Julyaugust and septemberaugust 1954 when i started some years ago, to build a miniature steam locomotive i decided to design it from the ground up using good engineering, or model engineering, principles. Body made of superior strength forgings and optional cast steel. Cast body construction and forged body construction are both available. The term valve stems from the latin valva, which means moving part of a door. Gate valve manufacturer china valve industrial valve. Specialised valve solutions ltd 2nd floor 2 woodberry grove north finchley n12 0dr united kingdom. Unique parallel slide forged cage unit design comprises all operating parts of the slide discs. Double faced, internal screw, parallel slide valves designed for gas distribution systems where reliability of operation and completely ef fective closure is essential. Spring loaded discs assures good sealing performance between the discs and seatrings in small pressure differential services. Cast steel parallel slide valve flanged pn16 leengate valves. Class 150 parallel slide gate valve macneil steel and. The gland is the same standard design employed throughout valvtechnologies various valve product lines. As a chinabased gate valve factory with over 15 years api certification, we offer wide range gate valves in various materials like cast steel, stainless steel and forged steel etc.
Move a disc, or plug into or against an orifice for example, globe or needle type valve. 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. Parallel slide valves parasura parallel slide has kosos own designconstruction to realize very good and firm metaltometal touch sealing performance. The disc is pushed to the seat at the low pressure side to ensure the sealing in the high pressure differential services. It is also referred to as a slide valve or parallel slide. Hifluidic high energy service valves key valve technologies. Parallel slide gate valves are the best solution for high temperature service. Valvtechnologies metalseated parallel slide gate valves are shown in appendix a, figures 1, 2 and 3 fig. Stainless steel casting to bs1504425c11 valve seat. They are an alternative to the traditional flex wedge type gate valves. Design codes and overall configuration, including stemtodisc connection are the same than the flex wedge type gate valves. This design of gate valve is commonly used for clean fluids and steam applications. I selected slide vales, chiefly because of ease of manufacture.
Parallel slide gate valve gate globe and check yancheng. Slide a flat, cylindrical, or spherical surface across an orifice for example, gate and plug valves. Like the doubledisc or parallel seated gate valve, its disc seats against the downstream seat, depending on the flow direction. Pressure seal parallel slide gate valves datasheet. Parallel slide gate valves can be supplied with vported outlet seat making them ideally suitable for regulating duties. Flowdynamic behaviour of the valve in complex layout lines can be assessed in detail using computational flow dynamics simulations. The outstanding feature of the parallel slide type v. It is designed to permit removal from the bonnet or the yoke whilst the valve is in service. In the case of parallel slide gate valves, be aware that the stopper on the. Fluitek orsenigo valves has very extended experience in manufacturing this type of valve. Valves are classified according to their basic design type globe, gate, butterfly, ball or plug and diaphragm valves.
The wiping action of the discs over seats meanwhile operating the valve removes debris and prevent premature wear of the components. A knife gate valve is a component that utilizes a blade to cut through clogging of heavy. The gate is designed to slide along the edge of the mezzanine to allow access to the mezzanine. Its execellent shutoff performance, brought about by the metaltometal sealing, makes it suitable to a variety of severe services, including emergency shutoffopening at extremely. The design of the parallel slide gate valve eliminates the risk of sticking and thermal binding. Britton valves wide range of slide valve products are the perfect solution to your slide valve needs. The inside diameter of a conduit gate valve is equal to the inside diameter of the connecting pipe. The disc is in two halves, spring loaded, that seat on parallel seat rings. Cast steel parallel slide valve flanged pn16 leengate.
The valvtechnologies parallel slide gate valve psg addresses the need for true inline valve reparability in large diameter, highenergy piping systems. A gate that can be opened or closed by sliding in supporting guides. The valve is fitted with a backseating device to further protect the gland packing when fully open 3. The top countries of suppliers are india, china, and india, from which the percentage of parallel. Like the doubledisc or parallelseated gate valve, its disc seats against the downstream seat, depending on the flow direction.
Our company can offer customized valves service according to your requirement too. 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. Lv7860 flanged pn16, cast steel astm a216 wcb body, tda 58 copper nickel silicon alloy seat rings, stainless steel stem, exfoliated gland packing, bs970 431 s29, designed to bs en 1984 rated pn16, temperature 0c to 425c. A cookie is a small text file that is placed on your computers hard drive by your web browser when you visit a website. As often as the two terms are intermingled, a knife gate and a slide gate are not the same.
Specifically designed for steam and feedwater applications, the psg provides bidirectional zeroleakage using the ram coating systems. Cookies enable websites to access information about the pages you visit and your actions and preferences such as login, language, font size, and other display preferences over a period of time. Uncomplicated design has segmented retaining ring and mild steel sealing ring to aid disassemby and provide maximun bonnet seal. There are four basic types of flow control elements employed in valve design. Ideal for applications where the valve must remain in the fully open or closed position for long periods yet. Kvt parallel slide spring loaded gate valves are designed to provide isolation of flow in a. This is because the gate is not torqued into the seats like a wedge gate. Seats and doors are made of our special tda58 nickel based alloy developed for high galling resistance. With a substantially lowered failure rate, its rack and pinion construction is flanged to meet ansi, bs, or european standards.
Parallel slide valves, south wales cambrian valves. 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. Stem guide on a parallel slide valve, an external stem guide serves two important functions. Parallel slide gate valves open easily under all conditions. Gland and flange they are in forged steel and are supplied in two pieces, selfaligning design to permit the gland to descend parallel to the stem even if the eyebolts are unevenly. Parallel slide and wedge type gate valves, designed for. Steamco manufacture cast and forged parallel slide gate valves in 15nb 12 to 1050nb 42 from 150 to 4500 class in flanged, screwed and weld ends. Providing tight shutoff under the most severe conditions, this exclusive disk and wedge design resists effects of extreme temperatures, gross thermal transients, high and low differential pressures, and dualphase fluids. All valves supplied by hp valves are designed for application. The disc surfaces are always in contact with the body seats. Cast steel psgv standard design data cast steel parallel slide gate valves hifluidic psgv series class valve size inch 2. Gate valve types, construction, applications and advantages. It is named after the hollow central dsectioned piston. Thermal binding is a condition commonly associated with wedge gate.
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. Velan pressure seal parallel slide gate valves are ideal for clean service and steam. Kvt om manual, hifluidic parallel slide gate valve key valve. Increased plant and personnel safety is made possible. This debris protecting action avoid seat failures and leaking of valves and erosion. Rotate a disc or ellipse about a shaft extending across the diameter of an. Materials range from carbon steel to low alloy steel, to austenitic stainless steel, to nickel. In piping technology, a valve is a piping component which controls, directs or mixes the fluid flow by opening, closing, diverting or partially obstructing the passage through itself. If you by parallell slide valves mean the types knifegate valves, there exists, mostly used for waste water, valves dropthight in both directions from 0 barg to 10 barg, lower for sizes normally above 300mm 12 inches size. As the valve is cycled under differential pressure, the extremely hard surfaces continually burnish and polish each other rather than scratching and galling. Blackhall taylor valves high pressure steam valves. A parallel slide gate valve is much less likely to get stuck in the closed position.
For steam generators that frequently start up and shutdown this is a major issue. A wide variety of parallel slide valve options are available to you, such as manual. Specifically designed for steam and feedwater applications, the psg provides. Psgv in this brochure is based on the principles of parallel slide gate design with independent discs, wide flat seats, variable numbers of spring pack to be. Parallel slide gate valves require smaller operative forces. This is only practical in manual valves or electronically. Pressure seal valves manufacturer in mumbai, gas valves. Live loaded packing prevents packing load loss due to. The potential for failure to open of wedge gate and parallel slide valves, under certain process conditions may be.
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. There is international acceptance that where arduous duties with high pressure hot water and steam are concerned the parallel slide isolating gate valve is superior to all forms of wedge gate valves, and to globe stop valves. It can be opened either manually or electrical power. Rotate a disc or ellipse about a shaft extending across the. Australian pipeline valve parallel slide piston check. Stainless steel casting to bs3100316c16 valve stem. Valves are manufactured in pressure seal, bolted and welded bonnet design in forged and cast. Parallel slide pressure seal bonnet gate valves fluitek. Whats the difference between a knife gate and a slide gate.
Parallel slide gate valve provides a smooth flow path between seats. Cast iron inside screw gate valve to bs 3464 25 cast iron parallel slide valve to bs 5151 26 cast steel parallel slide valve to bs 5157 27 cast steel gate valve outside screw 28 ansi 150 lbs gate valve 29 section 3 cast iron swing check valve to bs 5153 31 cast iron globe and angle check valves to bs 5152 32. 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. 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. A parallel slide gate valve generally provides better shut off than a wedge gate. Mainly used in boiler maintenance to protect from severe scaling and corrosion, taylors slide blow down valve has a slide action that ensures a prolonged life cycle. The disc slides in contact with the seats, hence the name. Parallel slide valves in hc service your experiences. Dewrance parallel slide gate valves, sempell, isolation. Parallel slide and wedge type gate valves, designed for use. The wedge gate concept has been selected by flowserve for its equiwedge gate valve because of several functional advantages. Spring loaded discs assures good sealing performance between the discs and seatrings in small pressure. 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.
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