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General Valve
Valves are ubiquitous in the national economy. They are closely related to production, construction, national defense and people’s life.
General Valve is installed in various pipeline systems. As a pipeline control accessory, it is mainly used to change the channel section to control the fluid pressure. It is the particularity of valves that determines the complexity of valves. Therefore, the type and quantity of valves are incomparable with any mechanical product.
Frequently asked questions
QWhich media is the check valve applicable to?
It is suitable for clean media, not media containing solid particles and high viscosity.
QWhat’s structure of V-ball valve?
V-type ball valve is a rotary ball valve with variable notch area to adjust fluid flow. It adopts a spring loaded movable valve seat structure. The valve seat and the ball will not get stuck or separated. It has reliable sealing and long service life. When fully opened, the flow capacity is large, the pressure loss is small, and the medium will not deposit in the valve body cavity.
QWhat’s Structure of three-way ball valve?
T Type and L Type.
QWhat’s structural characteristics of wafer check valve?
The structure is short in length, small in volume, light in weight, fast in closing the valve plate, and low in water hammer pressure. The flow passage is smooth, the fluid resistance is small, the valve disc is short, and the closing impact is small.
QWhat’s Sealing principle of check valve?
The valve disc rotating around the fixed axis can be automatically opened and closed by the medium force (or by increasing the auxiliary external force).
QWhat’s main purpose of check valve?
Prevent media from flowing back.
QWhat’s main features of check valve?
Installed at the outlet end of the pump or compressor.
QWhat’s function of Y-type filter?
The filter is an indispensable device in the pipeline system for medium transmission. Its function is to filter the mechanical impurities in the medium, so as to protect the fittings on the equipment pipeline from wear and blockage.
QWhat’s flow characteristics of V-ball valve?
The flow characteristics of the V-ball valve are approximately equal to 100%, with a wide adjustable range and a maximum adjustable ratio of 100:1
QWhat’s features of Y-type filter?
Small size, fine filter hole, small resistance, high efficiency, convenient installation and maintenance, low cost, to meet the needs of various pipelines.
QWhat’s applicable working conditions of basket filter?
It is widely used in petroleum, chemical industry, chemical fiber, medicine, food and other industries.
QWhat tooling is required if the valve stem is longer?
If the valve rod is long, tooling and tool holder shall be used
QWhat tooling are required for the valve body and gate plate of the gate valve?
The tools required for the valve body of the gate valve are: four jaw chuck, seam locating disc, inclined tire seam locating disc, drilling template, V-shaped locating pressing plate; Tools required for ram: four jaw chuck, single and double angle inclined tire.
QWhat is the structure of the floating ball valve?
The ball has no supporting shaft and is clamped by two valve seats in a "floating" state.
QWhat is the structure of triple -offset butterfly valve?
Offest 1: The shaft is offest behind the seat axis to allow complete sealing contact around the entire seat.
Offest 2: The shaft center line is offset from the pipe and valve which provides interference free opening and closing of the valve.
Offest 3: The seat cone axis is offset from the shaft center line to eliminate friction during closing and opening and to achieve uniform compressive sealing around the entire seat.
QWhat is the sealing principle of the globe valve?
The sealing of the globe valve is mandatory. It relies on the axial force of the valve stem to act on the valve disc, generating enough force to make the sealing ratio reach the required specific pressure, so as to achieve sealing.
QWhat is the sealing principle of gate valve?
Regardless of its specific structure, the basic sealing principles of gate valve can be divided into automatic sealing, unilateral forced sealing and two-way forced sealing
QWhat is the main purpose of the valve?
It is mainly used for installation in various pipeline systems, as a pipeline control accessory, to change the channel section to control fluid pressure, flow and direction, such as cutoff, regulation, check, diversion, safety, decompression, etc.
QWhat is the main purpose of the globe valve?
It is used to cut off the medium in the pipeline
QWhat is the function of the T type three-way ball valve?
Used for media diffluence, confluence and flow direction switching. T-type tee can connect three channels or two of them.
QWhat is the function of the L type three-way ball valve?
It is used for switching the flow direction of media, and can connect two mutually perpendicular channels.
QWhat is an unsealed butterfly valve?
That is, the butterfly valve that cannot be fully sealed when closed is usually used as a regulating valve on the pipeline.
QWhat is advantages of triple eccentric butterfly valve?
The utility model eliminates the abrasion between the sealing surfaces, maintains the integrity of the sealing surfaces and has a long service life. It eliminates the binding when the valve seat and valve disc are wedged and combined, ensuring zero leakage, fluid efficiency and reducing maintenance costs.
QWhat is a swing check valve?
The swing check valve adopts a built-in rocker swing structure. All the opening and closing parts of the valve are installed inside the valve body without penetrating the valve body. Except for the sealing gasket and sealing ring used at the middle flange, there is no external leakage point on the whole, so as to eliminate the possibility of valve leakage
QWhat is a sealed butterfly valve?
That is, the butterfly valve that can ensure sealing when closed is used for cutting off on the pipeline.
QWhat is a basket filter?
The filter is a small device for removing a small amount of solids in the liquid, which can protect the normal operation of compressors, pumps, other equipment and instruments. It also improves product purity. Small equipment for purifying gas.
QWhat are the structural features of the V-ball valve?
There is a shearing effect between the V-type notch ball and the metal valve seat. When the medium contains fibers, solid particles or slurry, the V-type notch ball valve will not be stuck, and good sealing performance will still be guaranteed. The eccentric ball valve and ball structure can reduce self wear.
QWhat are the main types of valves?
The main types of valves are: gate valve, globe valve, check valve, ball valve, butterfly valve, plug valve, diaphragm valve, safety valve, drain valve, throttle valve, pressure reducing valve, regulating valve and special valve;
QWhat are the main characteristics and uses of butterfly valves?
Simple and compact structure, small volume, light weight, convenient and fast operation, reliable sealing, long service life, especially after breaking through the temperature range in structure and material selection, it can be applied to various media working conditions.
QWhat are the main characteristics and purposes of the gate valve?
It can be applied to the working conditions of various parameters. At the same time, the gate valve also has the advantages of small flow resistance, less effort in opening and closing, unrestricted medium flow direction, and the upper sealing structure is conducive to the prosperity and protection of the packing.
QWhat are the general tooling for processing valve parts?
Four jaw chuck, seam locking locating disc, inclined tire seam locking locating disc, drilling template, V-shaped locating pressing plate, sleeve mould, single and double angle inclined tire, etc;
QWhat are the differences between process and procedure?
The technological process includes process, installation, station and step; Working procedure refers to a part of the technological process that one (or a group of) workers continuously complete for one or several workpieces on a machine tool (or a fixed work place).
QWhat are the characteristics of the processing technology of valve body, valve stem and gate?
Machining process characteristics of valve body: most of the main machining surfaces are rotary surfaces suitable for turning, such as flanges, inner holes and sealing surfaces. However, the three end flanges have mutual position accuracy requirements, the sealing surface of valve seat has position accuracy requirements, and the guide rib parts need to be machined on the slotting machine or planer; Processing characteristics of valve stem: rotating body parts, with length greater than the diameter, have cylindrical surface and external thread, and have sealing conical surface. There is coaxiality requirement between each cylindrical surface and conical surface; Ram processing features: rotating body parts have sealing surface at the lower end, T-shaped groove at the upper end, and the two sealing surfaces have position reading requirements;
QWhat are the basic structures of ball valves?
Floating type and Trunnion type.
QThere are many kinds of butterfly valves. According to the product structure and use, which two categories can they be divided into?
Sealed butterfly valve and unsealed butterfly valve
QThe sealing structure of sealed butterfly valve can be divided into forced seal and self pressure seal. What is the difference between the two seals?
Forced sealing: the butterfly disc and the seal seat are sealed by the external force.
Self pressure sealing: after the butterfly disc is closed in place under external force, the sealing seat and the butterfly plate are tightly contacted by the medium to seal
QMain purposes of ball valve?
Cut off and split flow (three-way and four-way ball valves) and adjust (V-type ball valves).
QMain purpose of ball valve?
Cut off and adjust.
QMain features of globe valve?
Simple and compact structure, good sealing performance and high pressure resistance; Small opening height and short opening and closing time; The sealing surface is not easy to wear and scratch; Long service life; The upper seal can protect the packing; However, it has large flow resistance, large opening and closing torque, small scope of application and small caliber.
QMain features of ball valve?
Small flow resistance, quick and convenient switch, small size, light weight, good sealing and long service life; High safety and reliability; It is convenient for maintenance, and it can self relieve pressure and sweep the line through the ball.
QIs the bellows gate valve a top mounted valve stem nut?
Yes, the upper mounted valve stem nut keeps the valve in the open position. Even if the handwheel is removed, the valve stem and valve plate will not fall
QHow many types of gate valves are there?
It is mainly divided into two categories, parallel gate valve and wedge gate valve.
QHow many degrees of inclined platform should be used to process the ram with a 5 degree inclined plane?
10 degree ramp should be used
QHow does the globe valve work?
The closing element (disc) moves along the center line of the valve seat under the drive of external force, thus completing the opening and closing of the valve.
QHow does the gate valve work?
Through the relative movement of the valve stem, it drives the closing piece (disc) to move in a direction perpendicular to the pipeline axis, so as to open and close the valve
QHow does the butterfly valve work?
The butterfly valve is closed as a disc. It rotates with the support shaft of the valve body through external force to open and close the valve.
QHow does the ball valve work?
The external force acts on the upper end of the valve stem to drive the hoist (ball) to rotate 90 °around the center line of the valve body to complete the function of cutting off the valve section or changing the flow direction of the medium.
QFull bore and reduce structure of ball valve?
The channel inner diameter of full bore ball valve is consistent with the inner diameter of pipeline, which not only minimizes fluid resistance, but also facilitates pipeline cleaning.
The fluid resistance of necked bore ball valve is much less than that of the globe valve with the same caliber while its weight is 30% lighter than ball valves with the same caliber.As a result,it can effectively reduce both the production cost and price,and is relatively widely used.
QFor the lifting valve stem of bellow gate valve, is the valve stem connected with the gate plate by T-groove?
Yes, the T-type head of the valve stem is integrally forged to ensure sufficient connection strength.
QExplain the meaning of standard codes GB/T, JB/T, SH, ASTM, ASME, ANST, BS, JIS?
GB/T: National Recommended Standards
JB/T: Recommended Standards for Machinery Industry
SH: Sinopec Standards
ASTM: American Society for Testing and Materials
ASME: American Society of Mechanical Engineers
ANST: American National Standard
BS: British National Standards
QDoes the ball valve have fire safe seat sealing function?
Yes, according to the customer's requirements, the ball valve can be designed as a fire-resistant structure. In case of fire and the seal ring is damaged, every sealing part part of the ball valve can form the structure of metal to metal hard seal, which can prevent the spreading of both the media and fire.
QDoes the ball valve have blow-out proof stem ?
Yes, the valve stem is downloading,with its inverted sealing structure with sealing gasket. The force of inverted sealing structure will increase while the medium pressure in the valve cavity increases,to ensure the sealing effect of the stem.In case of abnormal pressure increasing of the valve cavity,the stem won’t be impacted out.The filler is designed with proper V shaped structure,which can effectively convert the medium pressure inside the valve cavity and the locking force of outer gland into the sealing force of stem.
QDoes the ball valve have an automatic pressure relief structure?
Yes, when the liquid medium trapped in the valve chamber is vaporized due to the rise of temperature and the pressure in the middle chamber rises abnormally, the medium in the middle chamber pushes the valve seat backward by its own thrust to automatically relieve pressure, so as to ensure the safety of the valve body. For the double seal valve, in order to ensure the safety of the valve, the discharge valve body is added to discharge the accumulation in the middle chamber.
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