Butterfly valves - Main features • Corrosion and abrasion resistant only the seat and disc are in contact with the fluid. • Self - cleaning and two - way (therefore the valve can be mounted in both directions of flow). • Seat with metallic support ring to ensure geometric and dimensional stability. • Disc self - centering inside the seat thanks to the floating coupling between stem - disc. • Stem-disc coupling without use of fastening elements (screw, bolts, etc.) which could be sources of corrosion and failures. • Disc of special design in order to ensure ample full flow, low pressure drops, and minimum turbulence. • Valves are according to ISO 5752 - BS 5155 - MSS SP 67 DIN 3202 - 3 - K1 - API 609. • Maximum ease of assembly and maintenance: no additional seals are required for mounting between the flanges, nor lubrication. • Adaptability to any type of pneumatic or electric actuator. • Protection of the valve outer parts against corrosion (epoxy or polyurethane paint). • Good adjustment characteristic • Tight shut-off with pressure drop up to 21.5 bar. • Favourable cost. • Very compact size and light weight.

1. The upper stem is locked by manual or motorized control while the O-ring assures a life-time lubrication. Moreover, a mark is machined on the top part of the stem, which reproduces exactly the disc position, when the valve is inserted between the flanges.

2. The one - piece valve body casting ensures high strength with minimum weight. It can be supplied in a wide choice of materials, for both WAFER and LUG models, so as to meet all possible installation requirements.

3. Thanks to the special internal profile of the surface of contact between disc - seat, the reciprocal back pressure ensure tight shut-off

4. The stem has a square and which fit directly in the disc; hence no fastening elements are needed. This allows the disc to float on the stem and to be self-centering inside the seal so as to form a continuous tight shut-off line with the latter. Thanks to the special shape of the disc, pressure drops and forces of rotation are appreciably reduced.

5. The resilient seat is vulcanized on a rigid metallic support ring. Thanks to its straight-forward design it is easily replaceable without use of special tools.

6. Thanks to the special profile of the seat, no seal is required between the flanges.

Butterfly valves Series 301-302 - materials of construction

DN 40 ÷ DN 300 (11/2 " ÷ 12") series 301 DN 350 ÷ DN 600 (14" ÷ 24") series 302

ITEM DESCRIPTION MATERIALS COMPLYING WITH

1 BODY

Grey iron G. 25 Ductile iron GS400/12 Carbon steel Fe G. 45 VR Stainless steel - X5 Cr Ni Mo 1713 Al/Bronze G-CU AI 11 Fe4 Ni4 Aluminium G-AI Si13

ASTM A48-40B ASTM A536 grade 65-45-12 ASTM A216 WCB ASTM A351-CF8M ASTM B 148-GR. 955 ASTM B275

2 + 3 UPPER AND LOWER STEM

Stainless steel - X12 Cr S 13 Stainless steel - X 5 Cr Ni Mo 1712 Stainless steel 17-4 PH Hastelloy C Monel K Titanium

416 SS ASTM A 47-TYPE 316 ASTM A 564-TYPE 630 ASTM B 574 ASTM B 164-58 ASTM B 348 Gr. 5

4 + 5 O' - RING Buna N / Viton -

6 + 7 + 8 BUSHING Bronze -

9 SPACER Carbon steel -

10 SEAL Buna N / Viton -

11 PLUG Carbon steel -

12 DISC

Grey iron G. 25 Ductile iron GS. 400/12 Forged carbon steel Carbon steel Fe G. 45 VR Forged stainless steel Stainless steel - X 5 Cr Ni Mo 1712 Al/Bronze G-CU A 11 Fe4 Ni4 Hastelloy C Titanium Rubber/coated Polvders/coated Niplpy process

ASTM A48-40B ASTM A536 grade 65-45-12 ASTM A 105 ASTM A216 WCB ASTM A182 F316 ASTM A351-CF8M ASTM B148-GR.955 ASTM A 484 ASTM B 348 Gr. 5 EPDM-Buna-Viton ecc. Rilsan-Halar ecc.

13 SEAT

Buna N- EPDM - EPDM H.T. - Natural rubber -Neoprene Hypalon - Viton - Silicone

PTFE

ASTM D 2000

ASTM D 1437-73

NOTE: Special materials are available on request

Butterfly valves series 301-302 - Installation and maintenance instructions

Installation The SIRCA butterfly valves are two - way which means they can be mounted with flow on either side. The valves are designed for installation between DIN or ANSI flanges. They are seated between these flanges without need for seals of any kind. They can be mounted in any position in the piping: if necessary with the small and medium sized valves, the actuators can face downwards without alterating the interference between disc and seat. Before mounting the valve between the flanges, it is advisable lo apply a film of silicone grease on the outer surfaces of the seat in contact with the fianges. This is to avoid seizing up with the mounting flanges and risk of tearing or breakage when disassembling. After placing the valve with disc half open (water type) between the flanges, proceed to center it between the letter. Next insert the tie - rods which extend right along the outside of the valve body. Then thread the nuts on the tie-rods and tighten them uniformly. In the case of the LUG type valves, the bodies are fitted on the outside with lugs having tapped or through holes coinciding with the holes on the flanges , therefore installatíon with bolts is quicker and easier. After assembly it is advisable to open and close the valves several times in order to make sure everything is OK. lt is good practice not to install the valve close lo elbow fittings or branches in the piping, especially upstream, in order not to impair the hydraulic behaviour of the fluid or to cause needless stress on the valve. The flanges (better still if with neck or socket) should be perfectly parallel with well machined surfaces; the inner and outer diameters should correspond to those given in the table. If the flanges are not parallel or not well machined, they would cause abnormal stress on the tie-rods thereby causing poor tightening with the seat. Consequently the disc movements would cause rapid wear of the seat. Moreover correct inner and outer diameters of the flanges are very important for correct valve operation. If the diameters are too small (see fig.A), they could prevent valve movement. Too large diameters, instead, (see fig.B) would not allow sufficient tightening of the seat, therefore a non-perfect tight shut-off to the outside. The ideal solution is illustrated in fig.C where the flange inner diameter is equal to valve port. .

Maintenance No maintenance and/or periodic lubrication is required. The various component parts of the valve can be inspected or removed quickly using normal tools. To do so, close the valve; then remove the tie-rods or bolts from the flanges and slip the valve off the piping. .

Disassembly and reassembly First fully opern the valve. Remove the lever system or operating mechanism fitted on the valve. Then screw out plug (11) remove seal (10). Lift out the top stem (2) followed by the lower stem (3). Force the disc (12) out from the seat (13). Then seat together with the stem O-rings (4). Inspect and/or replace the parts where necessary, then reassembly all items in the reverse order to assembly. Reassembly is greatly helped by smearing small amounts of silicone grease inside the valve body and ori the two stems. Lastly make quite sure of perfect alignment of the square end of the upper stem with the broaching on the disc. There is risk of demage if repeated use of force is made when inserting the stems in the case of holes on the seat not being properly aligned with those on the valve body and disc. . Spare parts Normally the valves are supplied with the disc open by a few degrees and they should be installed in the position on the piping. After tightening all the tie-rods or bolts, perform a few opening and closing maneuvers to make sure there are no assembly faults as mentioned above. If everything is OK, the valve can operate for very long periods without requiring inspection or spare parts. The only recommended spare parts for SIRCA valves are the rubber ones; i.e. the seat on the valve body (item 13) and the stem O-rings (items 4-5).

Butterfly valve with PTFE seat and Stainless Steel AISI 316 disc (Sirca series 301/TSS)

Main fields of application

• Pharmaceutical industries • Chemical industries • Food industries • Breweries • Distilleries • Paper mills

Foreword

This is a new series of butterfly valves with perfectly tight shut-off designed to solve, unlike the valves with elastomer seats, problems in shut-off and/or flow control for particularly aggressive fluids. Hence this type of valve finds its main application in those industrial sectors, above all the chemical and pharmaceutical industries, where there is an intensive use of more or less corrosive products. Another ideal application is that of the sector of foodstuffs in general, breweries and distilleries, thanks to the non toxicity and to the antiseptic characteristics of the PTFE seat. As this seat fully isolates the valve body from the process fluid, special materials of construction are not necessary; moreover thanks to the special external profile, the valve is kept ready for mounting without needing additional seals. The seat consists of a vulcanized PTFE layer, 2mm thick, on a resilient elastomer support inside of which is housed a metal ring to ensure both geometric and dimensional stability of the seat. The standard version of the inner parts, i.e. the disc and stem, is AISI 316; it is also possible to supply the disc mirror-polished. Other materials such as MONEL K, HASTELLOY C, TITANIUM, are

Butterfly valve with PTFE seat and Stainless Steel AISI 316 disc (Sirca series 301/TSS)

Specification - manufactured in diameters from DN40 to DN300; - operating temperature: -20°C to +130°C; - designed in agreement with ISO 5725 - BS 5155 - API 609 - MSS SP67 - DIN 3202-3-K1; - self cleaning and bidirectional (i.e. can be mounted in either direction of flow); - top coupling flange in accordance with ISO 5211/1; - mounting between flanges UNI-ISO-DIN-PN6-PN10-PN16-ANSI 150RF; - perfectly tight shut-off with differential pressure up to 10.5 bar and vacuum down to 102 TORR; - outer valve parts protected against corrosion (epoxy or polyurethane paint); - can be actuated by a 10 position leverlock handle-irreversible reduction gear with handwheel-pneumatic actuators-electrical actuators, etc. . Design features - the one piece cast valve body ensures high strenght and light-weight. It can be supplied in a vast range of materials, both in the Wafer model with 4 centering holes to facilitate mounting between flanges and the Lug models with drilled and/or tapped lugs in order to cater for all installation requirements; - self-centering disc inside the seat through the floating stem-disc coupling; - stem-disc coupling free from fastening elements (screws, bolts, etc.); - disc designed to ensure generous full flow, low pressure drops, minimum turbulence; - the seat consists of a 2mm thick vulcanized PTFE layer on elastomer support whose elasticity is such as to ensure a perfectly tight shut-off of the valve; - the upper stem is locked by the manual operator (lever, gear) or by the actuator (pneumatic, electric) while the O-ring features life-long lubrication. The top part of the upper stem is milled to exactly mark the disc position when the valve is inserted between the flanges. An adjustable ring nut and stem guide bushing respectively ensure double seal and anti-seizing and of the upper stem; - tight seal of the lower stem is through a hexagonal plug with internal PTFE O-ring.

Butterfly valve with PTFE seat and Stainless Steel AISI 316 disc (Sirca series 301/TSS)

Overall dimensions

Overall dimensions Top coupling flange in accordance with

ISO 5211/1 Weight

Size A B C D E øF G H I L M Type øN øO øP Q Kg. 40 1 1/2" 90 92 96 41 229 90 12 15 33 46 67 F07 70 8,5 55 3 2.5 50 2" 102 98 109 41 248 90 12 15 43 56 79 F07 70 8,5 55 3 2.7 65 2 1/2" 122 108 122 41 271 90 12 15 46 71 92 F07 70 8,5 55 3 3.3 80 3" 135 118 131 41 290 90 12 15 46 83 108 F07 70 8,5 55 3 3.7 100 4" 162 132 152 41 325 90 12 15 52 105 134 F07 70 8,5 55 3 5.2 125 5" 194 150 177 41 368 90 16 15 56 128 161 F07 70 8,5 55 3 7.3 150 6" 220 165 193 41 399 90 16 15 56 153 190 F07 70 8,5 55 3 8.8 200 8" 274 194 225 41 460 90 16 15 60 198 240 F07 70 8,5 55 3 10.4 250 10" 330 220 274 41 535 125 18 15 68 237 294 F10 102 11 70 3 21.3 300 12" 386 262 297 41 600 125 18 15 78 288 345 F10 102 11 70 3 31.5

.