Maintenance of knife gate valve, installation and use instructions of knife gate valve

Knife gate valves need regular maintenance during use to ensure the normal operation and prolonged service life of the valve. Here are some common knife gate valve maintenance items:

1.Regularly check the sealing performance of the valve, especially the sealing between the seat and the blade, and replace or repair it if necessary.

2.Clean the inside and outside of the valve regularly, especially the seat and blade surfaces, to prevent the accumulation of dust and particulate matter from affecting sealing performance.

3.Regularly inspect the moving parts of the valve, such as the handwheel, transmission, etc., to ensure its flexibility and proper operation.

4.Regularly inspect the connecting bolts and gaskets of the valve and replace them if necessary.

5.During the valve deactivation, the valve should be closed and the valve should be painted and anti-corrosion.

The above are some common knife gate valve maintenance matters, the specific maintenance requirements should be based on different valve types, specifications and use conditions, it is recommended to follow the maintenance manuals and suggestions provided by the valve manufacturer.

1. The handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited.

2. The double gate gate valve should be installed vertically (that is, the valve stem is in a vertical position and the handwheel is at the top).

3. The gate valve with bypass valve should be opened before opening (to balance the pressure difference between the inlet and outlet and reduce the opening force).

4. The gate valve with the transmission mechanism shall be installed according to the provisions of the product instruction manual.

5. If the valve is often opened and closed, lubricate it at least once a month.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. Although the ranking may change due to time and market conditions, the following brands are generally considered to be among the top brands in the valve industry: Water System Valves and Industrial ValvesThe following more influential first-line brands can be used as a reference, but are for reference only:

Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

1.Before the installation of the knife gate valve, the valve cavity and sealing surface must be checked, and no dirt or sand particles are allowed to be attached;

2.The bolts of each connection part are required to be tightened evenly;

3.Check the packing part to be compressed, not only to ensure the tightness of the packing, but also to ensure that the ram is opened flexibly;

4.Before installing the valve, the user must calibrate the valve model, connection size and pay attention to the flow direction of the medium to ensure consistency with the valve requirements;

5.When installing the valve, the user must reserve the necessary space for the valve to drive;

6.The wiring of the drive device shall be carried out according to the circuit diagram;

7.The knife gate valve must be maintained regularly, and should not be collided and squeezed at will, so as not to affect the seal.

The knife gate valve can complete the action control and signal output of the opening and closing positions through the use of solenoid valves, proximity switches and other accessories, and can also complete the automatic control of continuous action. Knife gate valve is widely used in chemical industry, coal, sugar, sewage, papermaking and other fields, and is an ideal sealed gate valve. It is especially suitable for the paper industry to adjust and throttle the pipeline.

Attention should be paid to the following matters in the installation and maintenance of knife gate valves:

1. The handwheel, handle and transmission mechanism stool are not allowed to be used for lifting, and collision is strictly prohibited.

2. The double gate gate valve should be installed vertically (that is, the valve stem is in a vertical position and the handwheel is at the top).

3. The gate valve with bypass valve should be opened before opening (to balance the pressure difference between the inlet and outlet and reduce the opening force).

4. The gate valve with the transmission mechanism shall be installed according to the provisions of the product instruction manual.

5. If the valve is often opened and closed, lubricate it at least once a month.

The emergence of the knife gate valve solves the problems of large weight, large flow resistance, large area and difficult installation of ordinary gate valves, and can replace the general shut-off valve, which can work under the working pressure and operating temperature of -29-550. The gate of the knife gate valve has a shear function to scrape off the adhesive on the sealing surface and automatically remove debris, and the stainless steel gate prevents seal leakage caused by corrosion.

The knife gate valve is suitable for connecting or cutting off cement slurry, gold ore powder, mineral sand, slag, coal slime, pulp, wood pulp, tailings, fiber, dust, chemical treatment sewage, sedimentation tank, asphalt, silo export, fruit, grain, slaughterhouse wastewater and other media in the coal preparation, slag discharge, urban sewage treatment, food, papermaking, medicine, petroleum, chemical and other oil, water and steam pipelines of mining power plants.

Knife gate valve from the eighties into China, in less than 20 years, its scope of use from the ordinary field to a broader range of industries, from the mine power plant coal preparation, gangue, slag discharge, the development of urban sewage treatment, from the general industrial pipeline to food, health, medicine and other professional pipeline systems.

(1) Valve body, (2) Bracket, (3) Hand wheel: ductile iron (4) Valve core: stainless steel.

5) Rubber gasket.

6) PTFE well plates.

7) Packing: PTFE sealing ring.

8) Pressed lid: stainless steel.

9) Screw, (10) Stem nut: stainless steel.

11) Spell cap: 35

The manual knife gate valve is a special type of valve, and its working performance and installation steps are described below:

Working performance: 1Cut-off capacity: The manual knife gate valve has good cut-off performance, which can effectively cut off the flow of fluid and prevent leakage.

2.Fluid Flow Direction: Manual knife gate valves are suitable for one-way or two-way fluid flow direction, which can be selected according to needs.

3.Low flow resistance: Due to the relatively straight internal flow channel, the fluid flow resistance is small, which helps to reduce energy loss and fluid pressure drop.

4.Quick Opening and Closing: The ram of the manual knife gate valve can be quickly raised and lowered for quick opening and closing operation, which helps to quickly cut off the fluid in an emergency.

5.Adaptation to media: Manual knife gate valve is suitable for different media such as liquid, gas, particulate suspended solids, etc., and has strong adaptability.

Installation Steps: The following are general installation steps for manual knife gate valves, but specific steps may vary depending on the manufacturer and model. Please consult the product leaflet and follow the manufacturer's recommendations before installation.

1.Select the location: According to the process requirements, select the appropriate position to install the manual knife gate valve. Ensure that the valve is easy to operate and maintain, and is not hit by external forces.

2.Support Installation: Secure the valve in the installation position with the appropriate bracket or flange connection to ensure that the valve is secure without vibration or displacement.

3.Connecting the pipeline: connect the manual knife gate valve with the pipeline, connect it according to the connection method (flange, thread, etc.), and ensure that the connection is reliable and reliable.

4.Adjust the position: Adjust the opening and closing position of the valve, so that it can operate normally and control the flow of fluid in the working state.

5.Tighten the bolts: Make sure the connecting bolts of the valve are tightened reliably to avoid leakage and loosening.

6.Test Operation: After installation, test the operation of the manual knife gate valve, including the operation of opening, closing, and intermediate positions, to ensure that the valve is working properly.

7.Anti-corrosion and anti-rust: According to the environmental requirements, consider anti-corrosion and anti-rust treatment of the valve to prolong the service life of the valve.

Knife gate valves. Please note that the installation procedure for manual knife gate valves may vary depending on the model, connection and application requirements. During installation, make sure to follow the product instructions and manufacturer's recommendations to ensure the safe operation and proper operation of the valve.

If you have any questions, it is recommended to contact and consult with a professional engineer or manufacturer.

<> Manual knife gate valve installation drawing.

Working performance of manual knife gate valve.

The manual knife gate valve is equipped with the advantages of simple and compact structure, reasonable design, light material saving, reliable sealing, light and flexible operation, small size, smooth channel, small flow resistance, light weight, easy installation, easy disassembly, etc., and can work normally under the condition of working pressure and operating temperature -29-650. The knife gate valve has a shear function on the gate, which can scrape off the adhesive on the sealing surface and automatically remove debris, and the stainless steel gate can prevent seal leakage caused by corrosion.

Installation of manual knife gate valves.

1.Before installation, the valve cavity and sealing surface must be inspected, and dirt or sand particles are not allowed to be attached;

2.The bolts of each connection part are required to be evenly tightened;

3.Check the packing part to be compressed, not only to ensure the tightness of the packing, but also to ensure that the ram is opened flexibly;

4.Before installing the valve, the user must calibrate the valve model, the connection size and pay attention to the flow direction of the medium, and ensure the consistency with the valve requirements;

5.When installing the valve, the user must reserve the necessary space for the valve to drive;

6.The wiring of the drive device shall be carried out according to the circuit diagram;

7.The knife gate valve must be maintained regularly, and should not be collided and squeezed at will, so as not to affect the seal.

The knife gate valve is a common pipeline valve, which can usually operate normally in the following environments

Clean Environment: Knife gate valves can operate normally in a clean, dust-free, non-corrosive, non-corrosive gas or liquid environment.

Oil & Chemical Environment: Knife gate valves can operate normally in some environments involving petroleum, chemicals, etc., which usually require the selection of appropriate materials and sealing methods.

High-temperature and high-pressure environment: Knife gate valves can operate normally in high-temperature and high-pressure environments, but they need to choose materials and sealing structures that can withstand high temperatures and high pressures, and they need to be checked and maintained regularly.

Liquid and gaseous medium environment: The knife gate valve is suitable for the pipeline system of liquid and gaseous medium, which can control the flow, pressure and other parameters of the medium to ensure the stable operation of the pipeline system.

Hazardous areas: In some hazardous areas, knife gate valves can also operate normally, but it is necessary to select the materials and structures of the excitation valves that meet the safety standards to ensure safe operation.

Knife gate valve manufacturer.

In short, the knife gate valve can operate normally in a variety of open environments such as clean environment, oil and chemical environment, high temperature and high pressure environment, liquid gaseous medium environment and ** dangerous area, but it is necessary to select suitable valve materials and structures according to different application environments, and carry out regular inspection and maintenance to ensure the safe and reliable operation of the valve.

Knife gate valve can, temperature -29-650 working normally. The knife gate valve has a simple and compact structure, convenient design, light material saving, reliable sealing, light and flexible operation, smooth passage, low resistance, light weight, convenient installation of the square bridge, and easy to disassemble. Knife gate valves are mainly made of rubber excitation materials, such as the inside of the valve body, seals, valve plates, etc.

The float material and float shape of the knife gate valve have a good effect on the exhaust effect and service life.

In operation, all kinds of valves should be complete and intact. The bolts on the flange and bracket are indispensable, and the threads should be intact and not allowed to loosen. The fastening nut on the handwheel should be tightened in time if it is found to be loose to avoid wearing the connection or losing the handwheel and nameplate.

If the handwheel of the globe valve is lost, it is not allowed to be replaced by a live wrench, and it should be completed in time. The packing gland is not allowed to be skewed or without preload clearance. For the globe valve in the environment that is easily contaminated by rain, snow, dust, wind and sand, the valve stem should be installed with a protective cover.

The ruler on the globe valve should be kept intact, accurate, and clear. The seals, caps, and pneumatic accessories of the globe valve should be complete and intact. It is not allowed to knock, stand on the shut-off valve in operation, stand on the person or support the load; In particular, non-metallic valves and cast iron valves, it is necessary to prohibit the maintenance work of the valve grease before welding and before the production and after the valve professional maintenance work, which plays a vital role in the valve service production and operation, and the correct and orderly and effective maintenance will protect the valve, so that the valve can function normally and prolong the service life of the valve.

Valve maintenance may seem simple, but it's not. There are often overlooked aspects of work.

On the one hand, the amount of grease injection is small, the grease injection is insufficient, and the sealing surface accelerates wear due to the lack of lubricant. On the other hand, excessive grease injection causes waste. This is due to the fact that there is no accurate calculation of the sealing capacity of the different shut-off valves according to the valve type category.

The sealing capacity can be calculated according to the size and type of the shut-off valve, and then the appropriate amount of grease can be injected reasonably.

Clause. 2. When the globe valve is greased, the pressure problem is often ignored. During the grease injection operation, the grease injection pressure changes regularly in peaks and valleys. If the pressure is too low, the seal will leak or fail, the pressure will be too high, the grease injection port will be blocked, the lipid in the seal will harden, or the sealing ring will lock up with the valve ball and valve plate.

Usually, when the grease injection pressure is too low, the injected grease mostly flows into the bottom of the valve cavity, which generally occurs in small gate valves. If the grease injection pressure is too high, on the one hand, check the grease injection nozzle, and replace it if the grease hole is blocked; On the other hand, grease hardening involves the use of cleaning fluids to repeatedly soften the failed sealing grease and inject new grease to replace it. In addition, the sealing type and sealing material also affect the grease pressure, different sealing forms have different grease pressure, and the grease pressure of hard seal is generally higher than that of soft seal.

The ball valve is generally in an open state during maintenance, and it is closed for maintenance under special circumstances. Other valves should not be treated as open. The gate valve must be closed during maintenance to ensure that the grease fills the sealing groove along the sealing ring, and if it is opened, the sealing grease will fall directly into the flow channel or valve cavity, resulting in waste.

After installation, the globe valve should be inspected regularly, and the main inspection items are:

1) Wear of the sealing surface of the globe valve.

2) Trapezoidal thread wear of the stem and stem nut.

3) Whether the filler is outdated and invalid, if it is damaged, it should be replaced in time.

4) After the globe valve is overhauled and assembled, the sealing performance test should be carried out.