Valvtechnologies metalseated parallel slide gate valves are shown in appendix a, figures 1, 2 and 3 fig. Specifically designed for steam and feedwater applications, the psg provides. Peter smith valves cast steel parallel slide valves. In the 19th century, most steam locomotives used slide. The seats are parallel and the disc has no contact with the seats during the stroke of the valve. Fluitek orsenigo valves has very extended experience in manufacturing this type of valve. It can be opened either manually or electrical power. Wedge gate valves may have seating problems on dirty service due to material collecting on seats or in the body cavity of the valve. Hifluidic high energy service valves key valve technologies. As often as the two terms are intermingled, a knife gate and a slide gate are not the same. Aug 12, 2009 the cutaway diagram for the parallel configured, opencenter, 4way, 2function, directional control valve is shown in figure 4.
Parallel slide gate valves inclined globe valve design available but not shown. Standard production range for valve sizes, asme classes and designs not. The two plates are free to adjust to temperature fluctuations and to recover high thermal expansions assuring always the best contact against the seat. Only velan offers the advantages of onepiece forged valves in sizes up to 24 600 mm. Butterfly valves double or triple offsetrubber lined. Stem guide on a parallel slide valve, an external stem guide serves two important functions. This design enables the disc faces to independently compensate for variable temperatures and pressures, and allows valve operation at lower torques. The parallel slide valve is a dynamically energized valve. Materials range from carbon steel to low alloy steel, to austenitic stainless steel, to nickel alloys. A state of the art finite element analysis of the complete valve body is used to check the structural reliability against pressure, temperature and line loads. Available in wedge gate and parallel slide configurations. Like the doubledisc or parallel seated gate valve, its disc seats against the downstream seat, depending on the flow direction.
Parallel slide pressure seal bonnet gate valves fluitek. On a parallel slide valve, an external stem guide serves two important functions. Cast steel psgv standard design data cast steel parallel slide gate valves hifluidic psgv series class valve size inch 2. Parallel slide parallel slide design has obturator made of 2 spring loaded separate plates. Cast steel parallel slide gate valve, class 150 body and bonnet cast steel a216 wcb, nickel alloy seat and disc, stainless steel outside screw rising stem, cast iron nonrising handwheel, flanged ends to suit 19. Materials range from carbon steel to low alloy steel, to austenitic stainless steel, to nickel. This particular chemical plant has its own power and steam system. Sempell dewrance parallel slide gate valves low pressure. This rotating feature allows the disc to seat in a different position on. Kvt parallel slide spring loaded gate valves are designed to provide isolation of flow in a. The disc is pushed to the seat at the low pressure side to ensure the sealing in the high pressure differential services. This is because the gate is not torqued into the seats like a wedge gate. Sempell dewrance parallel slide gate valves low pressure cast steel 300 class legend 1 four pillar design for rigidity and accessibility. Wedge gate valve our parallel slide gate valve design offers many advantages over double disc wedge gate valves in providing tight reliable shutoff in water and steam service.
Velan pressure seal parallel slide gate valves are ideal for clean service and steam. A parallel slide gate valve generally provides better shut off than a wedge gate. Instead, all 4way sections are powered directly from the pump while bypass and 4way return flow are returned directly to tank. Due to the valve design, incorporating a small facetoface dimension and lower weight than most valve types, the butterfly valve is an economical choice for larger line sizes i.
The turbine isolation valves were 20 wedge gate valves with a six inch bleed valve. The disc is in two halves, spring loaded, that seat on parallel seat rings. In accordance with bsi, bs en 1984 and ansi specifications. Design codes and overall configuration, including stemtodisc connection are the same than the wedge type gate valves.
Spring loaded discs assures good sealing performance between the discs and seatrings in small pressure. It is named after the hollow central dsectioned piston. Parallel slide gate valves can be supplied with vported outlet seat making them ideally suitable for regulating duties. Sempell dewrance parallel slide gate valves high pressure. Kvt om manual, hifluidic parallel slide gate valve key valve. Parallel slide gate valves provide a smooth flow path between seats. Understanding parallel connected valves hydraulics.
A knife gate valve is a component that utilizes a blade to cut through clogging of heavy. Hopkinsons parallel slide gate and globe valves are. Wcb generally used on feed water lines, wc6 and wc9 both used on steam lines, c12a proposed for high temp. Based on disc design, gate valves are classified into two types. Slide a flat, cylindrical, or spherical surface across an orifice for example, gate and plug valves. They are an alternative to the traditional flex wedge type gate valves. The disc slides in contact with the seats, hence the name. Design codes and overall configuration, including stemtodisc connection are the same than the flex wedge type gate valves. During each closing stroke, the two free floating parallel discs are allowed to rotate a few degrees in the plane of the seats. Parallel slide gate valve psg the valvtechnologies parallel slide gate valve psg addresses advanced design features and benefits and the need for true inline valve reparability in large diameter, highenergy piping systems resulting from those enhancements. Services with abrasive particles or applications in which wire drawing is possible require hard faced wedges and seats.
Kvt hifluidic kvt parallel slide gate valves flduantages of rut parallel slide gate llalue ouer other types of gate llalue exceptional design features of spring pack loadedspl parallel slide gate valves, kvt parallel slide gate valves psgv are designed for more reliable sealing tightness and valve opera tion in fluid flow control. Cast steel, nickel alloy seats and discs, stainless steel outside screw rising stem, bronze gland, cast iron nonrising handwheel, flanged ends. The wedge gate concept has been selected by flowserve for its equiwedge gate valve because of several functional advantages. It uses the process pressure to press the disc against the seat.
There are four basic types of flow control elements employed in valve design. Main applications general purpose stop valve main steam and feedwater isolation parallel slide gate valves ratings. Parallel slide and wedge type gate valves, designed for use. Sempell dewrance parallel slide gate valves low pressure cast. Flowdynamic behaviour of the valve in complex layout lines can be assessed in detail using computational flow dynamics simulations.
For steam generators that frequently start up and shutdown this is a major issue. This debris protecting action avoid seat failures and leaking of valves and erosion. Gate valves wedge parallel slab parallel expanding parallel slide. Interaction between simultaneously shifted functions is caused by differences in load pressures, and especially affected by the actions of the transition check valves. Carbon steel, alloy steel, stainless steel parallel gate valves, 1236 inch, 150lb600lb, flanged, buttwelded. Parallel slide gate valves swing check valves sizes dn80 to dn900 3 to 36 pressure class pn250 to pn640 asme 1500 to 4500 end connections buttweld. The valvtechnologies parallel slide gate valve psg addresses the need for true inline valve reparability in large diameter, highenergy piping systems. Sempell dewrance parallel slide gate valves high pressure cast steel legenda 1 antifriction bearings are fitted for direct handwheel operation. With our own quality renowned foundry ampo and long experience in this range of valves, poyam valves is able to design and. Whats the difference between a knife gate and a slide gate. A wide variety of parallel slide valve options are available to you, such as manual. It has several boilers that discharge into a steam header and then the steam header furnishes steam for the plant to use and also delivers steam to the turbines. It gives more insight into actual construction strategy but it is a combinational presentation because it shows interconnections simply as lines rather than internal coring and drilling of passages. Flanged parallel slide gate valve, 1236 inch landee valve.
In 1996, key valve technologies became a member of the high energy alliance of manufacturers, consisting of hp valves b. All range is offered in four standard cast materials. Uncomplicated design has segmented retaining ring and mild steel sealing ring to aid disassemby and provide maximun bonnet seal. Velan parallel slide gate valve steam and auxiliary. Used in high pressure and high temperature applications, the unique design of the taylor parallel slide isolating gate valve allows it to maintain fluid tightness without the aid of any wedging action thereby eliminating mechanical stresses between the discs when opening or closing the valve. As the valve is cycled under differential pressure, the extremely hard surfaces continually hone and polish each other instead of scratching and galling.
The butterfly valve complies with asme facetoface dimensions and pressure ratings. To prevent damage to the stem guide and internal fittings of a parallel slide valve particularly on smaller size and those valves which are electrically. Unique parallel slide forged cage unit design comprises all operating parts of the slide discs. Pressure seal valves are engineered and manufactured in strict conformance to asme, ansi, astm, api and other applicable standards.
A parallel slide gate valve is much less likely to get stuck in the closed position. Kvts parallel slide valves are designed and manufactured to the highest technical standard. The peter smith valve company is an independent company, established in 1969, specialising in valves for the control of fluids in water systems. You can also choose from brass, stainless steel, and rubber parallel slide valve there are 70 suppliers who sells parallel slide valve on, mainly located in asia. Products related to flanged parallel slide gate valve, 1236 inch. It provides zeroleakage using out robotically integrated thermal spray coating process. Class 150 parallel slide gate valve macneil steel and. Split disc, double disc or parallel slide is especially suitable for use with noncondensing gases and. It is also referred to as a slide valve or parallel slide. Taylor class 600 parallel slide gate valve macneil steel. Only at the end of the stroke the disc mechanism ensures the. Since its foundation, kvt has cooperated closely with hp valves b.
Dewrance parallel slide gate valves, sempell, isolation. Kvt hifluidic kvt parallel slide gate valves flduantages of rut parallel slide gate llalue ouer other types of gate llalue exceptional design features of spring pack loadedspl parallel slide gate valves, kvt parallel slide gate valvespsgv are designed for more reliable sealing tightness and valve opera tion in fluid flow control. The seal is improved rather than degraded with wear. The valve people australian made australian owned australian agents for parallel slide valves 0114 john fig. Valve and flow control equipment specialists since 1900. Parallel slide gate valves severe service valve for high. Features and benefits velan pressure seal parallel slide gate valves are ideal for clean service and steam.
The d slide valve, or more specifically long d slide valve, is a form of slide valve, invented by william murdoch and patented in 1799. Parallel slide and wedge type gate valves, designed for. These split wedge concept is designed with the best feature of normal parallel. Valve suppliers often receive quote requests for a knife gate when what a company is really looking for is a slide gate for dry bulk material handling. Parallel slide gate valve provides a smooth flow path between seats. The disc surfaces are always in contact with the body seats. Spring loaded discs assures good sealing performance between the discs and seatrings in small pressure differential services. As the process pressure rises it will overcome the upstream disc spring force and push the disc away from the seat thereby permitting process pressure into the body cavity. If this the parallel slide valve is preferred over the flex wedge in high temperature applications as there is no possibility for thermal locking and because seat integrity increases with increasing pressure. This design of gate valve is commonly used for clean fluids and steam applications. Rotate a disc or ellipse about a shaft extending across the. This allows a warmup bypass feature two open bypass valves and pressure equalizing system in one or the opposite direction by opening one bypass valve and keeping the other in the closed position. Specifically designed for steam and feedwater applications, the psg provides bidirectional zeroleakage using the ram coating systems. The gate is designed to slide along the edge of the mezzanine to allow access to the mezzanine.
Switch valves for coking service 20 valvtechnologies, inc. Parallel slide design main features two discs and just one wedge design gate valve. Parallel the parallel connected, opencenter valve stack performs no effluent flow recovery. Parallel slide the peter smith valve company is an independent company, established in 1969, specialising in valves for the control of fluids. Body made of superior strength forgings and optional cast steel.
Camtech parallel slide gate valves are heavy duty, outside screw and yoke type, bolted bonnet, rising stem and nonrising handwheel type. Development of the flowserve edward equiwedge gate valve. Solid wedge design or split wedge design is available upon request. The slide valve is a rectilinear valve used to control the admission of steam into, and emission of exhaust from, the cylinder of a steam engine. The dsi pressure seal product line offers flexwedge and parallel slide gate valves, straight and ypattern globe valves, swing, lift and tiltdisk check valves. Gate valve types, construction, applications and advantages. The image description page explains how this svg animation can be viewed. Parallel slide gate valve venturi design pressure seal configuration page 15 via cardona, n 48 salt di povoletto ud cap 33040, italy tel. 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.
The parallel slide design eliminates sticking or thermal binding experienced with wedge gate valves. The inside diameter of a conduit gate valve is equal to the inside diameter of the connecting pipe. The wiping action of the discs over seats meanwhile operating the valve removes debris and prevent premature wear of the components. This valve worked by connecting the upper and lower valves so as to be worked by one rod or spindle, and in making the stem or tube which connects them hollow, so as to serve for an induction pipe to the u. Materials are either to astm asme standards or to en standards, either harmonized or calculated to design conditions. Parallel slide gate valves require smaller operative forces. Plug valves lubricated balancedsleeved, linedexpandinglift. Hopkinsons fgv valve brochure trillium flow technologies. Parallel slide gate valves carbon,alloy or stainless steel asme classes 6002500, 2 24 50600 mm flange dimensions are in accordance with asme b16. Cast body construction and forged body construction are both available. Parallel slide gate valve gate globe and check yancheng.
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