GATE VAVE FUNCTION Gate valve is characterized by a sliding wedge which is moved by actuator perpendicular to the flow direction. There are a variety of valve sizes and types. The valve is used primarily as a stop valve to open or close fully. Normally it works for slurries, viscous fluid, etc.,but not for throttling. The gate valve usually has a minimum pressure drop in full open and a tight seal in full close, and therefore there is little possibility that contaminants may enter the valve. BOY AN BONNET The body and bonnet is designed to achieve most uniform distribution of stress on all sides and minimum turbulence and resistance to flow. The bonnet on valve is equipped with back seat ring up to 1" for Class 150 & 00 and up to " for Class 00 or higher. The yoke is integrated with bonnet. BOYBONNET JOINT Bodybonnet joint of gate valve is machined as follows: Class 150... Plain faced Class 00 and higher class... Male and female We can supply any kinds of gasket as required by customer. WEGE The valve is normally supplied with a onepiece flexible wedge of which the cross section is a tapered shape. All wedges are fully guided. The flexible wedge is cast or machined with circumferential grooves to allow the seating faces to move independently and adjust the movement of body seat. It is used where the line load or thermal expansion of system may distort the seating face of valve, and especially uesful to prevent sticking that may happen in case the valve is closed at a hot temperature and opened at a cold temperature. Ideally the wedge is suitable for steam and other high temperature service. PK_1
SEAT RING The seat ring as a weldedin type is designed to prevent any turbulence and damage by corrosion. It is forged or rolled type into one piece for all dimensions, heat treated to obtain the desired surface hadness, and cleaned thoroughly before assembling. STEM The stem connection to the wedge shall have an integrated tee head (without welding)and is rectified in the packing area to ensure a long life and perfect tightness. Through experiments,we have calculated and checked the connections between stem and wedge not to disengage the stem from wedge while gate valve is working. The strength of stem and wedge connections is stronger than that of stem alone at the root of thread. PACKING The packing size is designed to secure maximum tightness along the stem, and the standard packing is a nonasbestos type. We can supply any kinds of packing as required by customer. YOKE SEEVE The yoke sleeve is designed to able to be disassembled without discounting bonnet and stem, and provided with ball bearing of 1" or over for Class 150 ~ 00 valve, "or over for Class 00, and " or over for Class ~ 1. GAN The gland is made of two pieces. Packing gland is in contact with the packing which is connected to gland flange through a spherical joint. Particular design permits a correct pressure on the packing without any damage to stem due to friction or corrosion. STUFFING BOX The stuffing box gives maximum packing stem seal. antern ring and grease injector shall be furnished only if specified on the purchase order. AN WEES and wheels are designed for easy operation. With gearing, motor actuator or cylinder actuator, it is also available for more difficult services. BOTS AN NUTS Bolts and nuts are made from four different types of steel materials in conformity with the ASTM specification: 1) A07 Grade B : It has a minimum tensile strength of 55,000 pounds per square inch (70kg/ mm ). The nuts normally used with machine bolts are a hot pressed steel conforming to ASTM specification A07, which is usually applied to hinge bolts and nuts. ) A19 Grade B7/B : It usually retains the strength well at an elevated temperature and offers higher resistance to creep than any other high grade steel used as bolting materials. This steel is regularly used in bonnet bolts. ) A19 Grade / : The nuts of this grade shall be reheated above the critical range of steel, quenched in a suitable medium, and then tempered at a temperature not less than 50 F(55 C). This steel is regularly used in bonnet nuts. ) Carbon steel : It is used in hand wheel nuts, set screws, or nipples. PK_1
EN CONNECTIONS In our standard production of valve, the flange ends(rf.ff) and the face to face dimensinos conform to ANSI B.5 and ASME B., respectively, and they have a raised face serrated finish type or other finish type as requested. For buttwelded ends (B.W.), of which the end to end dimension conforms to ASME B., customer must specify the schedule type required, pipe class, or bore diameter. Ring type joint flanged ends (R.T.J) conform to ASME B.5 and the end to end dimension follows ASME B.. The other special end connections may be supplied as required by customer. GEAR OPERATE VAVE Valve can be supplied with gear operators. MOTOR OPERATE VAVE Valve can be supplied with actuators, either electric or pneumatic, accordings to customer s requirements. ACCESSORIES We can supply a valve fitted with accessories such as bypass, locking device, chain wheel, extension stem, etc. For more details, refer to the Accessories column. PACKING AN GASKET MATERIAS Packing material supplied in standard valve is nonasbestos graphite, with braided graphite rings and dieformed rings configured to provide reliable and longlasting performance. Braided rings are coated with zinc dust to inhibit corrosion. ieformed rings are 9% carbon(minimum)and have maximum 50PPM chloride 550PPM sulfur content. For standard valve, gasket materials are as follows; Class 150 graphite sheet type with 0 stainless steel tanged insert. (1.mm minimum overall thickness) Class 00 spiral wound 0 stainless steel and graphite. Class 00 same as class 00 or Class and 1 Ring type joint SEA AREA ESIGN Cast steel valve are designed and manufactured to satisfy strict requirements in order to prevent external leakage and to meet fugitive emission requirements of most customers. Stuffing box finishes of to 15 RMS, stem finishes of to RMS, control of straigntness and concentricity of stems, and controlled diametrical clearances between stem and gland, stem and backseat, and gland and stuffing box, all combine to quarantee consistent performance of stem seals. Gasket surfaces between bodies and bonnets are strictly controlled to finishes of to AAR. When combined with engineered bolting design, quality materials and strict assembly procedures, these finishes quarantee consistent sealing in gasket areas. PK_15
ø ø1 (OPEN) 1 GOV (GEAR OPERATE) (RF), 1(BW) EN CONNECTION R.F FANGE ENS TO ASME B.5 B.W. ENS TO ASME B.5 R.T.J FANGE ENS TO ASME B.5 " AN ARGER, FANGE ENS ACCORING TO ASME B.7 SER.A OR SER.B STANAR MATERIA SPECIFICATIONS NO PART NAME MATERIA 1 5 7 9 11 1 1 1 15 17 1 19 0 1 BOY BONNET WEGE STEM AN WEE BOY SEAT RING BACK SEAT RING GASKET PACKING GAN FANGE INGE BOT INGE NUT INGE PIN PACKING GAN BONNET BOT BONNET NUT YOKE CAP YOKE SEEVE ANE NUT SET SCREW NIPPE GEAR BOX STEM COVER A WCB A WCB A17 CA15 + ST A79 A57 0 + ST A79 A5 A07 B A19 A57 0 A57 0 + Cr A19 B7 A19 A57 0 A9 C A7 5 + Zn STEE STEE + Cr UCTIE IRON A5 A17 WC A17 WC A17 CA15 + ST A79 A1 F11 + ST A79 SPIRA WOUN / GRAPITE+0+0 GRAPITE+GRAPITE WIT INCONE WIRE A5 A07 B A19 A57 0 A79 A19 B A19 A57 0 A9 C A7 5 + Zn STEE STEE + Cr UCTIE IRON A5 A51 CF A51 CF A51 CF + ST A79 0 A0 0 + ST A79 0 A51 CF A19 B A19 A79 0 A79 0 A19 B A19 A57 0 + Zn A9 C A7 5 + Zn STEE + Cr STEE + Cr UCTIE IRON A5 PK_
IMENSION AN WEIGT CASS 150 1 1 177. 15.9 00 9 0.. 1 9. 0. 55.7 0. 15 75 950 7 9.1 19.1 97 71 1 0. 57. 00 115 17 1. 50 117 1 1 1.0 571.5 1550 5 0. 09. 50 1 55 1 1. 0. 1 05 0 57. 711. 50.0 1. 0 17 55. 950 155 09. 7 05 1777 0 09. 0 119 CASS 00 1 1 15.9 15.9 00 0.. 1 0. 0. 5 59 0. 0. 75 95 119 19.1 19.1 00 951 7 19 57. 57. 50 11 19 91 1 15 170 1 7.0 7.0 50 1 9 7.. 9 19 7 1 91. 91. 1909 05 1 0 990. 990. 119 7 1 11.0 11.0 9 7 5 1. 057 0 1. 5 50 0 197 75 17 CASS 00 1 1 9.1 9.1 00 9 5.. 75 1. 1. 591 1 55. 55. 50 01 995 0. 0. 05 1 05 77. 77. 119 1.. 05 7 1 9.0 9.0 179 15 990. 990. 079 190 1 9. 9. 0 1 0 119. 119. 197.0 197.0 70 9 17. 00 7 159. 5 559 0 51 0 9 CASS 1 1.. 7 7 1.0 1.0 7 57. 57. 71 159 09. 09. 95 111 1 7. 7. 190 1 5.. 151 15 90 1 95. 95. 17 1 1.7.7 179 1. 1. 1955 1 119. 119. 0 05 0.. 50 159. 159. 9 500 CASS 1 1 1.. 7 1 9.9 9.9 0 11 5.1 5.1 00 70 0 7 70.9 70.9 50 9 1 515 1.9 1.9 5 150 99 990. 990. 11 1570 0 1 1. 1. 1 57 1. 9 19 1 555 PK_17 PK_17