4 How to specify(See Pro course) 7. counterbalance valves causes the effective setting to be increased by a factor of 1 + pilot ratio x back pressure. VODL/CC 38 VODL/CC 12 VODL/CC 34 VODL/CC 100 Nominal flow 35 l/min (9.2 US gpm) 70 l/min (18.5 US gpm) 100 l/min (26.4 US gpm) 180 l/min (47.6 US gpm) Max. Sun four port counterbalance valves add a drain port (port 4) to the cartridge which makes the valve insensitive to back pressure at port 2. Figure 9.2.4 shows a diagram of a typical piston type, pilot operated safety valve. Write. Question 9: In a 5/2 way single solenoids valve what is the actuation mechanism of the position of the valve which is other than solenoid actuated? After completing this course, participants should be able to describe how valves control flow rate, flow direction, and pressure in a hydraulic system. Counterbalance valves are available with either poppet- or spool-type pressure control elements. In load-holding applications, it can be used as a hose-break valve. Parker counterbalance valves are screw-in type cartridge valves that control the pressure at an actuator controlling its motion. Page 3 info[at]objectivequiz[dot]com. Test. Push button. Inlet pressue rating of aluminum body is 3000 PSI. Two compressors should not be run in parallel because A. Technician B says restricted exhaust can cause the EGR valve position sensor to fail. AT211 MCQ. Each valve is capable of 350 bar (5075 psi) and now available in pre-engineered dual counterbalance HICs. Which of the following is Take practice test of each chapter 3. Pressure adjustment from 1000 to 5000 PSI. Type VODL/CC counterbalance valves • Double acting • Relief compensated Technical specifications and diagrams are measured with mineral oil of 46 cSt viscosity at 40°C (104°F) temperature. These are also called as sluice valves. 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. Match. VOSLP 38 VOSLP 12 VOSLP 34 VOSLP 100 Nominal flow 35 l/min (9.2 US gpm) 70 l/min (18.5 US gpm) 100 l/min (26.4 US gpm) 180 l/min (47.6 US gpm) Max. Created by. B. Load Holding Motion Control valve - Counterbalance valve VBSO-DE-FC2 05.42.06 - X - Y - Z. This section will deal with the counterbalance valves, an important valve used for holding heavy loads. COUNTERBALANCE, STANDARD POPPET TYPE DIFFERENTIAL AREA COMMON CAVITY VBSN-20A SIZE 20 04.52.25 - X - 58 - Z. 4 Design Tips, techniques and potential issues (See Pro course)CounterbalCounterbal. Sort By: Standard Pilot Assisted Load Control Valves. Designation counterbalance valve, non-vented Design poppet type, free reverse flow, pilot assisted Mounting method screw-in cartridge 7/8-14 UNF-2A or M20x1.5mm Size SAE 10 / NG 8, cavity type C1025 or T-11A Weight 0.62 lbs (0.28 kg) Mounting attitude design B: unrestricted design S,C,T: hanging or horizontal mounting position Flashcards. It will give over capacity in the system C. There is possibility of losing oil from the compressors D. A and B Answer-C Important Question for MMD 16. #6 Spool – Motor Spool – Both Work Ports to Tank in Center Position. If primary pressure exceeds the pressure setting, fluid is released to keep the pressure constant. Its function is to control the speed of a consumer according to the inlet flow. Type 4: Counterbalance Valve External Pilot-Internal Drain Operations Graphic Symbols Descriptions Used to prevent gravitatio- nal falls by generating a pressure on the actuator return side. #0 Spool – Same as Above – All Ports Relieved in Center Position. However, in hydraulic applications, oil contamination can block flow to the pilot valve, and the main valve will fail to close properly. Here’s a look at a few other types of flow control valves. Butterfly valve. Subject to change, status 2020-06-24 17:31:16 . Ideally the inherent valve characteristic should be chosen to give an installed characteristic as close as possible to linear (see inherent vs installed characteristic). Additional Technical Data. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) Some valves have an inherent characteristic that cannot be changed, such as full port ball valves and butterfly valves. This paper presents the structure and working principle of counterbalance valve used in some hydraulic cranes. Working • This type of valve (which is normally open) is used to maintain reduced pressures in specified locations of hydraulic systems. 3-4 Typical operating characteristic(See Pro course) 6. PRESSURE REDUCING AND RELIEVING, DIRECT ACTING SPOOL TYPE COMMON CAVITY VRPR-10A SIZE 10 04.95.04 - X - 85 - Z Rev.0605 Page. When repairing is required, then supply has to be cut off. Gate valves; The valve which is used to regulate the water supply or flow in the mains is known as gate valves. This course is designed to familiarize participants with the functions performed by various types of valves used in hydraulic systems. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. The piston type valve consists of a main valve, which uses a piston shaped closing device (or obturator), and an external pilot valve. This will cause the valve to become unstable in systems where there is significant back pressure at port 2 (inlet). 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.. Hydraulics & Fluid Machineries MCQ Question with Answer For starting an axial flow pump, its delivery valve should be. Types of valves. • A pressure-reducing valve uses a spring-loaded spool to control the downstream pressure. Counterbalance Valves. 4. Az2d41a359f. Counterbalance valves with pilot assist are meant to control an overrunning load. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. Standard poppet type differential area × Counterbalance valves Standard poppet type differential area . 2. 1-2 What counterbalance valves are used for. Counterbalance valves. 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. So gate valve is closed to discontinue the supply and repairing is carried out. Which technician … We have already discussed the important types of hydraulic valves. 2 Different types of counterbalance valve. 3 Tips for operating and maintaining (See Pro course) 5. MCQ 15. This test comprises of 50 questions on Hydraulics and Pneumatics. AA2.030 Initially, flow passes freely from 2 to 1. Counterbalance valves are also used to prevent a loaded cylinder from falling, but their operation is smoother than a pilot-operated check valve. In order to prevent a loaded cylinder from drifting, a poppet-type valve must be used. A. It is actuated by downstream pressure and tends to close as this pressure reaches the valve setting. Type VOSLP counterbalance valves • Single acting Technical specifications and diagrams are measured with mineral oil of 46 cSt viscosity at 40°C (104°F) temperature. Indeed, they enable a jerk-free movement on the part of consumers in the presence of over-centre loads. After minor rearrangements, Equation 1 takes the form . Counterbalance valves are also known as load holding valves because of its ability to safely hold heavy loads. Counterbalance Valve Poppet Type, Direct-Acting Cartridge – 350 bar SBVE-R1 and SBVE-R1/2 Up to 100 l/min Up to 350 bar HYDAC counterbalance valves are direct-acting poppet valves with integrated check valve which enable smooth action in consumers if there are retracting and extending loads. In a hydraulic lift _____ is fixed on the crown of the sliding ram where the carried load is located. #8 Spool – Tandem Spool. Spring. Key Concepts: Terms in this set (36) Technician A says that a low-restriction exhaust system could prevent a back-pressure type vacuum-controlled EGR valve from opening correctly. 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. Uses include controlling over-running loads in cylinders and motors. Popular Spool Types #2 Spool – Standard Directional Valve for Cylinder Operation – Blocked Center. 3. … 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 This type of valve generally has a wider range of spring adjustment than direct-acting valves and provides better repetitive accuracy. The valve body is available with different port sizes and thread types. When the pressure at 1 exceeds the pressure setting, the valve acts to restrict input flow at 2. Spell. Standard poppet type differential area ; Special cavity, Sun T-11A; Maximum operating pressure 350 bar; Maximum flow 60 l/min; Data sheets. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. Also, valves provide security while handling heavy loads. It is not efficient to run two compressors B. 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. Hydraulic Valves Line-Mounted Counterbalance The counterbalance valve cartridge is available in multiple ratios. Gravity. The check valve allows free flow from the directional valve (port 2) to the load (port 1) while a direct-acting, pilot-assisted relief valve controls flow from port 1 to port 2. 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 . 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. 1-2 How counterbalance valves work. For other valve types, such as globe, the characteristic can be changed to suit the application. STUDY. PLAY. This is also used on cylinder control when cylinders have load holding checks or counterbalance valves. either type relief valve. You have valves of same bore diameter but of different types. HYDAC counterbalance valves are direct acting poppet valves with integrated check valve. 1 mark is awarded for each correct answer and 0.25 mark will be deducted for each wrong answer. Comatrol’s counterbalance portfolio now includes 9 cartridge valves with a flow range extending from 20 LPM (5 US gpm) to 266 LPM (70 US gal/min) at 22 bar (319 psi) pressure drop. Counterbalance valve VBSN-08U-TF 04.52.37 - X - 20 - Z. Counterbalance valve VBSN-08U-TF 04.52.37 - X - 20 - Z. Learn. It also prevents the consumer from overrunning if there are pulling loads and ensures smooth action in consumers. Globe valves; These are used in household plumbing. 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