Valves work when the water pressure changes. When there is a drop in pressure the valve closes and when the pressure increases it opens. Values can be hydraulic, electric or both.
http://answers.ask.com/Business/Other/how_do_valves_wor...
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A valve uses a mechanism to stop the flow of fluid, gas or air into a chamber. The valve is sometimes the main unit that regulates the amount of liquid or fluid that moves from one chamber to another, or throughout an entire system of pipes...
http://www.ehow.com/how-does_4898414_valves-work.html
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Valves are used to control the flow of water in a system. Valves, used to control the flow of water in a system, can be mechanical, hydraulic, electric or a hybrid. In order for a valve to work, there has to be a drop in pressure between th...
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Inventions question: How do rotary valves work? Rotary Valves A rotary valve, at the ones I'm familiar with, is typically used to move solid materials from a hopper. Basically the valve is designed with ... I know how trumpet rotary valves work. Just tilt the trumpet sideways so the rotary valves face upwards and play.
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wiki.answers.com/Q/How_do_rotary_valves_work
wiki.answers.com/Q/How_do_rotary_valves_work
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How-To question: How does a 4 way hydraulic valve work? Hydraulic 4 way valve basics 4 Way hydraulic valves are often used with double acting cylinders. The valve usually has a handle that is used to ... How work hydraulic gear? Diagram of hydraulic valve? How does hydraulic valves work? What is a hydraulic servo valve?
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wiki.answers.com/Q/How_does_a_4_way_hydraulic_valve_wor...
wiki.answers.com/Q/How_does_a_4_way_hydraulic_valve_work
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A gate valve usually requires more turns - more work - to open it fully. Also, unlike many globe valves, the volume of flow through the valve is not in direct relation to number of turns of handwheel.
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water.me.vccs.edu/courses/CIV240/basic_gate.htm
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Leak checking for valves ... Greater than class VI leakage valves? ... Valves for high-pressure instrumentation...
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www.valvedirectory.com/link.html
www.valvedirectory.com/link.html
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In this article, we will learn how the master cylinder and combination valve work. If you haven't read about basic car braking concepts in How Brakes Work, be sure to check it out ... Introduction to How Master Cylinders and Combination Valves Work...
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auto.howstuffworks.com/auto-parts/brakes/brake-types/ma...
auto.howstuffworks.com/auto-parts/brakes/brake-types/master-brake.htm
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If you have read How Disc Brakes Works and How Drum Brakes Work, you know that the disc brake pad is normally in contact with the ... For more information on master cylinders and combination valves and related topics, check out the links on the next page. ... Introduction to How Master Cylinders and Combination Valves Work...
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auto.howstuffworks.com/auto-parts/brakes/brake-types/ma...
auto.howstuffworks.com/auto-parts/brakes/brake-types/master-brake2.htm
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