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Summary of Contents for Spirax Sarco 37D
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Page 1: Table Of Contents
1020026/7 IM-P102-04 CTLS Issue 7 37D and 37DE Temperature Controls Installation and Maintenance Instructions 1. Safety information 2. Installation 3. Start-up 4. Maintenance 5. Spare parts 6. Fault finding © Copyright 2018 IM-P102-04 CTLS Issue 7 Printed in GB... - Page 2 IM-P102-04 CTLS Issue 7...
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Page 3: Safety Information
Group 2 of the above mentioned Pressure Equipment Directive. The products’ use on other fluids may be possible but, if this is contemplated, Spirax Sarco should be contacted to confirm the suitability of the product for the application being considered. - Page 4 Spirax Sarco depressurisation valves type DV (see separate literature for details). Do not assume that the system is depressurised even when a pressure gauge indicates zero.
- Page 5 Customers and stockists are reminded that under EC Health, Safety and Environment Law, when returning products to Spirax Sarco they must provide information on any hazards and the precautions to be taken due to contamination residues or mechanical damage which may present a health, safety or environmental risk.
- Page 6 37DE The 37DE Spirax Sarco temperature control is supplied as for the 37D but a solenoid operated valve is fitted in the pipe between the pilot valve and the main diaphragm chamber, i.e. in series with the normal pilot valve.
- Page 7 Temperature control unit Control head securing screws Solenoid valve Fig. 1 37DE IM-P102-04 CTLS Issue 7...
- Page 8 2.2 General arrangement Fig. 2 shows the recommended installation layout to ensure satisfactory operation of the Type 37D and 37DE temperature control. It should always be fitted in a horizontal pipeline with the main diaphragm chamber below the line. 2.3 Pipeline sizing The piping on both sides of the valve must be sized so that velocities do not exceed 30 m/s (98 ft/s).
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Page 9: Installation
Steam Bypass valve Fullway valve Steam trap To process Fullway valve Strainer Strainer with 37D temperature control Sight glass blowdown cock Recommended installation Steam Fullway valve Strainer with blowdown cock Separator Steam trap Strainer Sight glass Fig. 2 Alternative installation fitted with a separator... - Page 10 2.9 Sensor bulb The type 37D control is fitted with a plain bulb as in Fig. 3, but as standard this bulb is supplied with an adaptor shown in Fig. 4, consisting of a union nipple (U), 'O' ring (V) and gland nut (W).
- Page 11 Fig. 7 Fig. 6 2.15 Wall mounting sensor Where the type 37D control is to be used to control from room temperature the plain bulb Fig. 3 is used and a bracket and protective shield is provided Fig. 7. It is essential that the sensor be fitted in such a position that it can sense the true room temperature and is not influenced by draughts.
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Page 12: Start-Up
3. Start-up When the valve is installed and the control system is fitted with the bulb in the medium to be controlled it may be brought into operation as follows. In most new installations dirt collects in the steam line during construction. It is always advisable to blow this out on initial start-up. -
Page 13: Maintenance
4. Maintenance 4.1 Routine maintenance It is recommended that the valve is dismantled once every twelve to eighteen months for a complete overhaul and ideally this should be carried out with the valve removed from the line. The parts that may require replacing or refurbishing are listed below: Main valve seat and valve head. - Page 14 To renew the pilot valve assembly Isolate the valve and zero the pressure. If the plant is still in operation through a bypass valve or if the medium surrounding the bulb is hot, withdraw the sensor bulb and allow it to cool down, otherwise the control system may be strained.
- Page 15 Remove the screen and clean. Ensure the main valve return spring is still in position. 10. Fit the new gasket. 11. Replace the screen. 12. Assemble the pilot valve housing and tighten the nuts to the torques shown in Table 1. 13.
- Page 16 To clean the strainer Isolate the valve and zero the pressure. If the plant is still in operation through a bypass valve or if the medium surrounding the bulb is hot, withdraw the sensor bulb and allow it to cool down, otherwise the control system may be strained.
- Page 17 To renew or clean the main diaphragms Isolate the valve and zero the pressure. If the plant is still in operation through a bypass valve or if the medium surrounding the bulb is hot, withdraw the sensor bulb and allow it to cool down, otherwise the control system may be strained.
- Page 18 To service or renew the main valve and seat Isolate the valve and zero the pressure. If the plant is still in operation through a bypass valve or if the medium surrounding the bulb is hot, withdraw the sensor bulb and allow it to cool down, otherwise the control system may be strained.
- Page 19 Table 2 Recommended tightening torques for main seat Size of valve Width across flats Tightening torque ½", ½" LC, DN15 & DN15LC 30 mm (1.18") (external) 110 - 120 N m (81 - 89 lbf ft) ¾" & DN20 36 mm (1.42") (external) 140 - 150 N m (103 - 111 lbf ft) 1"...
- Page 20 48. Thoroughly clean the lower diaphragm chamber making sure the contact faces are clean. 49. Replace the diaphragm plate and the push rod assembly and loosely fit the lower diaphragm chamber on two bolts either side of the union connection to locate the spigot in the recess. 50.
- Page 21 To renew the temperature control system Isolate the valve and zero the pressure. If the plant is still in operation through a bypass valve or if the medium surrounding the bulb is hot, withdraw the sensor bulb and allow it to cool. 60.
- Page 22 To service or renew solenoid valve (37DE) 68. Remove the retaining nut, washer and seal and slip the entire solenoid enclosure off the solenoid base and sub-assembly or plugnut/core tube sub-assembly. 69. Unscrew the bonnet or solenoid base sub-assembly and remove the core spring, core assembly and body gasket.
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Page 23: Spare Parts
5. Spare parts Interchangeability of spares The following table shows how in certain sizes some parts are interchangeable. For example in the line headed 'Main diaphragm' the diaphragm used in the screwed valves ½" and ¾" is common to these sizes by the letter 'a', the letter 'c' indicates that one diaphragm is common to the DN40 and DN50 valves. - Page 24 Always order spares by using the description given in the column headed 'Available spares' and state the size and type (37D or 37DE) of temperature control and whether it is screwed or flanged. Example: 1 - Main valve assembly for a DN25 Spirax Sarco Type 37D temperature control.
- Page 25 Note A split pin is fitted in this connector. If the latter is removed for any reason, it is essential that the split pin is retained and refitted. IM-P102-04 CTLS Issue 7...
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Page 26: Fault Finding
6. Fault finding 6.1 Preliminary procedure Before undertaking the following fault finding procedure, ensure the valve has been isolated and that upstream and downstream pressures are zero. Possible fault checks are given in a logical order below. 6.2 Temperature in plant too high 6.2.1 A rise in temperature above the normal control setting could be caused either by the valve failing to shut off or a breakdown in the control system. - Page 27 6.4 Temperature in plant too low 6.4.1 If the temperature in the plant is below the normal control setting this could be caused by one of the following: 6.4.2 Lack of steam supply. Check that the steam is turned on and that the strainers are clean. 6.4.3 Pipe assembly blocked.
- Page 28 IM-P102-04 CTLS Issue 7...
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