excellence of Italian engineering Field adjustable PRESSURE RELIEF VALVES

Transcription

1 excellence of Italian engineering Field adjustable PRESSURE RELIEF VALVES

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3 excellence of Italian engineering OUR MISSION: We started in 1960 as instrumentation manufacturers and we have increasingly specialized in high quality valves. Italian know-how and production, combined with qualified European suppliers, make Sami the excellence of Italian engineering. 3

4 WHAT: Relief valves are devices which protect the system from overpressure by draining the fluid when the pressure exceeds a set value. HOW: The valve OPENS when the pressure exceeds a set value and CLOSES when it falls below. Normal state: Force of pressure on stem force of pressure of spring = CLOSED Overpressure: Force of pressure of system force of pressure of spring = stem lifts and valve OPENS The set pressure is easily adjusted by the customer by turning a screw on the top of the valve Please note: Sami s pressure relief valves are unidirectional, are not to be plugged or plumbed in series and must have an independent exhaust to atmosphere. WHERE: Relief valves are used: in systems or containers where it s important to protect the equipment from overpressure; with high or low temperature fluids; to control overpressure caused by heat expansion of a fluid; where the low drain rate in high pressure systems isn t a critical factor; where a bubble tight seal is requested. 4 WHERE NOT: NOT to be used: below psi (69 bar); in systems where the relief valves must have a capacity rating at a given pressure rise: our product is designed to open gradually when the pressure increases; in systems with ASME Boiler and Pressure Vessel Code or 97/23/EC standards: our relief valves do not comply with ASME or PED standards; where back pressure during drain may occur; with corrosive fluids or liquid nitrogen, which, in the expansion phase, could generate cryogenic temperature gas, damaging the valve.

5 MAIN FEATURES: Field adjustable set pressure can be set in factory and readjusted in the plant, if needed Long life thanks to soft seat and strong coil springs High accuracy designed to control minor overpressure Fast response thanks to a simple structure, with few mechanical components Easy to use all you need is a screw to adjust the set pressure Easy maintenance with few spare parts and easy-to-reach seat Bubble tight thanks to soft seat based on a tilt angle CODING SYSTEM: SERIES R10 RELIEF VALVE psi R20 RELIEF VALVE psi TYPE M01 SCREW ADJUSTABLE RELIEF VALVE - SOFT SEAL - ORIFICE 0,07 SIZE T01 1/4 C&T T11 1/4 NPT T02 3/8" C&T T12 3/8 NPT T03 9/16 C&T MATERIALS A Aisi 316 (standard) R10 M01 T01 A Other materials available upon request. 5

6 TECHNICAL FEATURES: Inlet NPT-F: 1/4 3/8 ; C&T: 1/4-3/8-9/16 female Outlet 1/4 NPT-F From to PSI ( bar) for model Design and set pressure R10M01*** From to PSI ( bar) for model R20M01*** Cv/Kv 0.12 / 0.10 Full rate Overpressure: 10% higher than set pressure (approx. 5mm opening) Working temperature Standard -46 C /+150 C (-50 F/ +302 F) Body material AISI 316 Packing material Nylon or PTFE O-rings material FKM Orifice 1.8 mm (0.07 ) Standard testing Shell test at 1.5 x rating - medium: water Seat test at set pressure - medium: water Certificate included (free of charge) EN Set pressure adjustment 100% in plant or in factory Medium to be used Water or gas SET PRESSURE: Spring compression R10M01T11 R20M01T01 % h-mm (inch) Psi (bar) Psi (bar) 5 2,6 (0,10 ) (133) (274) 15 7,6 (0,30 ) (400) (821) 25 12,7 (0,50 ) (668) (1368) The upstream pressure at which the first indication of flow occurs determines the set pressure. The table above shows the set pressure which can be reached by compressing the internal spring at a given height h. The maximum set pressure can be reached at approximately 25% of the total spring length. The values are to be regarded as an indication and refer to working conditions at room temperature (-29 C + 38 C / -20 F F). A tolerance value of ±10% must be considered. H 6

7 TABLE OF MATERIALS: PART DESCRIPTION MATERIAL 1 Upper thrust washer ASTM A276/A Thrust bushing PTFE 3 O-ring 2032 FKM Endura V91A 4 Bottom thrust washer ASTM A276/A Bottom spring AISI Shutter AISI A564 T630 H900 7 Bushing ASTM A276/A Seat Nylon or PTFE 9 Socket set screw 1/2 UNC x 2 ASTM A193 GR. B8M 10 Hexagon low nut 1/2 UNC-2H ASTM A194 GR. 8M 11 Upper fitting ASTM A276/A Upper spring bushing ASTM A276/A Springs Carbonsteel 14 Lower spring bushing ASTM A276/A Valve body ASTM A276/A O-ring 2050 FKM Endura V91A 17 Closure fitting 1/4 NPT-F ASTM A276/A Parts marked in BOLD are the ones included in the repair kit * 17 REPAIR KIT CODES: Valve code R10M01** R20M01** Repair kit code KR10M01** KR20M01** 1* 3* 2* 4* * 7

8 OVER 50 YEARS OF SUCCESS: SAMI INSTRUMENTS S.r.l. Via Botte, 8 - Reschigliano di Campodarsego Padova (Italy) Tel info@samivalves.com