The document summarizes different types of pressure control valves used in hydraulic systems. It describes pressure relief valves, pressure reducing valves, unloading valves, counterbalance valves, and pressure sequence valves. Each type of valve is explained in terms of its working, symbol, and purpose of controlling pressure in hydraulic circuits. Compound versions of some valves are also discussed.
Control of a single-acting and double-acting cylinder, regeneration, motor braking, speed control, synchronisation, fail safe, two handed, application of counterbalance, sequence, unloading, pressure reducing, pilot operated check valve
Control of a single-acting and double-acting cylinder, regeneration, motor braking, speed control, synchronisation, fail safe, two handed, application of counterbalance, sequence, unloading, pressure reducing, pilot operated check valve
HYDRAULIC POWER GENERATING AND UTILIZING SYSTEMS
Introduction to fluid power system - Hydraulic fluids - functions, types, properties, selection and application.
POWER GENERATING ELEMENTS: Pumps, classification, working of different pumps such as Gear, Vane, Piston (axial and radial), pump performance or characteristics, pump selection factors- simple Problems.
POWER UTILIZING ELEMENTS: Fluid Power Actuators: Linear hydraulic actuators – Types and construction of hydraulic cylinders – Single acting, Double acting, special cylinders like tandem, Rodless, Telescopic, Cushioning mechanism.
Hydraulic Motors, types – Gear, Vane, Piston (axial and radial) – performance of motors.
In hydraulic and pneumatic systems flow control valves are necessary to vary the speed of actuator. Flow control valves are placed in between Actuator and Direction Control (DC) Valve
Hydraulic Valves and Hydraulic System AccessoriesRAHUL THAKER
Hydraulic Valves and Hydraulic System Accessories:
Direction control valves,Pressure control valves, Flow control valves, Non-return valves, Reservoirs,Accumulators, Heating & cooling devices, Hoses. Selection of valves for circuits.
The pressure energy is fed to the actuator through a number of control block called valves.
• Various type of valve are used in hydraulic system to control or regulate the flow medium.
• Basicallyvalvesareexpectedtocontrol: – Direction
– Pressure
– Flow
– Otherspecialfunctions.
Electro hydraulic system Components and their operationSrichandan Subudhi
After this presentation you will be knowing:
1.What are DCVs, its type and their uses
2.About Check Valves and pilot controlled check valves
3.What are solenoid actuated valves and their operation
4.What are proportional solenoid valves and their operation
5.Servo Valve Operation
6.Servo Valve Connector
HYDRAULIC POWER GENERATING AND UTILIZING SYSTEMS
Introduction to fluid power system - Hydraulic fluids - functions, types, properties, selection and application.
POWER GENERATING ELEMENTS: Pumps, classification, working of different pumps such as Gear, Vane, Piston (axial and radial), pump performance or characteristics, pump selection factors- simple Problems.
POWER UTILIZING ELEMENTS: Fluid Power Actuators: Linear hydraulic actuators – Types and construction of hydraulic cylinders – Single acting, Double acting, special cylinders like tandem, Rodless, Telescopic, Cushioning mechanism.
Hydraulic Motors, types – Gear, Vane, Piston (axial and radial) – performance of motors.
In hydraulic and pneumatic systems flow control valves are necessary to vary the speed of actuator. Flow control valves are placed in between Actuator and Direction Control (DC) Valve
Hydraulic Valves and Hydraulic System AccessoriesRAHUL THAKER
Hydraulic Valves and Hydraulic System Accessories:
Direction control valves,Pressure control valves, Flow control valves, Non-return valves, Reservoirs,Accumulators, Heating & cooling devices, Hoses. Selection of valves for circuits.
The pressure energy is fed to the actuator through a number of control block called valves.
• Various type of valve are used in hydraulic system to control or regulate the flow medium.
• Basicallyvalvesareexpectedtocontrol: – Direction
– Pressure
– Flow
– Otherspecialfunctions.
Electro hydraulic system Components and their operationSrichandan Subudhi
After this presentation you will be knowing:
1.What are DCVs, its type and their uses
2.About Check Valves and pilot controlled check valves
3.What are solenoid actuated valves and their operation
4.What are proportional solenoid valves and their operation
5.Servo Valve Operation
6.Servo Valve Connector
This slides are about inline injection pump and calibration of the pumps .The working of the pump is described in simple words and with examples of daily usable devices.
A shuttle valve is a type of valve which allows fluid to flow through it from one of two sources. Generally a shuttle valve is used in pneumatic systems, although sometimes it will be found in hydraulic systems.
Hydraulics is a branch of science which deals with hydraulic fluid. It is used in places where cleanliness is not a priority but requires huge power to perform tasks.
application:
1. Industrial: Plastic processing machineries, steel making and primary metal extraction applications, automated production lines, machine tool industries, paper industries, loaders, crushes, textile machineries, R & D equipment and robotic systems etc.
2 Mobile hydraulics: Tractors, irrigation system, earthmoving equipment, material handling equipment, commercial vehicles, tunnel boring equipment, rail equipment, building and construction machineries and drilling rigs etc.
3 Automobiles: It is used in the systems like breaks, shock absorbers, steering system, wind shield, lift and cleaning etc.
4 Marine applications: It mostly covers ocean going vessels, fishing boats and navel equipment.
5 Aerospace equipment: There are equipment and systems used for rudder control, landing gear, breaks, flight control and transmission etc. which are used in airplanes, rockets and spaceships.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
1. Gujarat Power Engineering & Research Institute
1
Oil Hydraulics & Pneumatics
Prepared By:-
Patel Pranav V. (131040119042)
Guided By:-
Prof. Parin Patel
10/17/2016
3. Pressure Control Valves
• In order to avoid hydraulic system damage, power wastage
and overheating of the hydraulic fluid, circuit designers use a
variety of cleverly designed systems to control maximum
system pressure and pump flow during non-action periods.
• Pressure-control valves are used in hydraulic systems to
control actuator force (force = pressure × area)and to
determine and select pressure levels at which certain machine
operations must occurs.
ACTUATOR FORCE = Pressure(P)* Area(A).
4. Functions
• Limiting maximum system pressure at a safe level.
• Regulating/reducing pressure in certain portions of the
circuit.
• Unloading system pressure.
• Assisting sequential operation of actuators in a circuit with
pressure control.
• Any other pressure-related function by virtue of pressure
control.
• Reducing or stepping down pressure levels from the main
circuit to a lower pressure in a sub-circuit.
7. Working
• It is for limiting the pressure in a hydraulic system or in a part
of the system.
• The pressure can rise in a hydraulic system if:
- the flow rate from the pump is larger than the flow rate
through the actuator
- the volume of a closed system is reduced.
- the load of the actuator rises.
- heat is introduced into a closed system.
- the hydraulic resistance of the system rises.
8. Continue...
• Pressure-relief valves limit the maximum pressure in a
hydraulic circuit by providing an alternate path for fluid flow
when the pressure reaches a preset level.
• All fixed-volume pump circuits require a relief valve to protect
the system from excess pressure. Fixed-volume pumps must
move fluid when they turn.
• When a pump unloads through an open-centre circuit or
actuators are in motion, fluid movement is not a problem.
• A relief valve is essential when the actuators stall with the
directional valve still in shifted position.
9. Symbol of Pressure-Relief Valves
•If the hydraulic system does not accept any flow, then all the
pump flow must return to the tank via the relief valve.
• The pressure-relief valve provides protection against any
overloads experienced by the actuators in the hydraulic system.
• A relief valve is not needed if a pressure-compensated vane
pump is used.
11. Working
• The pilot-operated pressure-relief valve has a pressure port that is
connected to the pump line and the tank port is connected to the tank.
The pilot relief valve is a poppet type.
• The main relief valve consists of a piston and a stem. The main relief
piston has an orifice drilled through it. The piston has equal areas exposed
to pressure on top and bottom and is in a balanced condition due to equal
force acting on both the sides.
• It remains stationary in the closed position. The piston has a light bias
spring to ensure that it stays closed. When the pressure is less than that of
relief valve setting, the pump flow goes to the system.
• If the pressure in the system becomes high enough, it moves the pilot
poppet off its seat. A small amount of flow begins to go through the pilot
line back to the tank.
• Once flow begins through the piston orifice and pilot line, a pressure drop
is induced across the piston due to the restriction of the piston orifice.
• This pressure drop then causes the piston and stem to lift off their seats
and the flow goes directly from the pressure port to the tank.
13. Working
• This type of valve (which is normally open) is used to maintain
reduced pressures in specified locations of hydraulic systems.
It is actuated by downstream pressure and tends to close as
this pressure reaches the valve setting.
• A pressure-reducing valve uses a spring-loaded spool to
control the downstream pressure. If downstream pressure is
below the valve setting, the fluid flows freely from the inlet to
the outlet.
• When the outlet (downstream) pressure increases to the
valve setting, the spool moves to the right to partially block
the outlet port. Just enough flow is passed to the outlet to
maintain its preset pressure level. If the valve closes
completely, leakage past the spool causes downstream
pressure to build up above the valve setting.
14. Compound Pressure-reducing valve
• The "pressure override" which is caused by the direct-acting relief valve
may find applications in some areas. However, in others it may result in a
considerable input-power loss owing to the fluid lost through the valve
during the wide "pressure override" band.
• Owing to the inertia of the valve poppet and the spring, there is sudden
increase in pressure on the valve inlet side which gives rise to pressure
peaks beyond the adjusted "full flow pressure" and may well exceed the
maximum permissible pressure rating of other components within the
circuit.
• The compound-relief valve lowers the "pressure override" to the
minimum i.e. approximately 100-150 KPa. It also eliminates pressure
peaks almost completely, thus the compound relief valve provides a safe
and economical solution, and is the most commonly used type in
industrial systems.
16. Working
• Unloading valves are pressure-control devices that are used to
dump excess fluid to the tank at little or no pressure.
• A common application is in high-low pump circuits where two
pumps move an actuator at high speed and low pressure. The
circuit then shifts to a single pump providing a high pressure
to perform work.
• Another application is sending excess flow from the cap end
of an oversize-rod cylinder to the tank as the cylinder retracts.
• This makes it possible to use a smaller, less-expensive
directional control valve while keeping pressure drop low.
17. Compound Unloading valve
• A pilot-operated unloading relief valve is the same as a pilot-
operated relief valve with the addition of an unloading spool.
• Without the unloading spool, this valve would function just
like any pilot-operated relief valve.
• Pressure build up in the pilot section would open some flow
to the tank and unbalance the poppet, allowing it to open and
relieve excess pump flow.
19. Working
• These normally closed valves are primarily used to maintain a back
pressure on a vertical cylinder to prevent it from falling due to gravity.
• They are used to prevent a load from accelerating uncontrollably. This
situation can occur in vertical cylinders in which the load is a weight.
• This can damage the load or even the cylinder itself when the load is
stopped quickly at the end of the travel.
• This situation can occur in vertical cylinders in which the load is a weight.
This can damage the load or even the cylinder itself when the load is
stopped quickly at the end of the travel. valve’s primary port is connected
to the cylinder’s rod end and the secondary port to the directional
• control valve. The pressure setting is slightly higher than that required to
keep the load from free-falling.
• When the pressurized fluid flows to the cylinder’s cap end, the cylinder
extends, increasing pressure in the rod end and shifting the main spool in
the counterbalance valve. This creates a path that permits the fluid to flow
through the secondary port via the directional control valve and to the
reservoir. As the load is raised, the integral check valve opens to allow the
cylinder to retract freely.
21. Working
• A sequence valve is a pressure-control valve that is used to
force two actuators to operate in sequence.
• Instead of sending flow back to the tank, a sequence valve
allows flow to a branch circuit, when a preset pressure is
reached.
• The check valve allows the sequence valve to be bypassed in
the reverse direction.
• The component enclosure line indicates that the check valve
is an integral part of the component. The sequence valve has
an external drain line; therefore, a line must be connected
from the sequence valve’s drain port to the tank.