İletişim Bilgileri

Non-Rising Stem Gate Valves (NRS);

GATE VALVE

Gate Valve is an outlet element that opens and closes conditionally in fluid-containing installations. Generally, in systems where fluid pressure is important, they are safety devices that reduce the pressure by evacuating the fluid out of the system in case the pressure rises, or cut off the fluid communication in an emergency. In hydraulic systems, especially in hydraulic systems where different controls are commanded by a single hydraulic system, such as in airplanes, depending on the condition, to which control the hydraulic pressure will be transmitted is determined via valves.

The slide valve is suitable for use with hot water, chemical fluids or compressed air. It can be used for substances at temperatures between -200°C and 700°C. DIN gate valves are flanged, welded or threaded.

DIN gate valve with soft seal gate valve is also resistant to corrosion and leakage. Soft seal valve provides protection against erosion and corrosion. Thanks to the ductile iron used in its production, it is lighter than standard valves. In traditional gate valves, debris such as stone, cement, wood in the notch of the valve base may prevent the valve from closing tightly and cause leakage. In gate valve systems, the soft-sealed valve minimizes the risk of leakage as it is designed at the base level and provides protection against foreign objects. In this respect, gate valves with DIN and ANSI standards are safe.

DIN and ANSI gate valves, which are 20-30 percent lighter than conventional valves, provide convenience in terms of installation, use and maintenance. Since non-toxic resin coating is used on the inner body, rust and corrosion do not occur. Thanks to this feature, the gate valve with DIN and ANSI standards can also be used in waste water systems. Thanks to the valve body made of ductile iron, it is more resistant to impacts than traditional valves and has a long service life.

 

 

 

Gate Valve Usage Areas

The slide valve can be used in industrial systems. It is suitable for use in areas such as liquid pipeline for oil, fertilizer, electricity and chemical ingredients. Designed for use as isolation valves. These valves make it easy to regulate the flow of fluid through the pipes. These valves are used in pipelines to start or stop flow. Gate valves are used for a multitude of functions and are often used in homes and industrial facilities. Gate Valves are not used to control any property of the fluid. They are only used to open and interrupt the flow. Therefore, they must be used in the fully open or fully closed position. They can be used in almost all kinds of fluids if materials suitable for the fluid are selected.

Gate valves have extremely low friction loss. They can be used in any way in the circuit. They also provide smooth flow and pressure loss is minimal. Gate valves save a lot of energy. Moreover, it is economical and reduces the total cost. However, these valves cannot be opened and closed quickly. They cause vibration. In systems with irregularly high temperature changes, slide valves leak due to the load on the pipe at the valve end. In addition, operation, maintenance and repair of slide valve seating surfaces are complex.

Apart from this, gate valves are suitable for use in extreme temperature and pressure conditions. They are especially used for on-off applications. Moreover, since it can be used in all sectors, it has a very common usage network.

Properties

It is a type of valve that regulates the passage of fluid thanks to the disc inside. There are many variants of the gate valve for use in different installations. When this valve is selected and installed in accordance with the installation and the fluid, it ensures the safety of the installation with full sealing. The gate valve, also called a gate valve, makes the flow of fluid with a slide that can be opened and closed in the vertical direction. The slider model can be one-piece or multi-piece. The working principle of this valve is to provide the transition between two sealing rings. When the slider is opened in the upward direction, the fluid starts to pass.

While controlling the flow of fluid in these valves, the slider is either fully open or fully closed. So it is not possible to use the slider in half opening. For this reason, the use of this type of valve is not recommended for fine-tuned transitions. It can be used especially in installations where two-sided flow is required. Since the valve can be used in the fully open position, it creates an environment with low resistance to fluids. Thus, it allows them to pass easily and smoothly. These types of valves are suitable for use with liquid or gaseous fluids. Common usage types are boiler outlets, providing a smooth passage of fluids in electrostatic precipitator lines.

As mentioned above, slide valves are valves that start the fluid and stop the flow by the movement of the flap, called the slider, in the vertical plane thanks to the worm screw shaft. It is preferred to use slide valves to operate as fully open or fully closed. Today, completely F4 types are used in new projects, but production of both continues due to the existing F5 type valves in old projects and networks.

  • The only difference between the F4 and F5 types is the installation size.
  • They are maintenance-free bidirectional valves.
  • Flow is full cross section. There is no narrowing of the diameter and the slider sits on the flat surface.
  • Every time the valve is opened, the flow in the line cleans the sealing surface and prevents the accumulation of dirt and sediment.
  • Gear box and actuator can be mounted.
  • It can be used in underground and aboveground applications. It can be controlled by extension.
  • Pressure loss is very low. It works with low torque, does not require maintenance.
  • When the slide valves with explosion-proof design are under pressure, the shaft o-rings can be changed by means of the nutring.

 

Types of Gate Valves

Elastomer Seated Gate Valves: It has a flat valve base that allows free passage of sand and gravel in the valve. If the impurities pass while the valve is closing, the rubber surface closes around the impurities when the valve is closed.

Metal Seated Gate Valves: It is primarily designed for flow isolation of a length of pipeline or piece of equipment. Uses a ductile iron gate housing bronze rings to provide a watertight seal.

Rising Spindle Metal Seated Gate Valves: It is designed with built-in safety and quality in every detail. The metal valve seat is resistant to high ambient temperatures and does not deform during prolonged compression. This ensures stable and reliable operation over the long life of the valve.

Considerations in Valve Selection

Choosing the right valve to perform the specified task is critical in terms of function, investment and operating costs and operational safety in a mechanical installation. This is a serious problem for designers, contractors, control organizations and operators. Luminaires used in mechanical installations must be impermeable to avoid problems such as operational failures, manufacturing errors, product and energy losses, water pollution and fire hazard. At the same time, they must show sufficient strength in accordance with pressure and temperature conditions.

– Risk of product mixing or explosion due to leakage,

– Vacuum supply problems due to air intake,

– Energy losses due to high pressure loss,

– Suction difficulties for pumps,

– Cavitation, noise and vibrating operation,

– Leaks in the shaft seal (Fire hazard),

– Damages caused by corrosion and erosion,

– Damages caused by working at unsuitable pressures and temperatures,

– Opening and closing due to powerfully selected actuators, torsion of the shaft, damage to the body,

– Impermissible pressure surges (danger of breakage),

– Formation of foreign material layers on the closing device,

– Accidents or incorrect control due to difficult opening and closing or broken on-off shafts,

– blockages due to solidified or crystallized products or accumulation of dirt,

– Excessive weight and excessive space, increased transportation and assembly costs,

– Actuators insufficient for high torques, tripping, stalling