MANUAL GATE VALVE
OVERVIEW
The gate valve's opening and closing parts are the gates, and the gate's movement direction is perpendicular to the fluid direction. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces. The most commonly used mode is that the two sealing surfaces of the gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 5°, and 2° when the medium temperature is not high. 52' The gate has rigid gates and resilient seated gates. According to the different gates, the gate valve is divided into rigid gate valves and resilient seated valves.
ACTION MODE
When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, only by the medium pressure to press the sealing surface of the gate against the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves use forced sealing, that is, when the valve is closed, external force is used to force the gate against the valve seat to ensure the sealing of the sealing surface.
The gate of the gate valve moves linearly with the valve stem, also known as a rising stem gate valve. Usually there is a trapezoidal thread on the lifting stem, which converts the rotary motion into linear motion through the nut at the top of the valve and the guide groove on the valve body, that is, the operating torque into operating thrust.
Open Close
STRUCTURE
ADVANTAGES AND DISADVANTAGES
Advantages
1. Small flow resistance. The medium channel inside the valve body is straight, the medium flows in a straight line, and the flow resistance is small.
2. It is more labor-saving when opening and closing. Compared with the globe valve, the movement direction of the gate is perpendicular to the flow direction of the medium whether it is open or closed.
3. The height is large and the opening and closing time is long. The opening and closing stroke of the gate is large, and the lifting is carried out by the screw.
4. Water hammer phenomenon is not easy to occur. The reason is the long closing time.
5. The medium can flow in any direction on both sides, which is easy to install. The two sides of the gate valve channel are symmetrical.
6. The structural length (the distance between the two connecting end faces of the shell) is small.
7. The shape is simple, the structural length is short, the manufacturing process is good, and the application range is wide.
8. The structure is compact, the valve rigidity is good, the channel is smooth, the flow resistance is small, the sealing surface is made of stainless steel and hard alloy, the service life is long, the PTFE packing is used, the sealing is reliable, and the operation is light and flexible.
Disadvantages
1. Generally, the gate valve has two sealing surfaces, and the processing and manufacturing are more complicated than the globe valve.
2. There is relative friction between the sealing surfaces, which causes great wear and tear. It is inconvenient to repair the worn sealing surfaces.
3. The size of the valve cavity structure is large, which results in a long structure length, large external dimensions, large installation space, and large-diameter gate valves are particularly bulky.
4. The valve opening and closing time is long.
5. It can form a closed valve cavity, so a pressure relief structure should be set to prevent abnormal pressure rise in the cavity when necessary.
VALVE INTERNAL COMPONENT MATERIALS
Main methods of hardening treatment
Commonly used valve internal component materials are SUS304, SUS316, SUS316L, SUS410, SUS420, etc., and are processed accordingly according to different fluid conditions. For controlling cavitation fluids, fluids containing solid particles, and high-temperature and high-pressure situations, they must be hardened. treatment to extend the service life of the valve.
Heat treatment
a.304/316 solid solution treatment
This series of materials is austenitic stainless steel and is mainly used in working conditions where the medium is corrosive or in low-temperature situations. When the medium is highly corrosive, solution treatment must be carried out. The purpose of solution treatment is to improve the hardness and corrosion resistance of the material.
Temperature range -196~530°C
b.410/420 quenching and tempering treatment (quenching + tempering)
The material of this series is martensitic stainless steel, which is an excellent cavitation-resistant material. It must be quenched and tempered when used in high-temperature and high-pressure difference situations. The purpose of quenching and tempering treatment is to greatly improve the hardness of the material and extend its service life under harsh working conditions.
Temperature range -45~425°C
c.17-4PH precipitation hardening treatment
Different types and quantities of strengthening elements are added to the chemical composition of stainless steel, and different types and quantities of carbides, nitrides, carbides and intermetallic compounds are precipitated through the precipitation hardening process, which not only improves the strength of the steel but maintains sufficient toughness. A type of high-strength stainless steel, referred to as precipitation hardening.
Temperature range -45~425°C
Surface hardening treatment
Surface heat treatment is divided into two categories: surface quenching and surface chemical heat treatment.
a. Flame heating surface quenching, contact electric heating surface quenching, induction heating surface quenching, etc.
b. Carburizing, nitriding, carbonitriding, chromium boronizing, copper infiltrating, etc.
Surfacing treatment
Stellite cladding (main components Co, Cr, W) is a commonly used hardening treatment method with excellent corrosion resistance. There are two methods of Stellite surfacing: full surfacing and partial surfacing. There is no standard regulation for the specific surfacing method. It usually depends on the different pressures and temperatures of the fluid and whether the fluid contains particles.
PACKAGING PROTECTION MEASURES
Packaging structure and materials
The packaging should be designed to be both strong and lightweight to withstand various pressures and impacts during transportation. The materials used should have good weather resistance, chemical resistance and wear resistance to adapt to different transportation environments.
Sealing and leak-proof
The packaging adopts reliable sealing technology, such as heat sealing, glue sealing or the use of sealing rings, to ensure the air tightness and liquid tightness of the packaging.
Easy to handle and identify
The size and weight of the packaging conform to ergonomic principles, ensuring safe and convenient handling for handlers. At the same time, the packaging clearly indicates the cargo information, such as name, weight, and destination, for quick identification and classification.
Special cargo identification
For special goods, such as flammable, explosive, toxic, corrosive or radioactive substances, the corresponding dangerous goods label must be affixed to the packaging.
Dangerous goods packaging specifications
For special goods, such as flammable, explosive, toxic, corrosive or radioactive substances, the corresponding dangerous goods label must be affixed to the packaging.
CERTIFICATION
COMPANY OVERVIEW
Our company is located in Zhongbei Industrial Park, Xiqing District, Tianjin. It is a professional company integrating mechatronics, including design and development, production and assembly, sales and service of electric actuators and valve products.
The production base covers an area of 2,000 square meters
ENTERPRISE QUALITY INSPECTION QC PROCESS
01. Internal Testing
Check the sight glass and pointer for alignment.
Check the wiring for proper alignment.
Check the open and close limit cams for full engagement.
Check the pointer for full engagement.
Check the pointer position for alignment with the electric actuator.
Check the internal screws for tightness.
02. Appearance Inspection
Check for paint peeling/stains
Manual wrench
Waterproof connector
Manual dust plug
03. Product Type
Is the voltage consistent with the product foam box marking?
Is the control type consistent with the product foam box marking?
04.Marking
Use laser marking machine to mark product number
INSPECTION ITEMS FOR COMPLETE VALVE SETS
01. According to the information on the production order, check whether the following contents are consistent with the production order
Valve quantity
Valve diameter
Valve material
Valve connection method
Valve pressure
Actuator voltage
Actuator control type
Is the actuator explosion-proof?
02. Check the fastening screws
Check whether the screws between the valve and the electric actuator are tightened or not.
STANDARDIZED SAFETY PRODUCTION PROCESS IN THE WORKSHOP
Arrange
Remove and organize unwanted items, free up space, utilize space flexibly, prevent misuse and misplacement, and shape the overall workplace.
Organize
Locate and mark the items you need, organize them, make the workplace clear at a glance, create a tidy work environment, and shorten the time it takes to find items.
Cleaning
Maintain a clean, tidy, pleasant working environment, stable quality, and reduce industrial accumulation.
Tidy
Maintain previous 3S results, clean, maintain 3S results, and leave a good impression on customers.
Quality
Develop good habits and qualities of abiding by regulations, cultivate good habits of employees who abide by the rules, and create a team spirit.
THE STATUS AND ROLE OF 5S
1. Improve corporate image
2. Improve productivity and work efficiency
3. Improve production turnover
4. Reduce failures and ensure quality
5. Strengthen safety and reduce potential safety hazards
FAQ
How about your price?
Although high quality but the price is vary favorable.
What's your MOQ?
One piece.
What is the delivery time?
It is about 2-4 weeks after we receive the payment.
Do you have products in stock?
Yes, some stock can be shipped out within 3 days.
Do you test all your goods before delivery?
Yes, all products are fully inspected before delivery.
What is the warranty?
Our warranty is one year. After you receive the goods, if you find defect products, just take pics or videos to send us. We will re-make it for re-fund them to customers once we confirm it is our responsibilities.
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