AST CV-8000 Control Valve
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CONTROL VALVES

PRODUCE ED ESPORTA IN TUTTO IL MONDO DAL 1951 ½ Valvole di Sicurezza a Molla ½ Valvole di Regolazione a Comando Pneumatico ½ Raccordi ad “Y” con Valvola Deviatrice (per coppie valvole di sicurezza) ½ Valvole Rompivuoto MANUFACTURES AND EXPORTS ALL OVER THE WORLD SINCE 1951 ½ Spring Loaded Safety-Relief Valves ½ Pneumatic Control Valves ½ Change-Over Valves (for Couple of Safety Valves) ½ Vacuum Release Valves ½ Banchi di Taratura Valvole di Sicurezza ½ Safety-Relief Valves Test Benches POLITICA DELLA QUALITÀ QUALITY POLICY , attraverso il proprio Sistema di Qualità certificato UNI EN ISO...

BASIC FEATURES Body thicknesses and joints according to ASME/ANSI B16.34. Valve face to face according to IEC 534.3. Valve flanges according to ASME/ANSI B 16.5 ISO 2084 (DIN - UNI). Spherical bodies with special internal shaping maintain low fluid velocities for minimizing erosion. Appropriate plug profile guaranties the correct flow caracteristic. Packing box construction bolted flange type. Yoke made of carbonsteel for maximum strength and rigidity. Diaphragm case steel construction guaranties lightness with high mechanical strength. Diaphrams are neoprene or silicone rubber or viton...

DIAPHRAGM ACTUATORS Figure 2-1. Direct actuator

DIAPHRAGM ACTUATORS 9 - 9R Effective Area Max travel Diameter cm2 sq.in. mm inches mm inches mm Height inches kg Weight pounds Type 8100 8300 Type 8200 Type 8400 Type 8700 (1) also available is actuator type 24 - 24R with a travel of 100 mm (3.94”). (2) valve - actuator standard coupling, larger actuators can be mounted.

DIAPHRAGM ACTUATORS manufactures a complete range of spring-diaphragm actuators designed for all the valves of its production. These actuators are also suitable for application to a wide range of sliding-stem valves. A range of five direct-acting actuators and five reverse-acting actuators is available. Direct-acting actuators in which the extended position of the stem is held by the air pressure. The spring pushes the stem in the retracted position. Fail-open action is assured for push-down-to-close valves while fail-close position is assured for push-down-to-open valves. Reverse-acting...

DIAPHRAGM ACTUATORS Connection to valve stem is assured without clearance thus assuring accurate valve positioning. Response time and air consumption are minimised since case volume is reduced to a minimum for actuator’s operation. A variety of accessories is available for a any applications (handwheels top and side mounted, solenoid valves, limit stop, boosters, lock-up valves, etc.). Positioners of any type can be mounted on the actuator upon request (pneumatic, electro-pneumatic, digital, digital with Hart protocol). Air connections are 1/4” NPT-F as a standard size, upon request 3/8”...

VALVE BODIES Figure 5-1. Type 8200 - double seated

VALVE BODIES Globe - Single Seated Invertible Body Globe - Double Seated Invertible Body Three-Way - Combining Three-Way - Diverting Globe - Single Seated Non-invertible Body

The Following table shows the standard materials of construction used by shown on the table can be used by depending on customer’s needs. . Other materials than S TA N D A R D M AT E R I A L S O F C O N S T R U C T I O N VALVE MATERIAL CODE Pos. 9 Fig. 5-1 5,12 Fig. 5-1 Bonnet & Bottom Flange Body Studs Body Nuts Packing Flange Packing Flange Studs Packing Flange Nuts Guide Bushing Plug & Seat Ring Plug Stem Packing Follower Body Gasket Adjusting Screw ASTM A105 (direct actuators) AISI 410 (reverse actuators) Actuator Spring Carbon Steel (52SiCrNi5 or 50CrV4) with protective coating...

The Following tables shows the suggested temperature limits for some of the most common materials. Temperature ranges shown on the tables are representative of the uses established by and refer to this catalogue. Every material may be used for a wider range of temperatures and moreover specific experience leads to fit these limits for every industrial process. The ASME/ANSI B16.34 standard establishes pressure/temperature limits for the valves flanges depending on the materials of construction. (*) If stellited; without stellite max 315°C. To analyse the use of other materials than shown on...

Fig. 6-4. Teflon packing Graphoil Packing Fig. 6-5. Packing with Lubricator Fig. 6-6. Bellows Seal Bonnet For hazardous mediums up to 35 Kg/cm2 and 200°C Bellows materias is 316L or Monel BONNET AND STEM PACKING Bonnets are manufactured from forging or bars and may be supplied of the standard, extended or finned type. The choice is done by depending from working temperature: ½ standard: from -30°C to +250°C. ½ extended: from -70°C to -30°C and from +250°C to 350°C. ½ finned: over 350°C. ½ customized extension: below -70°C. Stem packing is done with teflon rings (up to 200°C) or graphite...

PLUG TYPES FLOW CHARACTERISTICS Seat actual diameter [mm] “Rangeability” V-Port 50:1 Contoured 30:1 Seat nominal diameter [inches] Disk Fig. 7-3. Quick Opening Fig. 7-4. Tipical flow curves

Available side handwheels: Type 300 for actuator sizes 11 and 13. Type 450 for actuator sizes 15 and 18. These handwheel tipes may be fitted on direct or reverse actuators and may also be used as limit stop. Continuosly connected worm gear drive handwheel are available for valve size 12” and lager. Fig. 18-1. Side Mounted Available top mounted continuosly connected handwheed: Type 160 T for actuator sizes up to 13 This handwheel type may be fitted on direct or reverse actuators and may also be used as limit stop. Fig. 18-2. Top Mounted Available operated handwheel: Type 160 H for valve...

SHIPPING WEIGHTS A P P R O X I M AT E S H I P P I N G W E I G H T S ( K g ) VALVE TYPE Valve Size (inches) Extra for Finned Bonnet Remark: For ANSI 900, 1500, 2500 rating valves please contact

The valves type 8100 have a globe body of the invertible type, single seat, top and bottom guide. Double guiding reduces vibration and guarantees a more stable flow regulation. The seat is screwed on the body. From 3/4” to 10” (see table below). Up to ANSI 600 (PN100). Higher ratings are available, consult According to ASME/ANSI B16.5; DIN, UNI, AFNOR and others are available. Bonnet is available in the standard, extended or finned construction (see page 9). Tightness class: The standard class is IV; class V and class VI with soft seat are available upon request. Body Materials: Bodies are...