Gnee steel group is a supply chain integrated enterprise including steel plate, coil, profile, outdoor landscape design and processing. Founded in 2008, with 5 million RMB registered capital, Gnee has made impressive progress and development in steel market with Gnee People more than 15 years hard fighting. At present, the total investment amount reaches 30 million RMB, workshop area more than 35000㎡, with over 200 employees. Gnee is becoming the most professional international steel supply chain company in China central plains with explicit strategic framework, integrated governance structure, firm management foundation, abundant fund and human power.
Why Choose Us?
Our products
GNEE Group specializing in the manufacture and distribution of high quality valves and fittings for a wide range of industrial applications including water supply, sewage systems, oil and gas, and marine treatment.
Sales market
GNEE valves have been exported to more than 150 countries around the world, and every year more than 50 customers visit the GNEE Group and order more than 30,000 pieces of valves.
Our team
Established in 2008 with a registered capital of RMB 5 million, GNEE Group At present, the company has a total investment of 30 million yuan, a plant area of more than 35,000 square meters and more than 200 employees.
Customer service
GNEE Group always puts product quality and customer needs first, and strives to provide better services to each of our customers. We follow the latest standards and focus on management, technology and process innovation. With a mature sales service system, GNEE Group insists on providing one-stop service to every customer.
Cryogenic gate valve is an opening and closing device used for fully opening and fully closing. The opening and closing part of the low-temperature gate valve is the gate plate. The movement direction of the gate plate is perpendicular to the direction of the fluid.
Cast steel gate valves are used in body pipelines as regulating and stopping devices used in the product. Cast steel gate valve opening and closing member is the gate, the movement direction of the gate is perpendicular to the direction of the fluid, the gate valve can only be fully open and fully closed, can not be used for regulating and throttling.
Size: 2''~48''
Connection: Flanged
Material: WCB/SS/Casting
Application: Oil, Water, Gas, Acid
Cast Iron Non Rising Stem Gate Valve
Diameter: DN50-DN600
Pressure: 1.0MPA-2.5MPA
Temperature: -20ºC-150ºC
Size Range: NPS2~NPS24,DN50~DN600
Nominal Pressure: Class 150 /PN10/PN16
Applicable Temperature: 0~200ºC
Size: DN40-DN600
Design standard: GB/T 12232-2005 DIN3352, EN593, MSS SP-67
Pressure standard: GB/T 13927-1992, API598
Size: 2"-48" DN50-DN1200
Connection mode: Flange
Pressure ranking: PN6/10/16,ANSI Class125/150
Forged Steel Handwheel Gate Valve
Size: 1/2''~2'' ( DN15~DN50)
Port: Full Port
Working Pressure: 150LB~1500LB
Manual Lug Type Knife Gate Valve
Specification: DN50 to DN1200
Standard Flange Connection: DIN PN10, ANSI B16.5 Cl#150
Design Standard: MSS SP-81
What is Wedge Gate Valve?
A wedge gate valve is a type of valve that has the capability of sealing in a fluid flow system. It has been developed with the aim of providing maximum resistance to wear and tear. This valve can be installed in a wide range of applications, such as sewage, water, and other working mediums. The valve can also be used in low-temperature and high-pressure environments.
The main parts of these valves are the bonnet, wedge halves, seat, and stem. The wedge halves are coupled together with springs. These springs boost the load at lower pressures.
The quick reversing of a flow during shutting down procedures, a phenomenon known as "water hammer", is not quite usual in gate valves due to the slow opening-closing movement.
Face to face dimension can be really small with some gate designs due of the nature of the movement of the disc mechanism. This can be quite useful in some piping designs limited by the available space.
Once in full open position, the resistance of the internal channel of the body to the flow is very low because it keeps a straight line, so turbulences generated are minor than in other types of valve designs.
Opening and closing the valve requires a minor effort due to the movement of the mechanism, that is not directly against the flow, like in some other valve designs.At high pressures, friction of the disc against its guiding, can be compensated with a bypass.
Wedge gate valves are easy to install, because both sides are symmetrical, without a predefined flow direction.This fact reduces error factors during the assembly of the pipeline system or maintenance procedures.
Less complex manufacturing implies higher reliability and lower maintenance.
Wide application range, because gate valves are quite versatile, and can be used in oil, steam, water, high density liquids and other media, including granular solids.
Gate valves have a great sealing performance favored by the flow pressure, that helps keeping a tight union between the gate and the seat.
Types of Wedge Gate Valve
The solid wedge is a single-piece solid construction. It does not compensate for changes in seat alignment due to pipe end loads or thermal fluctuations. As such it is most susceptible to leakage. Except for NPS 2 (DN 50) and smaller, solid-wedge discs are generally not recommended for use in applications having temperatures in excess of 250 deg F (121 deg C). Solid-wedge gate valves are considered the most economical. Almost all small, NPS 2 (DN 50) and smaller, gate valves are solid-wedge gate valves. Solid-wedge gate valves are generally used in moderate to lower pressure-temperature applications. It is common practice to use cast iron or ductile iron solid-wedge gate valves in cold or ambient water lines.
The flexible wedge is also one-piece construction like a solid wedge, but areas behind the seating surfaces are hollowed out to provide flexibility. This construction compensates for changes in seat alignment for improved seating while maintaining the strength of a solid wedge in the middle. This design offers better leak tightness and improved performance in situations with potential for thermal binding.
The split wedge consists of two-piece construction which seats between the tapered seats in the valve body. The two pieces of split wedge seat flat against the valve seats as the stem is moved downward, and they move away from the valve seats when the stem is pulled upward.
Components of Wedge Gate Valve
Actuator
The actuator is the component that operates the valve. It is usually a manual handwheel or electric, hydraulic, or pneumatic actuator. For the manual actuator, the valve operator applies rotary force on the handwheel to either start or stop fluid flow.
Stem
Stem is a threaded component that connects the actuator to the wedge disc. The stem is meant to transmit power from the actuator to the valve disc to open or close fluid flow. When the stem moves upwards, it opens fluid flow; when it moves downwards, it stops the fluid flow. Wedge gate valve manufacturers produce the stem from high-strength metals such as stainless steel and carbon steel to ensure the high strength needed to operate the valve, especially for high-pressure applications.
Disc
The disc is the component that is connected by the stem. It can start or stop the fluid flow from the actuator via the stem.
Seat
Wedge gate valve manufacturers design the valve with two seats. The seat is a component that seals the valve disc to the valve body. The seats are made as rings or integrated into the valve body. They are either resilient or metallic. The resilient seats are made from soft materials like rubber or plastic and used where the valve is meant for low temperatures below 65o C. The metallic seats can withstand high temperatures, and thus they are suitable for temperatures above 65oC.
Valve body
The valve body is an outer part of the valve that houses the valve disc and the seats. Wedge gate valve manufacturers design the body from high-strength materials like stainless steel and carbon steel to ensure the body is strong enough to withstand high pressure and impact damage. The valve inlet and exit ports are made on the valve body.
Bonnet
The valve bonnet is usually mounted on top of the valve body. It is meant to cover the opening of the valve body and internal parts such as the stem and the valve packing. The use of welding, bolts, threads, or pressure seals connects the body and bonnet. Wedge gate valve manufacturers produce the bonnet and the body from the same material to enhance uniformity and also to ensure that the valve withstands high fluid pressure.
Packing
Packing is a string sealant that prevents fluid leakage between the valve stem and bonnet. It also helps to control the entrance of contaminants and solids into the gate valve.
When installing a gate valve assembly, there are some important tips to follow to ensure the components are safe and functional. Some of these include:
Inspect components such as the gate, seat, and valve material to ensure there are no defects prior to installation.
Ensure that welding work is complete and the weld area contains no residue and other debris. Also, check that the flanges have cooled to ambient temperature before installation using the appropriate gaskets.
In addition, there should be no warpage or misalignment between the flange and gate valve. If the valve is large, there may be a need for some structural support to reduce the load on the pipe assembly.
Adjust the two flanges to allow for enough space to slip the valve in or out for service, then carefully install the spacing bolts. This should be done in a way that the bottom of the valve rests on the bolts to prevent the valve from falling through.
Tighten the bolts in stages so an even pressure and a proper seal exists between the flanges, valve, and gasket.
Finally, lubricate and operate the valve several times and check the stability of the assembly.
How to Maintain Wedge Gate Valve
Check whether the wedge gate valve is properly closed, whether there are foreign matters on the sealing surface, and whether there is internal leakage on the sealing surface. If allowed, the inspection result of the wedge gate valve is to switch, otherwise the sealing surface is damaged and requires maintenance.
If there is a fault, it is necessary to maintain the wedge gate valve. Wedge gate valves have a safe discharge port that allows cleaning of components, replacement of damaged packing and gaskets, modification of sealing surfaces, and readjustment of discharge pressure. The value is less than 1. Double the pressure. After maintenance, the wedge gate valve cannot resume operation until it passes the hydrostatic test.
Wedge gate valves should be regularly inspected and maintained, and corrosion should be strictly prevented. The equipment should always be in good condition.
Fill the drain with the wedge gate valve and verify that the cover is loose and has been pressed again. Wedge gate valves have sealing rings, but it is not recommended to use pressure instead of packing.
If the intermediate flange leaks, check whether the fixing bolts are loose. If not, tighten them evenly again; "If leakage, gasket damage, aging, or even the sealing surface may be damaged, wedge gate valves should be repaired and replaced with gaskets, or the sealing surface should be repaired".
How to Choose Wedge Gate Valve?
When choosing a gate valve for a specific application, it is essential to consider several factors to ensure optimal performance and longevity. Some key factors to consider include:
Operating conditions
Evaluate the operating conditions, including temperature, pressure, and flow rate, to select a gate valve that can handle the specific demands of your application.
Valve size
Consider the pipe size and flow requirements to determine the appropriate valve size. Choosing the correct size ensures efficient flow control and prevents excessive pressure loss.
Materials of construction
Select the appropriate materials for the valve body, gate, and seats based on compatibility with the fluid being handled. Consider factors such as corrosion resistance and temperature tolerance.
Valve design
Choose between rising stem and non-rising stem designs based on space constraints and ease of operation. Additionally, consider whether a solid wedge or flexible wedge design is more suitable for your application.
End connections
Evaluate the type of end connections required, such as flanged, threaded, or welded ends, based on the piping system and installation requirements.
Industry standards and certifications
Ensure that the selected gate valve complies with industry standards and certifications to guarantee its quality, reliability, and safety.
Our Factory
Group has 5 subsidiary corporations, located in Anyang, Tianjin, Hongkong and Singapore countries and districts. Headquarters is in hometown of oracle in Henan province, location of world cultural heritage "Yin Ruin", Anyang city, one of eight ancient capitals of China.
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