The series 7800 check valve assembly is lighter and faster to install, and costs less than flanged and wafer valve assemblies. Check valves are designed to pass flow in one direction with minimum resistance and to prevent reverse or back flow with minimal leakage. Different types of valves with pdf file engineering. The valve operating principle relies on a flexible section of pipe being flattened between pinched two moving bars like a vice. Swing check valve with steel reinforced rubber disc, the disc being an integral part of the body gasket. The principal types of check valves used are the teepattern lift check, the swing check, the tiltingdisc check, the wyepattern lift check, and the ball check, illustrated in figs. The dual plate wafer check valve lug type covers the bolt along the entire length of the body. Nozzle check valves are commonly made in steel for high. When a check valve is needed to prevent backflow, nibco has a complete lineup, including the nibco ring check with selfclosing disc, horizontal swing, sliding disc, silent check and y pattern. A check valve, clack valve, nonreturn valve, reflux valve, retention valve or oneway valve is a valve that normally allows fluid liquid or gas to flow through it in only one. Swing check valves operate in horizontal pipelines, or in vertical pipelines. Sanitary standards the checkall style 3s check valve is compliant with 3a sanitary.
Parker provides the industrys widest selection of check valves, available in a variety of end connections. Check valves are automatic shutoff valves that are commonly used for preventing backflow or drainage in a piping system. Ball check valves are used in spray devices, dispenser spigots, manual and other pumps, and refillable dispensing syringes. Hdl model 5087 is the most widely used ball check valve for municipal and industrial backflow prevention. For flanged type 15 50 mm with the body material of pp or pvdf, true union ball check valves can be used. A ball check valve is a type of check valve in which the movable part is a spherical ball, as illustrated in figure 4. Swing check valves of type zrkzrkf are suitable for industrial employment in piping systems for transport of liquid and gaseous fluids of group 1 explosive, infl. If the valve to be disassembled or removed is closecoupled to a solenoid operated valve, make sure that the power supply to the valve is deenergized and all refrigerant is pumped out of the line. Check valve, 1, single, inline spring, brass, fnpt x fnpt. A guide to types of valves introduction a valve is a device that regulates the flow of gases, liquids or loose materials through an aperture, such as a pipe, by opening, closing or obstructing a port or passageway. Valve type c3 3000psig fixed cp c6 6000psig fixed cp c3c 3000psig compact fixed cp c3ca 3000psig compact. Swing check valves ansi swing check valves class 150 dimensions and weights nom size in 2 21. Swing check valve description swing check valves, like all check valves, are used to prevent back flow in the line. In these valves, a clapper hangs from a hinge, a clapper shaft, or a pin mounted to the.
If these valves are incorrectly specified it can lead to major operational problems. The principal types of check valves used are the teepattern lift check, the. This type of check valve is commonly used in piping systems, in which globe valves are used as flow control valves. A valve controls system or process fluid flow and pressure by performing any of the following functions. In marine environments the rising stem and threads should be protected against corrosion. Ict, isc and icft check valves, check valve carriers, bodies. Even when all of the various categories and types of check valves are understood, it is still difficult to make a rational decision about which type of check valve is.
An introduction to nonreturn valves and the importance of correct. The tilted disc design allows a 40% greater flow rate than. Ring joint gaskets are standard for asme 2500 and above. Industrial guidelines suggest an assumption for 10% backflow if there are dual check valves that are well. Valves can be sized using the equations on page 49. Reduced bore or venturi pattern valves should be selected when minimum weight, cost, and operating time are required. The pressure of the fluid passing through a system opens the valve, while any reversal.
Bolted bonnet horizontal swing renewable seat and disc 200 psi. Lug type valves are supplied in scallop to keep the weight as low as possible, thereby minimizing the cost. Campbell check valve, 1, single, inline spring, brass, fnpt. The connector cn, cr valve is a check valve with a pipe nipple or connector housing. Inserta ict, ics and icft check valves, icc check valve carriers, icf check valve bodies and icfs check valve bodies with support member. It is designed to be used in installations where a check valve with male pipe threads is required. How to order korlok vc series check valves are ordered by part number as shown as below. The most common check valve is the disc type horizontal or vertical.
Check valves are found everywhere, including the home. Plug valve is quarterturn rotary motion valve that uses a tapered or cylindrical plug to stop or start the flow. The tilted disc design allows a 40% greater flow rate than other check valves, which means they feature excellent nonslam performance. 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. In these valves, a clapper hangs from a hinge, a clapper shaft, or a pin mounted to the underside of the bonnet. To select the correct valve to fulfill these functions properly, an outline of the different types of valves and their features is given below. Pdf smx international has designed a new check valve in production so as to offer. Adaconninserta bolt kits are used for joining adaconn and inserta. One of the most significant characteristics of this type of valves is its.
Dual plate check valve 100% bidirectional tight shut off at full rated pressure. The following part number, vc31u04tss 01 is designated for vc3 series check valve with both 14, korlok tube fitting, 1psig cracking pressure, 316ss. End connections include threaded, socket weld, butt weld, flanged, victaulic, wafer, and insert type. Check non return valves check valves or non return valves are designed to ensure one way flow only. Our check valves utilize a variety of media including oil, air, and water and are made from materials such as aluminum, stainless steel, brass, and carbon steel. That means when you order checkall valve products you are assured of receiving the highest quality check valves.
Often applied on the discharge side of pumps, check valves prevent the system. Check valves, also known as nonreturn or oneway valves, are designed to enable fluid to flow one way in a pipeline. Pinch valves are used for flow control application, usually to regulate another parameter such as slurry level or thickener underflow % solids. Korlok vc series check valves are ordered by part number as shown as below. Check valves types, construction, applications and advantages. Our valves are used in a diverse range of applications, from air and fuel systems to load holding. Ict, isc and icft check valves, check valve carriers. May have to replace with smaller port size or use type ck1 check valve. Check valves types, construction, applications and. This type of check valve is high performance, designed for applications that display very high flow characteristics. As the flow enters the valve, the disk is lifted up off the seat to allow the flow to pass. As with the globe valve, there is significant turbulence and pressure drop.
Because of this, check valves are one of the least popular valve types as they. Usually used in water pipework systems and installed immediately after the pump. Korlok check valves are designed for directional flow control only. Figure number abbreviation swdcw dual plate check wafer type swdcl dual plate check lug type swdcf dual plate check flange type standard compliance the face to face dimension shall be in accordance with api594, or other standards are available. The simple and costeffective design eliminates the need for expensive mechanical swing type of spring loaded check valves, hydraulic cushions, and other accessories used to prevent the check valve from slamming. Design and selection of check valves 4 ball check valve dual disc check valve which provides the best non. If the valve to be disassembled or removed is closecoupled to a solenoid.
The pressure of the fluid passing through a pipeline opens the valve, while any reversal of flow will close the valve. The check valve prevents backflow in the piping system. Each type of valve has been designed to meet specific needs. Check valve type nrva can be used in liquid, suction and hot gas lines in refrigeration and air conditioning plant with ammonia. Operation of check valves check valves operate in a manner that avoids. Checkall products are designed, manufactured and distributed in accordance with iso 9001 requirements. An outside screw, rising stem valve should be the normal first choice as it is easier to maintain, allowing access for lubrication of the thread. Adaconninserta bolt kits are used for joining adaconn and inserta products. The basic design of a check valve inhibits backflow in a line. Quantification of backflow rate by check valve type and size and age is typically not known or tested by manufacturing companies unless engineer tested for a specific design. When the nrva is used in liquid lines where cold, thick oil or impurities may be present, it is recommended that the standard spring be. In the fully open position the series 7800 swing clapper is held tightly against the valve body. A check valve, clack valve, nonreturn valve, reflux valve, retention valve or oneway valve is a valve that normally allows fluid liquid or gas to flow through it in only one direction. Kfs diversity in check valve configurations and materials of construction provide opportunities to service customers in many different markets.
Ball check valves may sometimes use a freefloating or springloaded ball. Sizing accuracy requires the valve to be fully open, which occurs when the pressure drop across the valve reaches or exceeds three times the spring cracking pressure five times for 3s valves. Valve type bore size pressure class bodybonnet body material trim material bal ball. Checkall valve recommends sizing check valves to ensure proper valve operation and service life. Ask us how to spec the right check valve, or get catalogs, chemical resistance guides and submittals. It is used for the leakagefree blocking of one actuator port, also in case of longer standstill times. Keystone swing type wafer check valve figure 86 kv values standard spring light spring heavy spring size dn kv m3h zeta. Nozzle check valves are commonly made in steel for high pressure classes to meet the rigors of industrial and power plant applications. Nrva can also be used in refrigerating systems with fluorinated refrigerants. The gruvlok series 7800 check valve is a compact, cost effective valve offering low pressuredrop, nonslam performance. Looking for campbell check valve, 1, single, inline spring, brass, fnpt x fnpt 36y048. Standard gasket design for boltedbonnet valves is spiral wound type up to class asme. In such a design, a wedge slides cross a general passageway in order to control fluid flow like a sliding gate hence, the name.
The cn valve is adaptable for use as a low pressure relief valve or vacuum breaker by using the desired spring settings. Lug type valves are supplied with straightthrough bores according to api594. The simple and costeffective design eliminates the need for expensive mechanical swing. Model 5087 ball check valves applied process equipment.
778 1408 1350 755 1356 588 1317 1227 881 536 111 806 1501 1471 697 995 707 127 1420 1424 1110 1084 581 187 124 134 357 69 385 124 1155 1010 920