible to answer correctly because there is no given size or pressure of the liquid or gas travelling through it.