Zetkama 781 User Manual Download Page 10

Page 10 of 10 

Condensate in the expansion 
chamber of the safety valve 

Improper drainage installation - 
discharging fluid from the safety valve, 
improper drainage installation, clogged 
drainage system 

Eliminate the incorrectness in the 
discharge and drainage installations. In 
the lowest point of discharge installation it 
is required to apply drainage guarantying 
effective discharge of  residual 
condensate. If the manufacturer of the 
safety valve offers the version with 
drainage of the expansion chamber of 
valve body – it should also be considered 
to use such a valve.   

Noise emissions above the limit 
value  
(in case of discharge of steams 
and gasses) 

Significant flow rates at medium 
discharge from the safety valve. 

In the case of minor exceedances of limit 
values - consider the possibility of 
reducing the flow speed through the use 
of larger safety valve. It should be 
checked, however, that "oversizing" of the 
valve did not cause the instability of its 
work (see "vibrations"). 
In most cases it is necessary to apply 
silencer directly behind the valve and 
screening of the valve (noise barriers). 
While designing the outlet pipes fitted 
with silencers, static and dynamic 
interaction of flow stream flowing through 
the silencer should be taken into account. 
Silencer body should not interfere with 
effective operation of safety valve and 
additional pressure drops should be taken 
under consideration while calculating the 
discharge, and drainage pipes of the valve.  
In each case it should be considered not to 
exceed the value of backpressure allowed 
by the manufacturer of the safety valve 

 

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. Warranty period is 18 months starting from assembly date, however not 
longer than 24 months from the sales date. 

Other warranty terms are to be agreed between the manufacturer of the valve and the purchaser. The manufacturer 
reserves the right to introduce technical changes as the result of improving construction and manufacturing 
technology. 
Failure to comply by the user with the regulations and indications included in this user’s manual shall 
exempt the manufacturer from any liability and warranty. 

 
Address for correspondence: 
 
ZETKAMA Sp. z o.o. 
ul. 3 Maja 12      
57-410 Ścinawka Średnia 
 
Phone   +48 74 86 52 111 
Fax  

+48 74 86 52 101 

Website: www.zetkama.com 

Summary of Contents for 781

Page 1: ...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...

Page 2: ...rgedwithone pipelinefrom a few safetyvalves freeareaofthe flow of this pipeline shouldbe at least equal to the total area of outlet ports flow of these valves Moreover the pipes should be made advanta...

Page 3: ...oosening of the spring force thereby allowing the minimum lift of the disc and the flow of medium Release of the lever should be made at a pressure between 75 and 85 of set pressure Keep in mind that...

Page 4: ...djustment of the set pressure Set pressure adjustment can be carried by a person authorized or UDT inspector performing the revise who in the case of valves ordered for the pressure range adjusts the...

Page 5: ...installation of the valve Remove inlet protective cap Protective cap of the inlet flange has not been removed prior to installation of the valve Remove the valve from the system and clean inlet of th...

Page 6: ...have fallen out and thus the impurities entered into the valve During transport and storage follow manufacturer s instructions If the inner part of the valve has been polluted it need to be cleaned b...

Page 7: ...t the working conditions for valves at upper limit for medium and temperature pressure Consult the manufacturer replace the spring according to the guidelines and recommendations of the manufacturer I...

Page 8: ...to consideration special conditions If such adjustment is not possible replace the valve with a new one with a proper characteristics The valve was designed with too large capacity in relation to the...

Page 9: ...xternal medium leakage Use of safety valve without external tightness test confirmed by the manufacturer Use valve with gastight construction that is with external tightness test of the valve Use of v...

Page 10: ...dynamic interaction of flow stream flowing through the silencer should be taken into account Silencer body should not interfere with effective operation of safety valve and additional pressure drops s...

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