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Cast iron valve CO.,LTD, YU HUA Road BOTOU CITY HEBEI, Cangzhou (2026)

17/09/2025

Valve Type Primary Function Common Applications in Petroleum Industry
Gate Valve
On/Off Isolation
Used where straight-line flow and minimum restriction are needed. Common in wellheads, pipelines, and tank farms. Not for flow regulation.

Ball Valve
Quick On/Off Isolation
Excellent shut-off capability. Used in offshore platforms, pipeline scraper traps (launchers/receivers), and fuel handling systems. Fire-safe designs are critical.

Globe Valve
Flow Regulation / Throttling
Precisely controls flow rate. Used in cooling water systems, fuel oil systems, and chemical injection points. Higher pressure drop than gate valves.

Check Valve
Prevent Backflow
Allows flow in one direction only, automatically closing to prevent reverse flow. Essential for protecting pumps and compressors (pump/compressor discharge).

Butterfly Valve
On/Off & Regulation
Compact, lightweight, used for large diameter lines where tight shut-off isn't critical. Common in water flood systems, cooling water circuits, and product blending.

Plug Valve
On/Off & Diverting Flow
Similar to a ball valve but with a cylindrical plug. Used for diverting flow in pipelines and for on/off service with abrasive fluids.

Safety Relief Valve
Overpressure Protection
Critical for safety. Automatically opens at a set pressure to vent excess fluid and protect vessels, pipes, and equipment from rupture. Mandatory on pressurized tanks, reactors, and boilers.

04/04/2025

Brief Introduction to Functions of Butterfly Valves
Butterfly valves, featuring unique designs, serve various purposes in fluid systems.
1. Flow Shut - off
The valve plate rotates 90° to block fluid flow quickly, widely used in emergency shut - off scenarios.
2. Flow Regulation
By adjusting the valve plate's angle, it precisely controls fluid flow, applicable in HVAC and industrial systems.
3. Pressure Surge Buffering
During closure, it reduces fluid velocity, protecting pipelines from water hammer damage.
4. Sealing
Made of valve plates, seats and proper seal materials, it prevents fluid leakage bidirectionally.
5. Throttling
Reducing the flow area, it lowers fluid pressure, suitable for high - rise building water supply.
6. Check Function
Equipped with special structures, it stops fluid backflow, ensuring system stability.
Butterfly valves are crucial for safe, stable and efficient operation of fluid systems.

28/03/2025

What is a lug butterfly valve?
1. During pipeline installation, bolts fix both-side flanges separately, preventing bolt extrusion on the valve body and seal—benefiting seal life.
2. Lugs enable easy installation at discharge points.
3. Unlike wafer connections (long bolts cause creep/leakage by squeezing the valve body), lug valves use shorter bolts.
**Difference from flanged butterfly valves**: Flanged types have through bolt holes (clamped by flanges). Lug valves use full-thread studs: long bolts for through holes, short ones for internal thread holes installed on both sides.

21/03/2025

globe valve: cut off or connect the pipeline medium. Such as stop valve, gate valve, ball valve, plug valve, etc.;

Regulating valve: Adjust the pressure or flow of the medium. Such as pressure reducing valve, regulating valve;

Check valve: prevent media backflow. Like a check valve.

Distribution valve: change the flow of the medium, play a distribution role. Such as three-way c**k, three-way stop valve, etc.

Safety valve: When the pressure exceeds the limit value, the excess medium is discharged to ensure the safety of the equipment. Such as safety valves, emergency valves;

Air drain valve: retain gas, remove condensate, such as trap valve.

18/03/2025

The working principle of the trap valve:
The steam trap is installed between the steam heating equipment and the condensate return manifold. When driving, the barrel is on the bottom and the valve is fully open. After entering the trap, the condensate water flows to the bottom of the barrel, fills the valve body, and completely immerses the barrel body. Then, the condensate water is discharged to the return water collector through the fully opened Fujian door. Steam also enters the trap from the bottom of the barrel and occupies the top of the barrel body, creating buoyancy. Slowly raise the barrel and gradually move the lever towards the seat until the valve is completely closed. Air and carbon dioxide gas pass through the exhaust holes in the barrel body and collect at the top of the trap. The steam discharged from the vent will condense due to the heat dissipation of the trap. As the incoming condensate begins to fill the barrel, the barrel begins to exert a pull on the lever. As the condensation level continues to rise, the force generated increases until the pressure difference can be overcome and the valve is opened. As the trap valve begins to open, the pressure difference acting on the disc decreases. The barrel will drop rapidly, leaving the valve fully open. The non-condensable gas that accumulates on the top of the trap is discharged first, and then the condensed water is discharged. When the water flows out of the barrel, the dirt flows out of the trap. At the same time as the condensate is discharged, steam begins to enter the trap again, and a new cycle begins again

17/03/2025

Valve common failure and preventive measures
Stuffing box leakage
This is one of the common faults in valve operation. Possible causes include the incompatibility of packing and working medium, improper filling method, insufficient valve stem accuracy, valve stem corrosion or bending, and excessive operation.

Closure leakage
Closure leakage is usually divided into two categories: sealing surface leakage and seal root leakage. The possible reasons are poor grinding of sealing surface, lax coordination of sealing ring with seat or valve, and insecure connection between valve and valve stem. In addition, too fast closing, improper material selection, use of stop or gate valves as regulating valves, and media cooling can also lead to leaks.

Valve stem lift failure
Valve stem lifting failure may be caused by thread damage, bearing wear, poor lubrication or foreign matter stuck. In addition, if the operation is improper or the valve itself has a manufacturing defect, it may also lead to the valve stem lifting failure.

Excessive operation causes thread damage

14/03/2025

Butterfly valve refers to a disc disc, revolving around the valve shaft to achieve the opening and closing of a valve, mainly used in the pipeline for cutting and throttling. The opening and closing part of the butterfly valve is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjusting. The butterfly valve is usually less than 90°, the butterfly valve and the butterfly rod itself have no self-locking ability, in order to position the butterfly plate, the worm gear reducer should be installed on the valve stem. The use of worm gear reducer can not only make the butterfly plate self-locking ability, so that the butterfly plate stops in any position, but also improve the operating performance of the valve.

10/03/2025

From the practical application point of view, the types of valves commonly used by water companies mainly include globe valves, regulating valves and check valves. The globe valve is mainly used to cut off or connect the medium in the pipeline. It has the characteristics of simple structure, good sealing performance and easy operation. It is one of the most common valves in the tap water system. The regulating valve is used to adjust the flow and pressure of the pipeline medium, which usually has a large flow range and good regulating performance, and can meet different water supply needs. The check valve is mainly used to prevent the backflow of the medium in the pipeline and ensure the normal operation of the water supply system, and its importance is self-evident.
In addition, with the progress of science and technology and the continuous upgrading of the water system, some new valves have gradually been applied, such as electric two-way valves and magnetic lock valves. These new valves are more automated and easier to operate, helping to improve the efficiency and safety of the water supply system.

06/03/2025

Gate Valve:
Gate valves are one of the most common valves, often used to control large flows of liquids or gases. It has the characteristics of simple structure, quick opening and closing, good sealing performance, and is widely used in water conservancy projects such as water pipes, sluices, reservoirs, etc. Gate valve is suitable for fully open or fully closed state, not for regulating flow.
Butterfly Valve:
Butterfly valve is a lightweight, simple valve, usually used for medium and low pressure liquid or gas regulation. It opens and closes by rotating the disc so it can open and close quickly. Butterfly valve has the advantages of small size, light weight, good sealing, etc., and is often used in water conservancy projects for large water pipe flow regulation.
Ball Valve:
Ball valve is a ball as a closing part of the valve, with fast opening and closing, good sealing, corrosion resistance and other characteristics. Ball valves are widely used in hydraulic engineering pipeline systems to control the flow of liquids or gases. Because of the good sealing performance of the ball valve, it is often used in situations with strict fluid requirements.
Check Valve:
Check valve is a valve used to prevent the backflow of fluid, which is often used in hydraulic engineering, sewage treatment and other fields. The check valve works by automatically closing the valve through fluid pressure, preventing the flow from reversing. It has the advantages of simple structure, quick opening and closing, and can effectively prevent the reverse flow of the pipeline system.

04/03/2025

Handle type butterfly valve and turbine type butterfly valve how to choose?
The handle butterfly valve drives the valve plate by directly operating the handle, which is simple in structure, small in size, light in weight, and easy to install and carry. The valve opens and closes quickly and is especially suitable for situations requiring quick opening and closing. At the same time, the sealing performance of the handle butterfly valve is good, which can achieve zero leakage and meet the application with high sealing requirements. However, when the pressure in the tube is high, the handle operation may be more laborious. When the pipe diameter is less than DN200, the handle butterfly valve is a better choice.

In contrast, the turbine butterfly valve drives the valve plate through the turbine transmission, which is more labor-saving to operate. This kind of valve usually has better sealing performance, especially in the environment with higher switching frequency, and the service life is often longer. In addition, the turbine butterfly valve is suitable for larger calibers (greater than DN200) pipe systems to meet the control needs of large flow media. However, it should be noted that the switching speed of the turbine butterfly valve is relatively slow.

03/03/2025

Which is durable, ball valve or gate valve?
In general, the durability of ball valves is usually superior to gate valves, mainly due to the structural design of ball valves. The sealing performance between the ball and the seat of the ball valve is better, and the contact area between the ball and the medium during the rotation is small, which reduces the possibility of wear. In addition, the internal structure of the ball valve is relatively simple and easy to maintain, which further extends its service life.
In contrast, the durability of gate valves is affected by a number of factors. The gate valve is lifted vertically in the valve body, and the friction with the seat is relatively small when it is opened and closed, but in the long-term half-open and half-closed state, the gate may be worn due to the erosion of the medium. In addition, if the sealing surface of the gate valve is made of rubber material, it may also reduce the durability due to fluid corrosion. However, for clean media and stable operating conditions, the durability of gate valves is also considerable.
In practical applications, the choice of ball valve or gate valve needs to be determined according to the specific use scenario and needs. For example, in media containing solid particles, the durability advantage of ball valves is more obvious; In the need for high reliability and safety, such as drinking water pipelines or chemical raw material pipelines, gate valves are more suitable.

01/03/2025

Under what circumstances cannot butterfly valves be used?
1. Occasions with high pressure requirements: compared with gate valves, globe valves, etc., butterfly valves have poor sealing performance, especially in high pressure environments, which are prone to leakage. Because of
Therefore, in systems requiring extremely high pressure sealing, such as high pressure steam lines, high pressure water installations or hot water systems, butterfly valves may not meet the requirements.
2. High temperature environment: the sealing material of butterfly valve is usually unable to withstand too high temperature. Under high temperature conditions, the elastic seat material may deform and age, resulting in the valve
The sealing performance decreases and even does not work properly. Therefore, in high temperature environments, such as hot water pipes, butterfly valves may not be the best choice.
3. Scenarios with high requirements for fluid regulation performance: Although butterfly valves can be used for flow regulation, their flow regulation range and accuracy are possible compared to specialized regulating valves
Limited. In scenarios where precise control of fluid flow is required, such as fine flow regulation in chemical production, butterfly valves may not meet the requirements.
4. Media containing solid particles: the sealing surface of the butterfly valve has large mechanical wear and is not suitable for media containing solid particles. In the treatment of mud, sewage and other solids
In pipes with granular media, butterfly valves may fail due to wear and tear, affecting the normal operation of the entire system.

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