Working of gate valve pdf

Working of gate valve is displayed here in following figure. I can use acrobat distiller or the acrobat pdfwriter but i consider your product a lot easier to use and much preferable to adobes a. In most cases if a gate valves breaks in the closed position, gate valve repair work has to be done. Control valves are an increasingly vital component of modern manufacturing around the world. When they dont, the water pressure in the home can be affected and leaks can form where the valve is faulty. If youd like to know more about gate valves, email xhval.

The valve manufacturers are constantly working to improve lifetime and performance of valves. Plug, type s soft seal 1 this users guide contains information important to the proper installation, maintenance and safe use of an. Plug valve, slim valve for onoff control but with some pressure drop. The stems of jc gate valves are forged from one piece and acme threaded, then mechanized and finally provided with a smooth finishing in order to minimize friction. Gate valve is basically used in fluid pipelines for controlling the flow of fluid. Knifegate valves come in all sizes and can have manual hand wheels or pneumatic actuators to raise and lower. Handwheel malleable iron astma 47 silicon bronze astm b 371 4. A gate valve repair guide for when valves will not. Sometimes a curb valve will be located in the sidewalk area. Parallel gate valves parallel slide gate valves for those applications when large temperature variations are expected or fast shuttoff is required, this is the most ideal design. Always wear rubber gloves when handling the gate valve 1. Series dm gate valves, the premier gate valves in the oil and gas drilling market, are specifically engineered for the rigorous requirements of oilfield.

Solid wedges, flexible wedges, and split wedges are used in valves having inclined seats. Hence there will not be any leakage of fluid through the valve once valve is closed completely. Gate valves are multiturn valves with rising stem i. Gate valve standard features hancock gate valves are designed and manufactured to provide maximum service life and dependability. The wedge shall be totally encapsulated with rubber. The closure member of gate valves either stops or allows flow through the valve and acts somewhat like the opening or closing of a gate. In gate valves, the union of stem and wedge shall be in t form, designed to prevent the stem disengaging itself from the wedge while being in service.

Since crane valves are used in a variety of applications, the following descriptions may provide a basic guideline in the selection of steel valves. Large diameter knife gate valves are often used in water and wastewater treatment plants and stormwater pumping stations. Definition of gate valve a valve utilizing a gate, usually wedgeshaped, that allows fluid flow when the gate is lifted from the seat. The computer designed hand wheels of all kitz bronzebrass valves, the product of kitz human engineering, feature the ideal combination of operational efficiency and high mechanical strength for reliability. A gate valve is the most common type of valve that used in any process plant. A gate valve consists of an actuatorsuch as a lever, a hand wheel or an electric motora housing, which holds the valve mechanism, and a gate a rectangular or circular piece of metal that. Pinch valve, for slurry flow regulation and control. In such a design, a wedge slides cross a general passageway in order to control fluid flow like a sliding gate hence, the name. When handle wheel will be rotated in clockwise direction, steam and gate will move in downward direction across the fluid flow line and gate will be tightly located between the two seats. Once closed, line pressure forces the gate up against the downstream port seals which are tested up to 7,500 psi.

Kitz cast iron valves are provided with either one of the two trim materials listed in the table below for versatility of service applications. Each type of valve has been designed to meet specific needs. Nevertheless, the gate valve is also one of the most versatile valves to use for industrial applications. The valves shall have a ductile iron body, bonnet, and oring plate. There will be one gate or wedge in gate valve and it will control the fluid flow. Gate valves one of the original valve designsare ideally suited for onoff, primarily liquid, service. However, compromises are unavoidable for economic reasons. Shape of gate or wedge of gate valve will be a type of flat circular plate or rect. In addition, this design allows for a very light working weight, making it wellsuited for mounting onto less. Gate valves work by inserting a rectangular gate or wedge into the path of a flowing fluid.

Gate valves standard configurations basic cryogenic bellow seal gate valve description gate valves are primarily designed for onoff services when a straightline flow of fluid and minimum restriction is desired. The control valve handbook has been a primary reference since its first printing in. A leaky gate valve can be fixed simply by adjusting or completely replacing the washer or other packing material. Stringy pulp would get stuck between the wedge and the seat of. Gate valves work by inserting a dam gate into the path of the. Types of gate valve based on body, bonnet connection. Fullstem travel to open or close a gate valve requires many turns of its hand wheel or an actuator. They are commonly used where a minimum pressure drop is.

The suction and discharge valves are key parts of every reciprocating compressor. Knife gate valves were originally designed for the pulp and paper industry. A knife gate valve is a component that utilizes a blade to cut through clogging of heavy liquids. The everbilt lead free gate valves feature a the everbilt lead free gate valves feature a simple design that can quickly and reliably block or permit the flow of fluids, gases, or fumes. Gate valves gear operated bare stem for actuation 2 piece bonnet design 4 pdf machine is a pdf writer that produces quality pdf files with ease. Gate valves have one of the simplest working mechanisms. Butterfly valve butterfly valve and globe valve butterfly valve and ball valve butterfly valve and gate valve check valve gate valve globe valve ball valve valve shaped like a. Gate valves are usually installed with inline piping that requires very little obstruction to flow. Gate valves have less resistance to flow than globe valves, and should always be used fully open or fully closed. Gate valves are not quick opening or closing valves. Gate manufacturers in india and china can provide highquality gate valve. Knifegate valves should never be used in a restrictive role ie half open as the base of the knifegate will wear rapidly and not seal properly when closed. Gate valves are under a lot of pressure to work properly. It is a linear motion valve used to start or stop fluid flow.

Work in accordance with health and safety rules of work site. The gate faces can be parallel but are most commonly wedgeshaped in order to be able to apply pressure on the sealing surface. Gate valves are primarily designed for onoff services when a straightline flow of fluid and minimum restriction is desired. The stem is designed to the basic dimensional requirements of the applicable specifications such as api 602. Types of gate valve and parts a complete guide for engineer. Gate valves work by inserting a rectangular gate or wedge into the path of a. Piston valve, for regulating fluids that carry solids in suspension. These valves were designed to work in some of the most corrosive, erosive and abrasive environments in the world.

The valve seat on the other hand is made of two pieces. When the gate valve is fully open, there is a very low pressure drop across the valve. Bfe reserves the right to change designs, dimensions or specifications w ithout notice. Asbestosfree gland packing all kitz bronzebrass gate and globe valves. Color coding is made on the spoke of the handwheel plate a and on the body plate b of gate or globe valves and on the cover of swing check valves and strainer.

This would enable you to close the curb valve and the water by using a. Gate valve working principle mechanical engineering. It contains an integral back seat shoulder, which mates with the integral backseat of the bonnet. Gate valves globe valves swing check valves tilting disc check valves gate valves serve as efficient stop valves with flow in either direction. These valves contain a gate mechanism that when lifted opens the valve and when lowered closes it. Weights and dimensions can be changed without notice. The stem is forged steel and part of the valve trim. One of the most significant characteristics of this type of valves. Some valves are capable of throttling flow, other valve types can only stop flow, others work well in corrosive systems, and others handle high pressure. All gate valves meet the design requirements of standard api 600, api 603 and bs 1414, with testing to api598. This is the most popular design and used in a large number of gate valves. Vent station and pump corresponding to gate valve to atmosphere.

Market segment commercial valves industrial valves severe ball valves. Double oval in body casting, white handle and blue hang tag dezincification resistant no packing gland, packing only in this size. Properly selected and maintained control valves increase efficiency, safety, profitability, and ecology. Mkp valves conform to api flange dimensions in all pressure class ratings. Each valve is designed according to the working conditions. Knife valve, similar to a gate valve, but usually more compact. The seats are parallel and the disc has no contact with the seats during the stroke of the valve. The new concept for the sealing area has significant advantages concerning maintenance. The principle is simply a knife or gate which is dropped in front of the flow. If the valve has a rising stem its position can be. A gate valve functions by lifting a rectangular or circular gate out of the path of the fluid. The valve stems are threaded and matched to a stem nut to convert the rotational output of the actuator to linear movement of the valve stem.

Body body is the principal pressure containing part of a valve. Valve failure is the single most reason for a scheduled or unscheduled shut down. The following are some of the disadvantages of gate valves that must be considered when selecting a gate valve for an application. The positive shutoff and reliable performance of red valve knife gate valves make them ideal for a variety of applications, such as pump isolation, on materials ranging from stormwater to raw sewage, grit and sludge. They are operated by a threaded stem which connects the actuator generally a hand wheel or motor to the stem of the gate. The gland, gland flange assembly utilizes a separate, two piece design.

The valve guard, poppets, springs and wear shims are conventional. To select the correct valve to fulfill these functions properly, an outline of the different types of valves and their features is given below. Gate valves require very little space along the pipe axis and hardly restrict the flow of fluid when the gate is fully opened. Jec gate valves are outside screw, rising stem, bolted bonnet construction. All valves are designed to stop, allow, or throttle the flow of a process fluid. A gate valve can be defined as a type of valve that used a gate or wedge type disk and the disk moves perpendicular to flow to start or stop the fluid flow in piping. The term gate valve originated from the words gatan, gap, gasse and gat, and implies a passage with a. This is the simplest design available and it is used for inexpensive valves.

The closure member of gate valves either stops or allows flow through the valve and acts somewhat like the opening or closing of a gate and is called, appropriately, the gate valve. Valves shall conform to the latest revision of awwa standard c515 covering resilient seated gate valves for water supply service. This requires a gasket to seal the joint between the body and bonnet. Risingstem valves are those designs operated by pushing or pulling the valve stem. Classification of gate valves is usually made by the type disk used. A gate valve, also known as a sluice valve, is a valve that opens by lifting a barrier gate out of the path of the fluid. The following set of photographs shows a handoperated gate valve cut away and painted for use as an instructional tool in three di. Knifegate valves often just called gate valves, these are used as isolation valves. This article is all about leaking gate valve problems and gate valves that dont operate correctly by martin smith an emergency plumber in manchester but also an agent that covers the whole of the uk with over 400 recommended engineers national.