FREQUENTLY ASKED QUESTIONS

Q1. What are the advantages of Multi-spring Actuator?


A1. Multi-spring Actuator is compact in design due to which overall height of linear valves is significantly reduced. They also have Low friction & high response speed. Due to multiple springs inside the actuator, it is likely to perform in case one or more spring fails to operate. Multi-spring Actuator is balanced, due to which the forces are equally distributed inside the actuator. This increases the life of the diaphragm. Another advantage of Multi-spring Actuator is that these are field reversible.



Q2. What kind of body Gasket is used for Control Valves?


A2. We provide Grafoil body gasket with SS shim. The gasket is non-compressible & facilitates proper alignment of Bonnet / Yoke over the body.



Q3. How is long life of Actuator diaphragms ensured?


A3. The Actuator diaphragms (T36 / T60 / T108) are die rolled. Due to unique shape of the diaphragms, they operate in rolling motion instead of simple up and down motion upon Air filling & venting. This minimizes stress on the periphery of die rolled diaphragms compared to flat diaphragms and hence, provide extended life.



Q4. How much spares shall we keep in the inventory?


A4. The stuffing box for valves sizes varying from ½’’ to 3’’ and 4’’ to 6’’ is common. This drastically reduces the cost of ownership as well as inventory. Furthermore, for valve sizes varying from ½’’ to 6’’, class rating 150# / 300#, only three different Actuator sizes (T36 / T60 / T108) that are sufficient to fulfil most thrust requirements in KN.



Q5. What is the MOC of Control valve Actuator Diaphragm?


A5. We provide Nitrile Butyl rubber diaphragm for the Actuators.



Q6. What is the medium for testing the seat leakage?


A6. We use air at 4 bar as the standard test medium for checking the seat leakage. For testing at higher pressure than 4 bar, Nitrogen gas is used. We have customized seat leakage testing rigs according to sizes of the valves.



Q7. What are the In-house testing facilities available at TECNIK?


A7. We have developed an In-house SCADA based Hydro Testing system, Seat Leakage Test rig, Cyclic Test, Calibration Test & Cv Test bench.
We also conduct Magnetic Particle Inspection of castings, Dye Penetration test, Hardness Testing, Paint Thickness Test, Viscosity measurement test for paints, Spark Test for Lined Valves, Radiography Viewer and Shell Thickness measurement for castings.



Q8. What are the advantages of Skirted plug design?


A8. Skirted plug design are top & bottom guided. They generate less vibration resulting in reduced noise and smooth control of the process as compared to parabolic plugs. These plugs are also less subjected to cavitation erosion than parabolic plugs. Since, with V-port plugs, the cavitation jet is diverted away from the plug, the cavitation zone is not attached to the plug surface, so the imploding bubbles cause less damage.



Q9. What are the special Trims available for Cavitation?


A9. We have special Trims with Multi-hole cage NA-1, NA-2, NA-3 & NA-4 & (Multi Stage Plug) for severe Cavitation.



Q10. Which engineering tools does TECNIK use to select valve and design Cv value?


A10. TECNIK uses License copy of sizing software provided by CONVAL by F.I.R.S.T. (Germany). CONVAL® integrates extensive calculation functionalities for components and processes in industrial systems, based on tried-and-tested methods, such as DIN, VDI, VDMA EN/ISO and ISA. TECNIK has trained engineers for appropriate sizing & selection of Control valves for simplest to critical applications.



Q11. Which are the various Certifications acquired by TECNIK?


A11. Quality standards: ISO 9001:2015 (Certificate No: AB09IS204256) Environmental standards: ISO 14001:2015 (Certificate No: AB14IS204255) CE marking: Certificate no 3078/1/2017



Q12. Do valves manufactured by TECNIK, qualify Fugitive Emission Test Standard?


A12. Yes, TECNIK valves have been tested and certified by TUV India for Fugitive Emission Test under Helium gas. The 6’’, class 300# valve has been tested according to ISO-15848 Part 1 2015th Edition, endurance class CC1 (20000 cycles) & Tightness class: CHb.



Q13. Which tests have been performed on Spring & Rubber diaphragms of Single & Multi-spring pneumatic Actuators to ensure optimum performance?


A13. TECNIK has performed Cyclic Test on Linear Actuators Model T36, T60, T108, T150 & T300. A total of 100,000 cycles has been performed on each Actuator and spring range.The test has been witnessed and reviewed as per standard operating procedure by TUV.



Our Clients