The disks are made in either a solid or flexible wedge disk. Air • Inert Gas • Oil • Steam • Water . 0000009331 00000 n Parallel disks are spring-loaded, so they are always in contact with seats and give bi-directional sealing. 0000007724 00000 n Wedge design makes the sealing surface of the valve at an Angle to the vertical center line, with better sealing performance and greater pressure; Disk guidance and optimized gate design for tight seating minimized valve leakage; The wedge valve stem is usually tempered and surface nitride treatment, offers good corrosion and abrasion resistance; Multiple available materials for high temperature, high-pressure service – Cast and Forged offerings incorporating the latest in surfacing welding technologies maximize the valve component lifetime.
Velan stem seal offers tight seal with little to no maintenance over long periods of time. Available forms are floating and trunnion wedge gate valves. �fxl��҆��E��h#g�ѫAʵqh�+��'��u�A�$"�L Steel Body • Stainless Steel Stem & Seat Rings • Steel + Stellite Face Wedge.
0000001464 00000 n There is no upward movement of the stem in a non-rising stem type.
Gc���/��`���oTdC]%�(������8�Ԑ�MK ����rJuE��� �U_6II�A �n$�ӛN&. It also improved performance in situations where thermal binding possible. In service, these valves are either in a fully open or fully closed position. However, it does not compensate for changes in seat alignment due to pipe loads or thermal expansion.
It can be used in turbulent flow also. Split-wedge or flexible-wedge type gate valves are expected to perform better than solid-wedge gate valves when thermal binding is a concern. In inside screw design, the threaded portion of the stem is in contact with the flow medium, and when you open the valve, handwheel rise with the stem.
0000003888 00000 n 0000134812 00000 n �tDƣͧ�V�j`�A�� JY�PB ����Q���3�S�qv�(�]s�5��Fl�0?��W55��N�� Y(�h�]���dXSP0G���}�P^հ�y�i$F��b����3dc�!��U����Ҷ�J3: 1&p!Uu�^�FF�WH���;�*��}mEr�� 0� K6�\�vl�t�bv�IR,���@+�P[�
Due to this very little pressure drops when fluid passes through a gate valve. FLEXIBLE WEDGE GATE VALVES The Velan flexible wedge, with round geometry and stem low in the cavity, was pioneered by Velan in 1960. trailer << /Size 54 /Info 13 0 R /Root 16 0 R /Prev 318074 /ID[<430d1cd92adbe16174afbea5755141b1>] >> startxref 0 %%EOF 16 0 obj << /Type /Catalog /Pages 12 0 R /Metadata 14 0 R >> endobj 52 0 obj << /S 46 /T 145 /Filter /FlateDecode /Length 53 0 R >> stream The higher the body cavity pressure, the greater the force on the gasket in a pressure -seal valve.
Gate valves are used in almost all fluid services such as air, fuel gas, feedwater, steam, lube oil, hydrocarbon, and all most any services.
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Thermal expansion of the steam line sometime causes distortion of valve bodies which may lead to thermal blinding.
These cuts vary in size, shape, and depth.
0000023007 00000 n What’s the Eccentric semi-ball valve used for?
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They are lighter in weight than their bolted-bonnet counterparts. A correct profile of the disk half in the Figure 6 Flexible Wedge Gate Valve flexible wedge design can give uniform deflection properties at the disk edge, so that the wedging force applied in seating will force the disk seating surface uniformly and tightly against the seat. 7⑴�ED�\���z��;Q0��2?��u��c�XL�_xL��f������}� This design improves seat alignment and offers better leak tightness. The disk of a gate valve is also known as a wedge.
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To achieve proper sealing, when the valve is fully closed, 360° surface contact is required between disk and seats. This means when a line is get heated by fluid and expand it does not create thermal blinding. Tianjin OTS Valve Manufacturing Co., Ltd. OTS valve Click here to learn about Other Types of Valve, Thank You for subscribing to Hardhat Engineer.
OS & Y means outside steam and York. In general, the two wedge gate valve sealing surface and the Angle of the vertical center line of 2 ° 52 ', 3 '30 °, 5 °, 8 °, and so on.
Therefore virtually no resistance to flow.
0000010939 00000 n Pressure seal (forged and cast steel) valves, Pressure seal y-pattern piston check valves, Bolted bonnet high pressure valves (large forged) valves, Bolted bonnet bellows seal flexible wedge gate valves, Cast stainless steel corrosion resistant valves, API 602 small forged HF acid globe valves, Bellows seal globe valves, hermetically-sealed y-pattern, XB series bonnetless globe valves (discontinued), Solid Lug type - PL, PM, dual plate check valves, Double flanged type - PF, PG dual plate check valve, Butt weld end type - PZ dual plate check valve, Bolted bonnet metal-seated knife gate valves, Bolted bonnet resilient-seated knife gate valves, Standard resilient-seated knife gate valves, RAMA easy maintenance valves for nuclear service, Type L high-temperature metal-seated ball valves, Type N severe service forged metal-seated ball valves, R-series cast and forged metal-seated ball valves, VTP-2000 high performance three-piece ball valves, Velflex high performance cryogenic butterfly valves, Type MFA & MFAS compressed air drain traps, Type MFT & MFTS float bimetallic steam traps, Type Q250 hermetically-sealed steam traps, Type SPF & SP high capacity piston-operated steam traps, Type HPTD & VTS thermodynamic steam traps, Bellows seal bolted bonnet high pressure valves (large forged), Bellows seal cast steel valves (Bolted Bonnet). Solid wedge is the most common & widely used disk type because of its simplicity and strength. Our eternal pursuits are the attitude of "regard the market, regard the custom, regard the science" as well as the theory of "quality the basic, believe in the 1st and management the advanced" for Flexible Wedge Gate Valve, They're durable modeling and promoting effectively all over the world. Velan flexible wedge offers superior tightness of seats and freedom from sticking.
0000008822 00000 n 0000106279 00000 n A gate valve is slow in operation.
The flexible wedge is a one-piece solid disk with a cut around the perimeter. Velan's proven pressure seal design. In this type of valve, stem threads are exposed to the flow medium. Installation, Commissioning and Maintenance, EMA Quick Response Centers - Valve and Automation Systems, Flowserve Valve, Actuation and Instrumentation Product Portfolio, Oxygen Valve Safety Awareness - Service Bulletin, Anchor/Darling Cast Flex Wedge Gate Valve - User Instructions (IOM), Anti-Slavery and Human Trafficking Statement, California Transparency in Supply Chains Act, Flowserve Policy for Non-U.S./Foreign Vendors, Flowserve Policy for United States Vendors, Broad versatility of nuclear applications enabled by a wide range of sizes and pressure classes, Designed to be capable and available with most actuation methods, including handwheel/bevel gear, electric motor actuated, pneumatics and hydraulics, Seismic qualifications to ensure operability under extreme plant scenarios.
These may result in corrosion and ultimately weaken the disk. Whereas in the case of outside screw design, the only smooth portion is exposed to the flow medium and the stem will rise above the handwheel.
You can see in the image. This requires a gasket to seal the joint between the body and bonnet. Size & Connections. When partially open it creates vibration and noise.
The Flex Wedge valve has a single piece, optimized gate design to provide minimized seat leakage. When the gate valve is fully open, the disk of a gate valve is completely removed from the flow. 0000001443 00000 n The disc travels along the stem like a nut when the stem is rotated. 0000052862 00000 n Gate valves used in steam systems have flexible wedges. H��W�n�H]�Z�P�9�*,��sb9�w�+� �^�dI���+�����͜[ER�c+i`fb �Ȫ���+�j��յ`�f�0vY�����D0�&3�'��c�0�X�Ƴ�Yi�s'���t����&҉���$��!G8!��}Q�g�ϑA$&E�݈����ci1y~Y���W�7OBvق Our flexible wedge gate valve is available from 150 up to 2500 pressure and We can also accept the OEM design, so whether you need special valves or have a large order to place, we can provide you with the customized service for you.
It is named because the sealing surface is wedged with the vertical center line at an Angle. Product line: Pressure seal (forged and cast steel) valves. the company make a terrific efforts to expand its international trade, raise its company profit and raise its export scale. :z��3���+BF�g}�}.��gR:~���~���96Go�;%*�?��g|���[��/��?�����Hb#+f>2y�#�a~�Dk�nT��l��/�6Wl���:e[ݮY]ue�V�*T[߳?�VTVl����d�W[�K�BV�������mtU*U�����JpJā��e��8���ų�j&O��-�9C@����n�� The flexible wedge gate valve is a single piece, optimized large bore gate valve with body guided, split wedges, offering superior leak tightness and performance. Therefore, this design is used where space is limited to allow linear stem movement, and the flow medium does not cause erosion, corrosion, or wear and tear to stem material. This type of valve is also known as OS & Y valve.
1st is screwed bonnet: This is the simplest design available and it is used for inexpensive valves. 0000008219 00000 n Most of the gate valve can be used as bi-directional, They are suitable for high pressure and temperature application and required less maintenance.
Body: ASTM A216 Gr.WCB, ASTM A352 LCB, LCC, A217WC9, C5, A351 CF8M,CF3, CF3M,CN7M, Disc: 13% Cr, 18%Cr8%Ni, Stellite, Monel Alloy20, Bronze, etc.
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High-pressure service of large sizes is usually cheaper than plug or ball. 0000014285 00000 n Your Ebook will Open in New Tab.
Wedge gate valves are named because the two sealing surfaces resemble wedges in the body. The flexible wedge gate valve is a single piece, optimized large bore gate valve with body guided, split wedges, offering superior leak tightness and performance. 0000032785 00000 n 0000022929 00000 n Freedom of movement of the disk prevents thermal binding even though the valve may have been closed when a line is cold. Velan flexible wedge offers superior tightness of seats and freedom from sticking. 0000002785 00000 n
0000015136 00000 n A correct profile of the disk half in the flexible wedge design can give uniform deflection properties at the disk edge, so that the wedging force applied in seating will force the disk seating surface uniformly and tightly against the seat. We focus on high quality, competitive price, puntual delivery, and satisfied service. Materials. DN50 to DN600 • ASA 150 Flange (others on request) Duty.
Solid wedge is subjected to thermal locking if used in high-temperature service. Opening and closing take time which is good also as it reduces the chance of hammering. Here you can see the main parts of the gate valve. We spare no efforts to make better products. %PDF-1.4 %���� 0000001903 00000 n Sometimes in high-temperature applications, the flow medium, such as water or steam, is trapped in the valve bonnet area when the valve is closed for system shutdown. 3rd is Welded-Bonnet: This is a popular design where disassembly is not required. Guided by the principle of "Prudence, Efficiency, Union and Innovation. Some special gate valve is used in slurry and powder product also such as knife gate valve.
You can see the same in images. Combination Valve of butterfly Valve Check Valve Str... Resilient Seated non-rising Stem Gate Valve, WAFER TYPE BUTTERFLY VALVE-Flanged Type Butterfly Valve, CI,DI,Cast iron wafer type butterfly valve pn16. ��H�שׁ�-�Ofn�f�Ňc�.M����.��Hr��U��d՟;���$���U��q[�vNӪب�IZ���JZ���[x�����o�$�U�5��u���%=���_��]b���|�UyF���Q���^ZU9�˪mIv��w������Z$�z�����(S�nU�U�Ľ��3�.o�AQ9kr� 'tc�֫��I&!$P�����T� ø��X�t͒,���Z jQ��A!Qc��ˍTTP�mT�����8���RYU�*��״iu� BQ�%٤)��*�L"��.u��D%���{5Uw��t�tI�-��G3X�Ҫld�*s�Skt N�I�2�r��ZTI['w*?e��>�� ��Rq�c�� c`1���@! The split disk can be in a wedge shape or a parallel disk type.