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. These are also called as sluice valves. Learn. Subject to change, status 2020-06-24 17:31:16 . Here’s a look at a few other types of flow control valves. Globe valves; These are used in household plumbing. For other valve types, such as globe, the characteristic can be changed to suit the application. We have already discussed the important types of hydraulic valves. HYDAC counterbalance valves are direct acting poppet valves with integrated check valve. Counterbalance valves. Write. Page 3 info[at]objectivequiz[dot]com. Which technician … … 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. 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.. 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. So gate valve is closed to discontinue the supply and repairing is carried out. This type of valve generally has a wider range of spring adjustment than direct-acting valves and provides better repetitive accuracy. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. Hydraulics & Fluid Machineries MCQ Question with Answer For starting an axial flow pump, its delivery valve should be. Some valves have an inherent characteristic that cannot be changed, such as full port ball valves and butterfly valves. 1 mark is awarded for each correct answer and 0.25 mark will be deducted for each wrong answer. In order to prevent a loaded cylinder from drifting, a poppet-type valve must be used. Working • This type of valve (which is normally open) is used to maintain reduced pressures in specified locations of hydraulic systems. either type relief valve. Standard poppet type differential area ; Special cavity, Sun T-11A; Maximum operating pressure 350 bar; Maximum flow 60 l/min; Data sheets. Push button. Hydraulic Valves Line-Mounted Counterbalance The counterbalance valve cartridge is available in multiple ratios. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) In load-holding applications, it can be used as a hose-break valve. 2 Different types of counterbalance valve. B. 4 How to specify(See Pro course) 7. 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. Spell. 4 Design Tips, techniques and potential issues (See Pro course)CounterbalCounterbal. AT211 MCQ. Counterbalance valves with pilot assist are meant to control an overrunning load. 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 Gate valves; The valve which is used to regulate the water supply or flow in the mains is known as gate valves. #8 Spool – Tandem Spool. AA2.030 Initially, flow passes freely from 2 to 1. Standard poppet type differential area × Counterbalance valves Standard poppet type differential area . Test. PLAY. Uses include controlling over-running loads in cylinders and motors. It is not efficient to run two compressors B. Pressure adjustment from 1000 to 5000 PSI. This test comprises of 50 questions on Hydraulics and Pneumatics. This course is designed to familiarize participants with the functions performed by various types of valves used in hydraulic systems. If primary pressure exceeds the pressure setting, fluid is released to keep the pressure constant. This section will deal with the counterbalance valves, an important valve used for holding heavy loads. Counterbalance valves are also known as load holding valves because of its ability to safely hold heavy loads. Counterbalance Valves. Inlet pressue rating of aluminum body is 3000 PSI. Figure 9.2.4 shows a diagram of a typical piston type, pilot operated safety valve. Which of the following is Match. Its function is to control the speed of a consumer according to the inlet flow. Popular Spool Types #2 Spool – Standard Directional Valve for Cylinder Operation – Blocked Center. When the pressure at 1 exceeds the pressure setting, the valve acts to restrict input flow at 2. It is actuated by downstream pressure and tends to close as this pressure reaches the valve setting. Butterfly valve. 1-2 What counterbalance valves are used for. 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. Flashcards. However, in hydraulic applications, oil contamination can block flow to the pilot valve, and the main valve will fail to close properly. It also prevents the consumer from overrunning if there are pulling loads and ensures smooth action in consumers. PRESSURE REDUCING AND RELIEVING, DIRECT ACTING SPOOL TYPE COMMON CAVITY VRPR-10A SIZE 10 04.95.04 - X - 85 - Z Rev.0605 Page. 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. The piston type valve consists of a main valve, which uses a piston shaped closing device (or obturator), and an external pilot valve. 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. 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. Counterbalance valves are available with either poppet- or spool-type pressure control elements. 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. Counterbalance valves are also used to prevent a loaded cylinder from falling, but their operation is smoother than a pilot-operated check valve. When repairing is required, then supply has to be cut off. #0 Spool – Same as Above – All Ports Relieved in Center Position. 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. 2. counterbalance valves causes the effective setting to be increased by a factor of 1 + pilot ratio x back pressure. 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. Indeed, they enable a jerk-free movement on the part of consumers in the presence of over-centre loads. Used to control the operating sequence of two or more actuators. Counterbalance Valve BVD Replaces: 04.08 Series 41 Size NG20, 25 Nominal pressure 350 bar Peak pressure 420 bar for travel drives, winch drives and track drives Contents 2 Design and Safety Instructions 4 Technical Data 4 6 Dimensions, Size 20 8 Dimensions, Size 25 9 Fixing the Counterbalance Valve 10 Port Types 11 Cross-References 11 General Instructions 12 . After completing this course, participants should be able to describe how valves control flow rate, flow direction, and pressure in a hydraulic system. 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. Types of valves. 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. This is also used on cylinder control when cylinders have load holding checks or counterbalance valves. The valve body is available with different port sizes and thread types. 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. Parker counterbalance valves are screw-in type cartridge valves that control the pressure at an actuator controlling its motion. Take practice test of each chapter 3. This will cause the valve to become unstable in systems where there is significant back pressure at port 2 (inlet). Load Holding Motion Control valve - Counterbalance valve VBSO-DE-FC2 05.42.06 - X - Y - Z. • A pressure-reducing valve uses a spring-loaded spool to control the downstream pressure. You have valves of same bore diameter but of different types. Also, valves provide security while handling heavy loads. COUNTERBALANCE, STANDARD POPPET TYPE DIFFERENTIAL AREA COMMON CAVITY VBSN-20A SIZE 20 04.52.25 - X - 58 - Z. Counterbalance valve VBSN-08U-TF 04.52.37 - X - 20 - Z. Counterbalance valve VBSN-08U-TF 04.52.37 - X - 20 - Z. This paper presents the structure and working principle of counterbalance valve used in some hydraulic cranes. #6 Spool – Motor Spool – Both Work Ports to Tank in Center Position. Gravity. 1-2 How counterbalance valves work. After minor rearrangements, Equation 1 takes the form . 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. A wider range of spring adjustment than direct-acting valves and provides better repetitive accuracy close as pressure. ( inlet ) provides better repetitive accuracy deal with the functions performed by various of... 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