Parker Instrumentation Training Flashcards
What are the pressure ratings of Parker’s stainless steel C-Series check valves?
6,000 psi 1/8”-3/4”
5,000 1”
Why use instrumentation grade valves (6 reasons)
size, pressure, end connection, cleaning, cleaning, leak integrity, complimentary products/portfolio
When considering a selector or diverter valve, what inlet must we derate the pressure rating.
side port, not the bottom port
What is the pressure rating for the HB Series Ball Valves?
10,000 with PEEK seats and 6,000 with PCTFE seats
What are the three stem types for Parker’s needle valves?
R is on/off
K is on/off but has a soft tip which is good for gas applications
N is regulation
Can you use a rotary plug valve in throttling applications?
Yes
What application is a CB Series check valve designed for?
reducing maintenance and performance requirements for dual fuel turbines.
What are the major differences between the C-series and CO-series check valve?
C series is general use
CO series is good for R&D and micro electronics, essentially applications requiring high integrity leak protection, it carries the only published leak rate of 4x10-9 CC/SEC (with viton seals, standard cubic centimeters per second)
Are metering valves designed for on/off applications?
No, the stem will be damaged if bottomed out.
Does Parker offer repair kits for their metering valves?
No, the disassembly process is not field friendly, components can be damaged beyond useable condition.
Questions to ask when specing a valve?
temperature, end connection size, end connection type, what media, pressure, service, manual or actuated, area classifications.
Features of B-Series ball valve?
packing allows for easy inline adjustment, free floating ball design allows for seat wear compensation, microfinished ball ensures leak tight shutoff, applications up to 6,000 psi
What is the pressure rating of a B-Series ball valve with PTFE Seats?
1,500 psi
Features of the MB Series Ball valve?
packing nut allows for easy inline maintenance, competes with Swagelok 40 series (millions of installations worldwide), single piece molded PFA packing encapsulates the ball eliminating entrapment areas, applications up to 3,000 psi.
Why would someone use the U-Series Needle Valve?
dust seal in the bonnet, use in applications up to 6,000 psi and temps as high as 1,200F with grafoil packing, packing below the threads, it’s meant for severe service applications, non-rotating stem increases service life.
What is the purpose of packing below the threads (PBT)?
packing below the threads protects thread lubricants from media, helping prevent galling
Why use a CPI Instrumentation fitting?
easier to install, moly thread lubricant, 3-piece design, suparcase ferrule, tremendous value/performance with scratched tubing, dam of material builds to prevent tube blow out during pressure, seal on tube in front great for high vibration and thermal cycling applications
What are the 3 bonnet designs for needle valves?
integral (1-piece), screwed (bonnet screwed in to the body), union (bonnet sit in top of valve body nut torques bonnet into valve, making it very secure).
3 flow patterns of needle valves
globe, straight through, and angle
What type of Parker valves would you use for throttling applications?
needle and plug
Purpose of relief valve?
when upstream pressure exceeds the closing force exerted by the spring the lower stem opens permitting flow through the valve.
Plug valve versus ball valve
Plug is economical, compact, throttling, higher Cv value
Ball offers bi-directional flow, higher operating pressures and cylce life, 3-way options
When was CPI and A-Lok developed and released?
A-Lok: Developed in ‘82 | Released in ‘85
CPI: Developed in 66’ | released in 68’
5 reasons to use Tubing over pipe
simple, fewer fittings, less leak paths, less pressure drop, economy of space and weight
Why did Parker come out with Suparcase hardening?
to help ensure the ferrule was hard enough to seal on the tube for gas applications.
In addition to hardening, how does Suparcase help?
increases corrosion resistance of ASTM type 316 stainless steel, it’s proprietary to Parker Hannifin
Where is the sealing on both CPI and A-Lok?
CPI the sealing is in the front of the assembly
A-Lok is in the back with the rear ferrule
What applications would benefit from using CPI versus Alok?
high vibration, gas sealing, and thermal cycling applications, the unique bowing action of the single ferrule acts as a dampener against the tube seal helping with high vibration stress.
Why does the ferrule need to be harder than the tube?
in order to create a good seal, the ferrule must grip the tubing, so if the ferrule is softer or equal to the tubing , the ferrule will not create a leak tight seal.
What are three reasons why a customer may find CPI useful compared to ALOK?
safety (reduced chance of error in assembly), fewer components to stock (1 ferrule versus 2 ferrules), sealing point moved to front so performs better in thermal cycling, gas sealing, and high vibration applications.
why is it important to understand temperature deration of tubing?
as temperature increases, the integrity of pressure performance diminishes increasing the potential of blowout if spec’d incorrectly.
why is it vitally important to ensure the tubing has bottomed out against the fitting body?
to ensure there’s no leak path.
When reviewing the tubing pressure versus wall thickness guide, what does the white and gray shaded area represent?
white is acceptable for gas service
gray is unacceptable for gas service
once a fitting assembly has been assembled to finger tight, what is the protocols for various sizes to ensure proper assembly?
1/16-3/16 should be tightened 3/4 turn beyond finger tight
1/4” - 1” should be tightened 1-1/4 turn beyond finger tight
when using a gap gauge, what should you know?
if the gauge does NOT fit between the nut and body, the fitting has been properly tightened. If the gauge fits between the nut and body, additional tightening is required.
can you use a gap gauge for remakes?
No
why would you use a port connector?
to close couple two fittings instead of measuring and cutting a small length of tubing
for port connectors, how many turns beyond finger tight for proper assembly?
1/4 turn
Why use a plug fitting?
to plug the unused port on a fitting
For plugs, how many turns beyond finger tight for proper assembly?
1/4 turn
For remakes, how many turns should you go beyond original position?
1/2 a hex flat
what are three main reasons fittings could leak?
under tightening, improper tube insertion, damage to tubing.
