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  • Users: YuriB
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  1. YuriB

    ABS hydro module's valves state while driving

    All manuals I found describe how hydro module of ABS works, when braking - how input and output valves are opening and closing depending on the braking processes - but no one describe their state during driving. I guess the input valve is of NO type and de-energized while driving. Is the...
  2. YuriB

    paralleling 2 current start relays

    Who think it is possible to effectively parallel current relays ? For instance, if a 1/2 HP one is not available, one can use in necessity two 1/4 HP relays (however, it is better to add by that an ordinary NO relay to bypass the current to the starting winding). Somebody done this ?
  3. YuriB

    car code reader dedicated to car a/c ?

    Is there a diagnostic car fault reader/ clearer dedicated especially to car climate control ? Or some that is most suitable for that purpose ? (In case one does not need no other functions)
  4. YuriB

    a barometric manometer with 1 pa resolution ?

    Why there are gas pressure differential manometers with 1 Pa resolution, but the barometric absolute pressure ones with only 10 Pa (0.1 mBa)resolution ?
  5. YuriB

    varying head

    In a closed water circulation system with 2-way valves at the consumers and the constant head control, when the valves close, the system resistance and head increases, the system curve comes up and the control through an invertor lowers pump's rpm. Pump curve goes down and the head is kept at a...
  6. YuriB

    mastercool crimper dies

    Does someone know why Mastercool 71500-8SRB Die set #8(13/32in Reduced Barrier), when sold as a part of the hose crimper set, becomes Mastercool 71500-8SRB Die set #8(1/2in Reduced Barrier), when sold separately ? (Note the hose size it is inteded for).
  7. YuriB

    gas for soldering aluminum

    Why nitrogen cannot be used insted of argon as shielding gas in aluminum soldering ?
  8. YuriB

    maximal head

    Can someone please assure me that the no flow point on a head flow diagram for a centrifugal pump correspond indeed to the maximal head ? The reason I ask is because I want to replace HUPA 25-7.0 U 180 with HGPA 25-7.0 U 180. For the both the no flow (maximal head on the diagramm) is 7 m, only...
  9. YuriB

    oversized evaporator's txv capacity

    In a high temperature chilling flower walk-in room, for instance, to avoid dehumidification, there are recommended to be used an ovesized evaporator. Thus, there are majorly sensible heat being removed. From what I understand, the SH should be as high as more than 12K, delta Tair-in minus T...
  10. YuriB

    typical p. drop per meter/foot ?

    For what typical pressure drop per unit of lenght in water pipes are desingned air heating/ cooling systems ?
  11. YuriB

    AS_DC31 navigator.exe in Schneider's Twido Suite

    Maybe somebody encoutered this problem too. I have downloaded and registered the Schneider's Twido Suite. But as soon as I open it there is poping up the message that the "navigator" "encountered a problem" and needs to close the program. I cleaned the registries (or so I think), reinstalled the...
  12. YuriB

    water flow (control) in 3-way valve application

    Water circulates in a closed system either: pump - supply pipe - diverting valve - heat exchanger - return pipe - pump or: pump - supply pipe - diverting valve - return pipe - pump. Is not flow greater, while the pump total head unconditionally less in the second case, independently on the...
  13. YuriB

    thread bigger than the pipe it is made on !?

    For instance NPS 1 inch (DN 25) having outside diameter 33.4 mm will have BSPP thread OD 33.25mm; NPS 2 inch (DN 50) having outside diameter 60.33 mm will have BSPP thread OD 59.61mm; and so on. But how come that NPS 2 1/2 inch (DN 65) having outside diameter 73.03 mm could (allegedly) have...
  14. YuriB

    head loss caused by wrong inlet /outlet connection of heat exchanger ?

    What mey be typical head loss of an AHU heating coil being fed at bottom in comparison to one fed at the top ? The medium being water.
  15. YuriB

    interchangeability of pitot probes ?

    Is it possible to use pitot tubes of others manufacturers on a diffmanometer (flowmeter)? For instance - Dwyer pitots with Testo manometers ?
  16. YuriB

    negative pressure in a circulation system

    Is it normal to have continuosly negative pressure in a water chiller system - actually, along the whole suction line of the pump on the roof?
  17. YuriB

    about the pump best operation point

    How in a water system: chiller - the (constant speed) centrifugal pump - fancoils (with 3 way valves) the BOP of the pump can in practice be achieved - at no demand all 3 way valves get closed (system resistance minimal) the system curve moves to the right, far away from the BOP on the pump...

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