Table of Contents
Advertisement
Quick Links
ZETKAMA Sp. z o.o.
ul. 3 Maja 12
PL 57-410 Ścinawka Średnia
SPRING-LOADED
SAFETY VALVES
zARMAK
TABLE OF CONTENTS
1. Principle of operation
2. Delivery condition
3. Installation of safety valves
4. Operation of safety valves
5. Adjustment of the set pressure
6. Maintenance and repair of safety valves
7. Operating disturbances and their elimination
8. Warranty
1. Principle of operation
The purpose of the safety valve is to protect the equipment and installations against excessive pressure above
the pressure limit.
When the force coming from the pressure acting on the disc surmount with the force from the spring, the valve starts
to open. A further increase in the pressure, required for the particular design of the valve, causes its full opening aided
by the bell or lifting ring.
2. Delivery condition
Supplied valves are tested and set for the required opening pressure or, when ordered for
range, for the upper pressure of the range.
Valves are stamped on the nameplate fixed to the cylindrical part of the body.
USER MANUAL
781T (ex. 781)
776 ( ex. 775-I)
Figure 781
Nameplate
Page 1 of 10
Edition: 07/2016
Date: 01.07.2016
Figure 776
Advertisement
Table of Contents
Related Manuals for Zetkama 781
Summary of Contents for Zetkama 781
- Page 1 ZETKAMA Sp. z o.o. ul. 3 Maja 12 PL 57-410 Ścinawka Średnia USER MANUAL SPRING-LOADED 781T (ex. 781) Edition: 07/2016 SAFETY VALVES 776 ( ex. 775-I) Date: 01.07.2016 zARMAK TABLE OF CONTENTS 1. Principle of operation 2. Delivery condition 3. Installation of safety valves 4.
-
Page 2: Installation Of Safety Valves
Symbols: 1 Type of safety valve 2. Bore diameter 3. Spring number 4. The discharge coefficient for vapours and gases 5. Set pressure or set pressure range 6. Flow area 7. Year of manufacture 8. The minimum lift value 9. Overpressure 10. -
Page 3: Operation Of Safety Valves
Spring Adjusting Screw CuZN40PB2 Locking Screw CuZn40Pb2 Screw plug CuZn40Pb2 Lifting lever for the marine design (WM) spindle is made of the X17CrNi16-2 with nickel coating Drawing 1. Figure 781 Pos. Element Material Number Body EN-GJMW-400-5 Nozzle X39CrMo17-1 Disc X39CrMo17-1... -
Page 4: Adjustment Of The Set Pressure
Set pressure of the valve can be adjusted only within the range of the provided spring. 1. Unscrew the screw plug (pos. 9) and for safety valves figure 781, remove the lifting lever (pos. 10). 2. Loosen the lock screw with the key, according to the enclosed drawings, on a side with shorter stud (pos. 8) so that the holes in the lock screw are in line with the holes in the adjusting screw (pos. -
Page 5: Maintenance And Repair Of Safety Valves
6. Maintenance and repair of safety valves In order to ensure correct operation of safety valves, the following conditions must be meet: valve disc cannot set slantwise to the valve seat sealing surfaces of the seat and disc should ensure tight closure of the valve; ... - Page 6 Use the valve with bellows and a heating Sticky medium jacket, optionally incorporate security plate into the system. The body and the pipes should be kept in Freezing or solidifying medium a state incapable freezing or solidifying of media - apply the heating. If the properties of the medium and the operating conditions do not exclude such possibility - appropriate frequency of...
- Page 7 replace it with new one. If it is possible - apply valve with soft seal on the valve disc, which has a lower sensitivity to grit in the seat. Follow manufacturer’s instructions. Corrosion of elements directly in Replace the valve with the construction contact with the medium, which is the appropriate to the medium according to result of improper valve selection in...
- Page 8 Replace safety valve. Strictly follow manufacturer's instructions and the requirements of the relevant Installation errors provisions in terms of requirements for installation of safety valves – do not induce stress during installation. Replace safety valve. When designing the installation check the manufacturer's instructions and the requirements of the relevant provisions of supervision institutions in the requirements...
- Page 9 Inadequate selection of the safety valve Reselect the valve considering the Pressure in installation still rising – too small capacity of the valve in required capacity and replace it with a despite open safety valve relation to the installation proper one. requirements Replace the spring or the entire safety Valve spring is broken –...
-
Page 10: Warranty
8. Warranty ZETKAMA grants quality warranty with assurance for proper operation of its products, providing that assembly of them is done according to the user’s manual and they are operated according to technical conditions and parameters described in ZETKAMA’s catalogue cards.