What Are The Advantages of Forged Steel Gate Valve?

Forged steel gate valve is the closing piece along the center line of the vertical movement of the valve, forged steel gate valve in the pipeline for the main cut off. Forged steel gate valve is a very wide use of a valve. Forged steel gate valve has two sealing surface. So, what are the advantages of forged steel gate valve?

The fluid resistance is small, opening and closing the required external force smaller; medium flow is not restricted. When we open fully, the sealing surface by the working medium erosion than the cut-off valve is small; shape is relatively simple, casting process is better. Forged steel gate valve fluid resistance is small, forged steel gate valve body shape is simple, short structure length, wide range of applications. Forged steel gate valve is placed vertically in the valve body, and check valve flap is placed horizontally inside the valve body, and thus the length of the structure is shorter than check valve. forged steel gate valve body medium channel is straight, so the fluid resistance is small.

How to Maintain Forged Steel Gate Valve?

Forged steel gate valve is suitable for working temperature -29 ~ 425 ℃ (carbon steel) or -29 ~ 500 ℃ (stainless steel) , used to cut off or turn on the media in the pipeline, especially on oil pipelines. In daily use, maintenance work is also particularly important, the maintenance of forged steel gate valve is also a way to improve operating efficiency. The following is forging steel gate valve maintenance matters.

1.Forged steel gate valve maintenance need to prevent the electric head and its transmission in the water, especially in the rainy season. The water will make transmission or drive sleeve rust, it will affect the normal operation of the equipment.

2.If the forged steel gate valve often switch, lubricate at least once a month..

3.Forged steel gate valve often overlook the problem of grease. 

4.Clean of the forged steel gate valve regularly, to prevent entering the debris, affecting the normal operation of equipment.

5.the valve shaft parts have sliding sleeve or packing, it is necessary to maintain the lubricating state to reduce the frictional resistance during operation.

Cast Steel Ball Valve Partition

Cast steel ball valve opening and closing pieces driven by the stem, and rotates about the axis of the valve stem. Mainly suitable for containing fiber, small solid particles and other media. Cast steel ball valve switch is light, size is small, can be made of large diameter, reliable sealing, simple structure, easy maintenance, sealing surface and spherical surface stay in a closed state, not easily eroded by the media. 

Cast steel ball valve divided by three types according to structure, they are the floating ball valve, the fixed ball valve and the elastic ball valve. 

Floating cast steel ball valve has simple construction, good sealing, floating ball valve is widely used in low-pressure cast steel ball valve. The ball of fixed ball valve is fixed, after compression does not move. suitable for high-pressure and large diameter valves. The ball of elastic cast ball valve is elastic. This valve is suitable for high temperature and high pressure medium.

Valve Maintenance Methods

First need to keep the valve clean, transmission thread should be lubricated periodically, when a fault is noted, should immediately stop using, once found should be promptly cleaned. Packing gland bolts should be tightened evenly and should not be pressed into a crooked state, to avoid bumps impede movement or cause valve leakage. When we install the vale, valve can be directly connected to pipeline by connecting means. 

In addition, when use the ball valves, globe valves, gate valves, only for fully open or fully closed, not allowed to do with regulating traffic to avoid sealing surface washed. Gate Valve and shut-off valve has a threaded sealing device, hand wheel swing up to the uppermost position and tighten. We close the ball valve, globe valve and gate valve by hand wheels to prevent damaging valve parts. 

 

The Relationship between Cast Iron Butterfly Valve and The Flow

The relationship between the flow and cast iron butterfly valve is basically a linear proportional change. If used to control the flow, its flow characteristics and piping flow resistance is also closely related, if the installation of two pipe valve diameter and form are the same, pipeline loss coefficient is different, the valve flow will be very different.
Electric butterfly valve must be visually inspected before the installation, valve nameplate should be consistent with the national standard "General Valve Logo" GB12220 requirements. For working pressure greater than 1.0MPa, play the role of cutting off, be carried out before the strength and tight performance test before the installation. When we carry out strength test, the test pressure is 1.5 times of the nominal pressure, duration time is not less than 5min, valve shell, packing should be no leakage, which is qualified. 

Cast Iron Butterfly Valve Core Material

Determine cast iron butterfly valve core material must be related to the media, can be considered from the following aspects:

If it is non-corrosive media, such as water, you can use 45 other steel or other structural steel.

If it is the corrosive medium, we must know the nature, temperature, concentration and other factors of corrosion, under normal circumstances. Acidic environment must know the nature of acid, temperature, PH value of concentration, etc., or even the choice of stainless steel corrosion will occur. If it work in alkaline environment, room temperature can use carbon structural steel, high temperature, high concentrations can use stainless steel.

Characteristics of Cast Steel Ball Valve

1. Metal seal ball valve with eccentric structure, in the closing process, the valve seat and ball cold between the seal can rapidly increase the pressure to ensure a reliable seal sealing.

2. The metal hard-seal floating ball valve adopts the elastic loading structure, which ensures the contact between the ball sealing surface and the valve seat sealing under the normal closing condition, suitable for small and medium-sized high-temperature use occasions.

3. Cast steel ball valve can be used in both directions, and difficult to deposit dirt in the cavity, according to user operating conditions, can also be set in the middle chamber outfall.

4. Ball surface is used special hardening, ensure that the seal between the hardness of the appropriate difference, particularly suitable for solid particles and abrasive media. Other sealing materials use flexible graphite, metal wound gaskets,  it can be used for high temperature and high pressure conditions, and a fire-resistant features.

 

Structural Characteristics of Bellows Sealed Globe Valve

Bellows sealed globe valve used bellows seal design, completely eliminates the  shortcomings of common valve, such as stem packing seal aging quickly leaking, improve the use of energy efficiency, increase production safety, reduce maintenance costs and frequent maintenance, provide a clean and safe working environment.

1.Double seal design (bellows + packing), if the bellows fails, the stem packing will be avoided.

2.Reasonable structure, reliable sealing, excellent performance, handsome appearance.

3.No fluid loss, reduce energy loss, improve plant safety.

4.Wear-resistant, corrosion-resistant, anti-friction performance, long service life.

5.Globe valve stem and surface nitriding treatment, a good anti-corrosion and anti-friction properties;

6.Stem lift position indication is more intuitive.