Performance comparison of fire gate valves, what material is used for fire gate valves

Gate valve is a kind of valve that is widely used in pipelines, which mainly plays the role of connecting and cutting off the medium. It is not suitable for adjusting the flow rate of the medium, but the flow rate can be judged according to the height of the valve stem lift (for example, the elastic seat seal gate valve for fire protection is equipped with an opening and closing scale). Compared with other valves, gate valves have a wide range of applications for pressure, temperature, caliber and other requirements.

According to the different internal structures, gate valves can be divided into: wedge single gate type, elastic gate type, double gate type, and parallel gate type. According to the different stem brackets, it can be divided into: open rod gate valve and dark rod gate valve.

The main performance advantages of the gate valve are: 1. The fluid resistance of the valve is small, because the valve body of the gate valve is a straight-through type, the flow of the medium does not change the direction, so the flow resistance is smaller than that of other valves. 2. The sealing performance is better than that of the globe valve, and the opening and closing is also less labor-saving than the globe valve.

3. It has a wide range of applications, in addition to steam, oil and other media, it is also suitable for media containing granular solids and large viscosity, and is also suitable for venting valves and valves of low vacuum systems. 4. The gate valve is a valve with double flow direction, which is not limited by the flow direction of the medium, so it is suitable for pipelines where the medium may change the flow direction, and it is also easy to install. The main performance disadvantages of gate valves are:

1. The design size is high, and the starting and closing time is long. When opening, the valve plate needs to be lifted to the upper part of the valve cavity, and when it is closed, it is necessary to drop all the valve plates into the valve seat, so the opening and closing stroke of the valve plate is large and the time is long. 2. Due to the friction between the valve plate and the valve seat of the gate valve during the opening and closing process, the sealing surface is easy to be scratched, which has an impact on the sealing performance and service life, and is not easy to maintain.

Performance comparison of several different structure gate valves: (1) Wedge single gate valve a, the structure is simpler than the elastic gate valve b, at higher temperatures, the sealing performance is not as good as the elastic gate valve or double gate valve. c. It is suitable for high-temperature media that are easy to coke.

2) Elastic gate valve a, it is a special form of wedge single gate valve. Compared with the wedge gate valve, at high temperature, the sealing performance is good, and the ram is not easy to be stuck after heating; b. It is suitable for steam, high-temperature oil and oil and gas medium, and is suitable for the parts with frequent switching. c. Not suitable for medium that is easy to coke.

3) Double gate gate valve a, the sealing performance is better than the wedge gate valve, when the tilt angle of the sealing surface and the valve seat fit is not very accurate, it still has better sealing performance. b. After the sealing surface of the ram is worn, the metal pad at the bottom of the spherical top center can be used after replacement, and there is generally no need to surpass and grind the sealing surface, which is the advantage that the single ram and the elastic ram do not have. c. It is suitable for steam, high-temperature oil and oil and gas medium, and is suitable for frequent switching.

d. It is not suitable for medium that is easy to coke. (4) Parallel gate valve a, the sealing performance is worse than other forms of gate valves. b. It is suitable for medium with low temperature and pressure.

c. The processing and maintenance of the sealing surface of the gate plate and valve seat are simpler than those of other forms of gate valves.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, 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.

Summary. Hello dear <>

The fire gate valve is made of stainless steel. The stainless steel gate valve has excellent corrosion resistance and high temperature resistance, and is suitable for fire protection systems with special corrosive media or high temperature environments.

What material is used for the fire gate valve.

Hello dear <>

The fire gate is made of stainless steel. The stainless steel gate valve has excellent corrosion resistance, subpulsion resistance and high temperature resistance, and is suitable for fire protection systems with special corrosive media or high temperature environments.

Stainless steel is a special performance steel, usually said stainless steel is the general term of stainless steel and acid-resistant steel, as the name suggests, stainless steel is not easy to rust, that is, corrosion-resistant steel. I wish you a happy life! Hope mine is helpful to you ha.

Answer]: A The basic performance of fire gate valve includes the following aspects. (1) Aging resistance of rigid non-metallic parts:

The rigid non-metallic parts are subjected to hot air aging and warm water aging and mega width tests, and the rigid non-metallic parts should not be distorted, creeped, cracked or other deformation damage that hinders the normal operation of the device. (2) Sealing performance: When the gate valve plate is in the closed position, the water inlet should be able to withstand the hydrostatic dust pressure twice the rated working pressure for 5min, and there should be no leakage at the sealing parts of the valve.

3) Valve body strength: the gate valve should be able to withstand 4 times the hydrostatic pressure of the rated working pressure, keep it for 5min, the gate should be fully open during the test, and the valve body should be free of leakage, deformation and damage after the test. (4) Handwheel:

The handwheel for gate valves should be of the "spoke and rim" type with no more than 6 spokes, and the wheels should be closed in a clockwise direction. On the rim of the wheel, there should be a clear indication of the bright arrow and the word "off" or the two-way arrow of opening and closing and the words "on" and "off"; The handwheel should be fixed on the valve stem with a lock nut, and the diameter of its outer edge should not be less than the specified value.

Dear, I'm sorry to keep you waiting, I'll answer for you. Fire gate valve is a kind of control valve used in the fire protection system, generally using several materials to vibrate the scale: 1

Ductile iron: Ductile iron is a kind of high-strength, high-toughness cast iron, its strength, toughness, corrosion resistance and other properties are better than ordinary cast iron, is one of the commonly used gate valve materials in fire protection systems. 2.

Stainless steel: Stainless steel has excellent corrosion resistance and high temperature resistance, and is also commonly used to make gate valves in fire fighting systems. Commonly used stainless steel materials are etc.

3.Brass: Brass has good corrosion resistance and thermal conductivity, and the cost is moderate, so it is also commonly used in the production of gate valves in fire protection systems.

4.Cast iron: Cast iron is a commonly used vertical and prudent construction material, its low cost and simple manufacturing process, so it also has a certain application in the fire protection system, but compared with other materials, its strength and corrosion resistance are poor.

In general, the material of the fire gate valve should be selected according to the specific use scenario and needs to ensure its safety, reliability and durability.

Summary. Dear , I'm glad to answer for you. Fire gate valves are generally made of cast iron or copper alloy.

Cast iron fire gate valves have excellent performance in fire prevention, temperature resistance, corrosion resistance, etc., and have low manufacturing cost and long service life, and are often used in fire water supply pipelines. Copper alloy fire gate valves have good performance in terms of strength, corrosion resistance, sealing, etc., but the cost is relatively high, and they are often used in some high-end buildings or equipment.

Dear , I'm glad to answer for you. The cavity fire gate valve is generally made of cast iron or copper alloy. Cast iron fire gate valve has excellent performance in fire prevention, temperature resistance, corrosion resistance, etc., and has low manufacturing cost and long service life, and is often used in fire water supply pipelines.

Copper alloy fire gate valve has good performance in terms of strength, corrosion resistance, sealing, etc., but the cost is relatively high, and it is often used in some high-end buildings or equipment.

What material, standard, model.

There are many models of fire gate valves, according to the requirements and conditions of on-site use, different specifications and models of fire gate valves can be selected, such as Z45X, Z41X, Z43X, Z44X, etc. Among them, the Z45X fire gate valve is one of the more commonly used, which has the advantages of corrosion resistance, ballast resistance, wear resistance, good sealing, etc., and is suitable for various commonly used media and pipeline bionic systems. When purchasing fire gate valves, it is necessary to consider the specific use requirements and environment, and choose the appropriate materials, standards and models.

At the same time, pay attention to the installation, maintenance and replacement of fire gate valves to ensure that they can be used normally in practical applications to ensure fire safety. It is recommended to purchase and use according to the domestic fire protection facilities standards to ensure safety and legality.

Summary. Hello, dear. Fire gate valves are generally made of cast iron.

The valve material of the fire pipeline is generally made of cast iron, but the sealing performance is the rubber sealed valve. For example, rubber soft seal gate valves, soft seal butterfly valves, soft seal clamp butterfly valves and so on. Its valve body and bonnet are cast bronze alloy that meet the relevant standards, and are generally connected by threads;

Hello, dear. Fire gate valves are generally cast iron rulers. The valve material of the fire pipeline is generally made of cast iron, but the sealing performance is the rubber sealed valve.

For example, rubber soft seal gate valve, soft seal butterfly valve, Lingzheng socks soft seal Qingyu clamp butterfly valve and so on. Its valve body and bonnet are cast bronze alloy that meet the relevant standards, and are generally connected by threads;

Hello, dear. Data expansion: Iron-carbon alloy is "cast iron is an iron-carbon alloy with a carbon content that is more sensitive to slip than the general one."

It is a multi-alloy with iron, carbon and silicon as the main components and contains more impurities such as manganese, sulfur and phosphorus than carbon steel. Sometimes, in order to improve the mechanical properties or physical and chemical properties of cast iron, alloying elements with a certain amount of stuffy bonds can also be added to obtain alloy cast iron bridge cover wax. ”

The fire safety valve is the water supply safety valve, which is completely different from the gate valve, and the safety valve is as follows.

Safety valve gate valve is the following gate valve.

The main difference is that the fire equipment supervision department strictly examines the qualified products produced by the qualified certificates.

The opening and closing parts of the fire gate valve are the gate, the direction of movement of the gate is perpendicular to the direction of the fluid, and the gate valve can only be fully opened and closed, and can not be adjusted and throttled. The ram has two sealing surfaces, and the most commonly used mode gate valve has two sealing surfaces forming a wedge, and the wedge angle varies with the valve parameters, usually 50, and 2°52 when the medium temperature is not high' 。The gate plate of the wedge gate valve can be made into a whole, which is called a rigid gate; It can also be made into a ram that can produce a slight amount of deformation to improve its manufacturability and make up for the deviation of the sealing surface angle in the processing process, which is called the elastic ram.

The types of fire gate valves can be divided into wedge gate valves and parallel gate valves according to the sealing surface configuration, and the wedge gate valve can be divided into: single gate type, double gate type and elastic gate type; Parallel ram type gate valves can be divided into single ram type and double ram type. According to the thread position of the stem, it can be divided into two types: open rod gate valve and dark rod gate valve.