B. 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. Figure 9.2.4 shows a diagram of a typical piston type, pilot operated safety valve. 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 This section will deal with the counterbalance valves, an important valve used for holding heavy loads. 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. Also, valves provide security while handling heavy loads. Pressure adjustment from 1000 to 5000 PSI. After minor rearrangements, Equation 1 takes the form . Counterbalance valves are also used to prevent a loaded cylinder from falling, but their operation is smoother than a pilot-operated check valve. The piston type valve consists of a main valve, which uses a piston shaped closing device (or obturator), and an external pilot valve. Hydraulic Valves Line-Mounted Counterbalance The counterbalance valve cartridge is available in multiple ratios. Popular Spool Types #2 Spool – Standard Directional Valve for Cylinder Operation – Blocked Center. However, in hydraulic applications, oil contamination can block flow to the pilot valve, and the main valve will fail to close properly. Take practice test of each chapter 3. Indeed, they enable a jerk-free movement on the part of consumers in the presence of over-centre loads. This will cause the valve to become unstable in systems where there is significant back pressure at port 2 (inlet). HYDAC counterbalance valves are direct acting poppet valves with integrated check valve. 4 Design Tips, techniques and potential issues (See Pro course)CounterbalCounterbal. So gate valve is closed to discontinue the supply and repairing is carried out. either type relief valve. Gate valves; The valve which is used to regulate the water supply or flow in the mains is known as gate valves. 2. counterbalance valves causes the effective setting to be increased by a factor of 1 + pilot ratio x back pressure. When the pressure at 1 exceeds the pressure setting, the valve acts to restrict input flow at 2. Counterbalance valves with pilot assist are meant to control an overrunning load. Spring. Gravity. 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.. PLAY. 3 Tips for operating and maintaining (See Pro course) 5. Which of the following is Test. Counterbalance Valves. After completing this course, participants should be able to describe how valves control flow rate, flow direction, and pressure in a hydraulic system. 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. This paper presents the structure and working principle of counterbalance valve used in some hydraulic cranes. 4. In order to prevent a loaded cylinder from drifting, a poppet-type valve must be used. 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. AT211 MCQ. 1 mark is awarded for each correct answer and 0.25 mark will be deducted for each wrong answer. Hydraulics & Fluid Machineries MCQ Question with Answer For starting an axial flow pump, its delivery valve should be. Parker counterbalance valves are screw-in type cartridge valves that control the pressure at an actuator controlling its motion. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) You have valves of same bore diameter but of different types. 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. 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. Push button. It is actuated by downstream pressure and tends to close as this pressure reaches the valve setting. Each valve is capable of 350 bar (5075 psi) and now available in pre-engineered dual counterbalance HICs. Globe valves; These are used in household plumbing. COUNTERBALANCE, STANDARD POPPET TYPE DIFFERENTIAL AREA COMMON CAVITY VBSN-20A SIZE 20 04.52.25 - X - 58 - Z. 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. 1-2 What counterbalance valves are used for. 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 . 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. Which technician … Additional Technical Data. 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 Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. Butterfly valve. STUDY. 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. Working • This type of valve (which is normally open) is used to maintain reduced pressures in specified locations of hydraulic systems. This test comprises of 50 questions on Hydraulics and Pneumatics. These are also called as sluice valves. #6 Spool – Motor Spool – Both Work Ports to Tank in Center Position. Created by. Counterbalance valves are available with either poppet- or spool-type pressure control elements. When repairing is required, then supply has to be cut off. Load Holding Motion Control valve - Counterbalance valve VBSO-DE-FC2 05.42.06 - X - Y - Z. 1-2 How counterbalance valves work. Page 3 info[at]objectivequiz[dot]com. Standard poppet type differential area ; Special cavity, Sun T-11A; Maximum operating pressure 350 bar; Maximum flow 60 l/min; Data sheets. 2 Different types of counterbalance valve. 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. Inlet pressue rating of aluminum body is 3000 PSI. 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. Match. 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. This is also used on cylinder control when cylinders have load holding checks or counterbalance valves. Counterbalance valves. AA2.030 Initially, flow passes freely from 2 to 1. Standard poppet type differential area × Counterbalance valves Standard poppet type differential area . For other valve types, such as globe, the characteristic can be changed to suit the application. Subject to change, status 2020-06-24 17:31:16 . 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 . We have already discussed the important types of hydraulic valves. Counterbalance valves are also known as load holding valves because of its ability to safely hold heavy loads. Az2d41a359f. 3. 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? In a hydraulic lift _____ is fixed on the crown of the sliding ram where the carried load is located. A. 4 How to specify(See Pro course) 7. The valve body is available with different port sizes and thread types. Types of valves. 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