Knife Gate Valves

What is Knife Gate Valve?

Knife Gate valves are structured predominantly for on-off and separation administrations in frameworks with high substance of suspended solids. The knife gate valves are particularly advantageous for taking care of slurry, thick, destructive, and grating media. The valves have a limited weight drop in a completely vacant position, they are anything but difficult to incite, they have a moderately low weight and are cost-effective.

In which industries, Knife Gate Valve is used?

Knife gate valves are supposed on account of their capacity to slice through media containing solids. They work by lifting a round or rectangular gate out of the way of the media. The fixing surfaces between the gate and seats are planar, so knife gate valves are frequently utilized when a straight-line stream of liquid and least limitation is required.

Knife gate valves were intended for explicit use in the mash and paper industry. This was because of tacky mash impinging between the wedge and seat of an ordinary knife gate valve and forestalling stream shut-off.

How does a Knife Gate Valve Work?

A knife gate valve works by permitting thick media to effortlessly stream over delicate seals with no impedance. They work by hacking up the media as it goes through the valve. Today knife gate valves are utilized in various handling plants everywhere throughout the world and come in enormous sizes. This makes it simpler for the valve to deal with thick progressions of media including oil, oils, slurry, squander water and paper mash. Because of this, knife gate valves have low-pressure impediments and are intended to situate the cutting edge into a delicate seal with no disturbance.

Knife Gate Valves- Valvulas Zubi

At Entellus Tech we supply a wide range of knife gate valves for an array of processes and industries. We offer Knife Gate Valves of Leading Brands like Valvulas Zubi and Wolseley.

Types of Knife Gate Valves

  • Single wedge knife
  •  Square and round Wafer knife gate Valve
  • Unidirectional knife gate valve
  • Bidirectional T200
  • Lug bidirectional
  • Lug unidirectional
  • Rubber sleeve kgv
  • Hopper shape silo valve

 

 

 

 

 

OXYGEN SERVICE

Oxygen Service is a layout function or production procedure that is offered on some measurement devices that make it possible to measure pure oxygen or use in environments containing dangerous or risky concentrations of oxygen.

How dangerous is Oxygen?

An oxidizing agent like oxygen is one among the 3 things required for fire, the other two are a fuel (something to burn) and a supply of heat or ignition. Once an uninhibited chain reaction is added to an environment with a powerful oxidizing agent, the result are often explosive.

Minimizing risk

As there is always a risk of fire, choosing highly compatible materials for valves is necessary. Not only this, it is essential to utilize the best practices from design to manufacture, to the point of operating the product.

Valves for oxygen service application

Ball valves

When the ball valve is partially open, thin edges of the ball are exposed to the flow stream. Ball valves are inherently fast opening that results in concerns regarding adiabatic compression and temperature rise, particularly for any elastomers downstream within the piping system. Ball valves could also be equipped with gear operators to make sure slow gap.

In addition, ball valves shall be designed with internal pressure relieving features to avoid pressure build up from liquid or cold gaseous oxygen trapped within the ball cavity.

Butterfly valves

When open, butterfly valves operate with the valve disk within the flow stream. In case of reverse flow, the seat groove will become a thin part within the flow stream area and wishes to follow the represented burn resistance methodology. The shaft to bonnet or shaft to body bearing/bushing ought to be a metallic design and shall be designed to fulfill the mechanical needs at maximum pressure differential across the valve disc.

Globe valves

Globe valves are usually utilized in cold oxygen on-off (open-closed) or throttling applications and can be manual or automatic. The trim design varies with specific valve manufacturers however it will have a relatively thin section fitted with non-metallic inserts to reduce leakage. Sometimes, for high differential pressures, cage trims are used, that are sometimes of thin section and provide sites for debris to be trapped and make friction. During this case, the trim of the globe valve shall be designed for a higher burn resistance.

Pressure relief valves

Pressure relief valves in cold oxygen service can experience warm gaseous relief throughout initial opening and high velocities across the trim. there’ll be impingement on the exhaust a part of the housing and outlet piping though these areas are commonly at or close to atmospheric pressure. The size of the trim and also the valve inlet determines the gas velocity at the valve inlet.

If particles are present there’ll be impingement on the exhaust a part of the housing and outlet piping. When performing an oxygen hazard analysis and risk assessment on pressure relief valves the potential for contamination or plugging of the exhaust vent shall be considered. just in case of the latter, the pressure within the exhaust pipe will exceed 100 pc of the set pressure.

For pilot operated pressure relief valves, the pilot valve are going to be exposed to oxygen and shall be designed accordingly.

CHLORINE SERVICE

Chlorine is a dangerous and toxic material. It’s a greenish-yellow, noncombustible gas with a distinctive, pungent odor. The gas acts as a severe infliction if inhaled. It is noncombustible in both gaseous and liquid states. However, it’s capable of supporting the combustion of certain substances.

Application of Chlorine in various industries:

Chlorine is especially used in producing chemicals. These embody solvents, pesticides and herbicides, plastics and fibers, refrigerants and propellants. It’s also an ingredient in bleach, deodorizer and disinfectant. Additionally, chlorine is widely employed in bleaching pulp, paper, and textiles for drinking water and swimming pool purification; in sanitation of industrial and sewerage wastes.

Chlorine service will be divided into two categories: wet systems (greater than 150 ppm of water) and dry systems (less than 150 ppm of water). Knowing whether or not the chlorine system is wet or dry determines what materials of construction will be selected to best perform within the system.

The risk associated with Chlorine

Chlorine service is typically difficult. It’s extremely reactive as a liquid or gas and may simply go from a generator to a personal or environmental catastrophe if extreme precautions aren’t taken. chlorine applications aren’t for the inexperienced or unverified.

Valves  for Chlorine Service

Some valve varieties are better than others when it comes to chlorine processes and operations.

Globe Valves

Several factors make the globe valves one of the most effective selections for chlorine use.

  • Ability to produce a tight shutoff.
  • Ability to verify whether it’s open or closed.
  • The multi-turn operation that provides for slow and careful opening and closing.
  • Bi-directional seating – its ability to shut off in each direction while not trapping liquid within.
  • Any leak can permit moisture from the air to enter the system inflicting corrosion thus versatile graphite or PTFE ought to be used for packing.

Ball valves

Providing tight shutoff, the ball valve contains a reliable stem seal design. They could be full-bore or reduced-bore. A full-bore (or full-port) valve has an opening the same diameter as the piping, therefore there’s no restriction in flow through the valve, as a result of chlorine that gets trapped within the valve may expand, ball valves ought to have a release for any ensuing pressure. Either a relief hole bored into the ball or pressure self-relieving seats can be used.

Single-seated segmental ball valves, on the other hand, don’t trap liquid once they are closed. They’re usually used as control valves.

Fully-lined ball valves are lined with a fluoropolymer resin, thus there’s no metal to chlorine contact. they could be used with wet or dry chlorine gas without worrying about corrosion.

Butterfly valves

Both soft-seated superior butterfly valves and fully-lined butterfly valves are used.

The soft-seated valves are helpful in large pipes.

In fully-lined butterfly valves, like fully-lined ball valves, the fluoropolymer lining prevents the chlorine from touching any metal.

Criteria for valves selection

Stem seal

In order to prevent leakage through the stem seal in the presence of huge or frequent temperature fluctuations, consider using bellows seals or live-loaded packing.

Temperature

Consider both ambient and processing temperatures when choosing valve materials. keep in mind that throttling applications will produce pressure differentials, leading to lower temperatures.

Wet or dry chlorine

Wet chlorine is extremely corrosive to a variety of metals, whereas dry chlorine isn’t. If the chlorine being processed is dry, however, might become wet, choose materials that are appropriate for both.

Flashing and cavitation

The capacity for flashing and cavitation should be kept in mind and its avoidance should be considered when sizing the valve.

Dual Plate Check Valves

Goodwin Check Valves are available in 5 basic body styles: Wafer, Flanged, Solid Lug, Buttweld end, Hub end, and in an extensive range of sizes, pressure classes, and materials. Its principal features are those of it being Retainerless as standard, i.e. nobody plugs, and its patented “slim” plate design giving improved flow efficiencies and superior metal-to-metal seating shut-off. The Goodwin Check Valve embodies other performance-enhancing features such as Plate Shock Bumpers, Independent Plate Closing Action, and heel lift (Seat Life).

Entellus Valves

Forged Steel Valves

Forged steel valves are used in Oil Refining and other industrial applications where forged steel material is required. Higher pressures and temperatures are usually involved and the line size is generally under the size of “2”. In other conditions, forged steel valves might be a good choice for better performance, such as system requirements for socket-weld piping and compatibility of media. Forged check valves, forged gate valves, forged globe valves are a few of the different types, and depending on what the media is, depends on which one is used.

Ball Valves

Global Valve and Controls trunnion design ball valves incorporate the use of upper and lower supports (GVC trunnion plate system) to retain the ball under pressure. Global Valve and Controls API 6D trunnion ball valves have a secondary sealant injection system for stem seals and seats in the event of providing a temporary seal to an otherwise damaged area. The Global Valve and Controls trunnion ball valve design using the upper and lower trunnion plate system essentially doubles the safety and reliability of a standard trunnion ball valve.