After completing this course, participants should be able to describe how valves control flow rate, flow direction, and pressure in a hydraulic system. Also note that counterbalance valves are restrictive type devices and as such are not ideal for low pres-sure applications, such as those below 750 psi. This course is designed to familiarize participants with the functions performed by various types of valves used in hydraulic systems. While the five types of flow control valves described above are some of the most commonly used valve types, there are other types of flow control valves with features that make them suitable for different applications. Counterbalance valve, classified by type, is an internally-externally piloted valve because both the pilot pressure and the load pressure tend to open the valve. After minor rearrangements, Equation 1 takes the form . Load Holding Motion Control valve - Counterbalance valve VBSO-DE-FC2 05.42.06 - X - Y - Z. Dual, standard configuration; Flangeable; Maximum operating pressure up to 210 bar; Maximum flow up to 140 l/min; Data sheets . Push button. The valve body is available with different port sizes and thread types. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) Load Holding Motion Control valve - Counterbalance valve VBSO-DE-FC2 05.42.06 - X - Y - Z. Pressure adjustment from 1000 to 5000 PSI. A. Here’s a look at a few other types of flow control valves. 2. Counterbalance valves with pilot assist are meant to control an overrunning load. We have already discussed the important types of hydraulic valves. In order to prevent a loaded cylinder from drifting, a poppet-type valve must be used. Additional Technical Data. Learn. In load-holding applications, it can be used as a hose-break valve. Counterbalance Valves. A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.. Ideally the inherent valve characteristic should be chosen to give an installed characteristic as close as possible to linear (see inherent vs installed characteristic). Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. PRESSURE REDUCING AND RELIEVING, DIRECT ACTING SPOOL TYPE COMMON CAVITY VRPR-10A SIZE 10 04.95.04 - X - 85 - Z Rev.0605 Page. Butterfly valve. Counterbalance Valve Poppet Type, Direct-Acting Metric Cartridge – 420 bar RSM12121 Up to 120 l/min Up to 420 bar The counterbalance valve RSM12121 is a direct-acting poppet valve. Uses include controlling over-running loads in cylinders and motors. Each valve is capable of 350 bar (5075 psi) and now available in pre-engineered dual counterbalance HICs. Gate valves; The valve which is used to regulate the water supply or flow in the mains is known as gate valves. Counterbalance valves are available with either poppet- or spool-type pressure control elements. Sort By: Standard Pilot Assisted Load Control Valves. Hydraulic Valves & Accessories This page is part of a complete catalog which contains technical and safety data that must be reviewed when selecting a product Take practice test of each chapter 3. Standard poppet type differential area ; Special cavity, Sun T-11A; Maximum operating pressure 350 bar; Maximum flow 60 l/min; Data sheets. If primary pressure exceeds the pressure setting, fluid is released to keep the pressure constant. Counterbalance valve VBSN-08U-TF 04.52.37 - X - 20 - Z. Counterbalance valve VBSN-08U-TF 04.52.37 - X - 20 - Z. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. 1-2 How counterbalance valves work. Two compressors should not be run in parallel because A. Subject to change, status 2020-06-24 17:31:16 . #0 Spool – Same as Above – All Ports Relieved in Center Position. Used to control the operating sequence of two or more actuators. Counterbalance valves are also used to prevent a loaded cylinder from falling, but their operation is smoother than a pilot-operated check valve. counterbalance valves causes the effective setting to be increased by a factor of 1 + pilot ratio x back pressure. It also prevents the consumer from overrunning if there are pulling loads and ensures smooth action in consumers. 1 mark is awarded for each correct answer and 0.25 mark will be deducted for each wrong answer. You have valves of same bore diameter but of different types. Technician B says restricted exhaust can cause the EGR valve position sensor to fail. Page 3 info[at]objectivequiz[dot]com. 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