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Table of Contents
Summary of Contents for CARRARO CS Series
- Page 1 I N S T R U C T I O N S For installing and servicing safety spring valves series CS types 50 - 51 80 - 91 IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452...
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Page 2: Table Of Contents
Operating problems....................24 Periodic safety valve inspections................25 Troubleshooting....................26 Maintenance......................26 Reassembling safety valves ................. 31 Repairs......................... 32 IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452 Page 2 of 32... -
Page 3: General Information
CS 91 valves may be with or without a lever and may have a resilient tightness disc. Each valve is marked with the following alphanumerical code: = Carraro Sicurezza 50-80 = Valve with unsealed frame 51-91 = Valve with sealed frame... -
Page 4: Cross-Section Drawing Of Cs 50 Fig.1
CS types 50 - 51 80 - 91 Fig.1 – CS 50 safety valve N.B.: Items (29, 30, 31 and 32) are only available as a set IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452... -
Page 5: Cross-Section Drawing Of Cs 51 Fig.2
CS types 50 - 51 80 - 91 Fig.2 – CS 51 safety valve N.B.: Items (39, 40, 41 and 42) are only available as a set IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452... -
Page 6: Cross-Section Drawing Of Cs 80 Fig.3
CS types 50 - 51 80 - 91 Fig.3 – CS 80 safety valve N.B.: Items (31, 32, 33 and 34) are only available as a set IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452... -
Page 7: Cross-Section Drawing Of Cs 91 Fig.4
CS types 50 - 51 80 - 91 Fig.4 – CS 91 safety valve N.B.: Items (41, 42, 43 and 44) are only available as a set IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452... -
Page 8: Safety Indications
3) CAUTION – Risk or hazardous behaviour which may cause minor injury. 4) ATTENTION – Risk or hazardous behaviour which may cause damage to property. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452... -
Page 9: Safety Warnings
Given the large number of conditions and circumstances that may arise while working on the products and the consequent risks deriving from the way this is done, CARRARO is not able to prevent all risks of injury to people and damage to property and can only help by asking you to take the utmost care and giving you the following safety suggestions. -
Page 10: Safety Precautions
° Inspect/service the safety valve at least once a year. ° Please consult CARRARO before working on valve parts. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it... -
Page 11: Safety Valve Terminology
14 - Popping pressure – This is value of increasing static inlet pressure at which the disc opens at a much higher speed than at higher or lower pressures. Popping only occurs in safety valves applied to compressible fluids. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03... - Page 12 23 - Simmer – This is the audible or visible leak of fluid between the seat and the disc at an inlet static pressure which is lower than popping pressure and with an non-measurable rate of flow. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it...
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Page 13: Transport, Storage And Handling
ATTENTION! When handling the valve, make sure the work area is kept clear in order to prevent injury to people and damage to property IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452... - Page 14 During lifting to the installation point, take care not to knock the valve against the metal structure or other objects. ATTENTION! If the valve is knocked violently, have it checked by CARRARO before installing it. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it...
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Page 15: Limits To Use
CS types 50 - 51 80 - 91 LIMITS TO USE 9.1 The Carraro CS 50-51 80-91 safety valves were not designed for use with cyclical loads. 9.2 Valves in non-alloy or low-alloy steel, for service in excess of 371 °C, and valves in alloy steel for service in excess of 510 °C have been used without faults at temperature gradients of up to 150°C/h;... - Page 16 These are capable of destroying the seats the first time the valves open. The system must therefore be carefully cleaned before starting to install safety valves. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03...
- Page 17 Safer results are obtained if hoses are installed to allow movements by bending rather than by stretching or axial compression. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452...
- Page 18 This pipe must also be perfectly flexible so as not to apply force on the valve under any operating conditions. Before completing installation, make sure nothing obstructs the movement of the lifting lever. Flanged valves can be installed without the need for insulation. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452...
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Page 19: 11. Determining Reaction Forces
The values of the forces indicated refer to valves installed according to this CARRARO use and maintenance manual. IMI0022E.doc CARRARO S.R.L. -
Page 20: Valves Installed Outdoors
(see figs. 2-4) (see figs. 2-4) ATTENTION! Only use the stop screw when testing pressure is not less than 80% of calibration pressure. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452... - Page 21 2. Pull out the pin (13) and the lever (16) 3. Loosen the cap screw 4. Pull out the cap (15) Then fit the stop screw with bracket to the frame (11) (Fig.8) IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452...
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Page 22: Starting
! WARNING Block the valve with the stop screw when adjusting the rings in order to eliminate serious risks of injury or death IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452... -
Page 23: Calibration
Check the adjustment in operating conditions. 15.6 – Calibrating the CS91 valves without lifting lever (Fig.4). Remove the seal, if present. Remove the cap (16), adjust and check as indicated above. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452... -
Page 24: Blow Down Adjustments
A larger leak, instead, indicates that the seat is damaged. Continuous leakage may also occur at normal operating pressure which is considerably lower than the closing pressure of the valve. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03... -
Page 25: Periodic Safety Valve Inspections
ATTENTION! Move the lever at a safe distance from the valve; do this by using a piece of string tied to the hole of the lever. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452... -
Page 26: Troubleshooting
DROP BY LESS THAN HALF THE THE INLET PIPING REQUIRED BLOW-DOWN CHECK THE SIZE OF THE VALVE INCORRECT VALVE DIAMETER IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452... -
Page 27: Maintenance
To separate the disc from the rod catch the internal thread by turning the disc anti-clockwise. Do not change the position of the adjusting ring (3) unless repairs have to be made to the seat of the nozzle (2). IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03... - Page 28 If the indentations in the seat or the disc are such as to require lapping deeper than 0.25 mm, return the valve to Carraro for repairs unless you have a workshop fitted out for this kind of work. Bear in mind that when turning, all the profiles must be perfectly reproduced, otherwise the safety valve will not work correctly.
- Page 29 If the resilient gaskets of the disc are marked, hollowed or in any way deteriorated, replace them by means of a simple and clear operation (See details in Figs. 1 and 4). IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it...
- Page 30 It is therefore essential to check and service the surface of the spring in order to keep the safety valve in perfect working order. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03...
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Page 31: 21 - Reassembling Safety Valves
21.2 Assembly valves without lifting lever by carrying out the operations indicated in paragraphs 20.2.3 pos.1 and 2 in reverse order. 21.3 Checking the gaskets. When reassembling, check the existing gaskets are in perfect working order and replace if necessary. IMI0022E.doc CARRARO S.R.L. 20090 SEGRATE (MI)- via E.Fermi E-MAIL: info@carrarovalvole.it Rev.5 30/06/03 VALVOLE E STRUMENTAZIONE TEL.(02) 269912.1 - FAX.(02) 2692.2452... -
Page 32: Repairs
ATTENTION! The external adjustment devices of all safety valves are sealed. Immediately prior to delivery, the valves are sealed by CARRARO or the control body. These seals must be applied so that the valves cannot be adjusted without breaking them. The unauthorised breakage of seals will make the guarantee null and void.
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