Sabroe smc100 lp hp

[RANGER1]

Could anyone please advise actual difference with Sabroe suction & discharge valve on
LP & HP valves.

Is it simply the number of valve springs, or is there more to it?

Thanks

[Grizzly]

Hi Ranger.
I have to admit I am not totally sure as to what you are asking?
I think you may be asking about when installed in either the LP or HP side of a compound machine,
is that it?

If so then the attached may help?
Grizzly

Attachment 8636

[cricri]

Hi Ranger,
the difference is the number of springs on discharge valve. this was introduced with the MK3 serie. you need 6 spring/cyl on LP side and 8 on HP side. then you can get some problems with MK1 and 2 discharge valves because some holes are missing...the retaining plate is also differentNEW PARTS SMC 100.pdfressort-SMC 100 MK3.pdf

[Grizzly]

Hi Ranger,
the difference is the number of springs on discharge valve. this was introduced with the MK3 serie. you need 6 spring/cyl on LP side and 8 on HP side. then you can get some problems with MK1 and 2 discharge valves because some holes are missing...the retaining plate is also differentNEW PARTS SMC 100.pdfressort-SMC 100 MK3.pdf

Thanks cricri.
I am also wondering now as there are different part No's for the valve plates?
Grizzly

[josef]

Can i prevent evenly lifting plate?

[mbc]

hi Ranger
also there is different between valve plate on NH3 and HCFC.

[cricri]

the ring plate are the same , but the retaining plate are different according if it's ammonia or hfc. I don't understand your question Josef.

[RANGER1]

We are looking at converting a NH3 booster machine to high side, so Sabroe recommend
changing discharge valve assy as well as internal relief valve.
It looks like discharge valves have one more spring 7 compared to 8.

Sound hardly worth worrying about to me, but who am I to say.
Internal relief is 14 bar, so marginal sizing for high side duty.

[HVACRsaurus]

If the internal relief is 14 bar, it's probably only affected by the difference between discharge & sump pressure. Assuming high side suction of 200kpa, 1400kpa internal relief takes you up to 1600kpa delivery - probably ok for most applications.

[mbc]

I do not saying you do as same as I did ,
about 4 years ago we repaired one smc 16-100 s and we were in harry and we were short off discharge valve in our stock so I used HCFC valve plate to run system and later we go to change it. I checked it 3 times and it is same as NH3 and still is working. our system is running -15 + 35.

[cricri]

Ranger, your SMC100 is MK 1,2,3 or 4?

[RANGER1]

Ranger, your SMC100 is MK 1,2,3 or 4?

cricri MK3 compressor

[RANGER1]

If the internal relief is 14 bar, it's probably only affected by the difference between discharge & sump pressure. Assuming high side suction of 200kpa, 1400kpa internal relief takes you up to 1600kpa delivery - probably ok for most applications.

Totally agree, but new ones are balanced port I believe.
Knowing that, I think we have to update it in the interest of everyone.

[RANGER1]

I do not saying you do as same as I did ,
about 4 years ago we repaired one smc 16-100 s and we were in harry and we were short off discharge valve in our stock so I used HCFC valve plate to run system and later we go to change it. I checked it 3 times and it is same as NH3 and still is working. our system is running -15 + 35.

Would the HCFC plates have more valve lift, more springs, or both?

With Mycom you could use ***** machine on ammonia, but not the other way.
Now they just make ***** type machine, as its easier to keep stock of on machine than two.

[Grizzly]

comments removed as being an idiot!

SOS
Grizzly

[Josip]

Hi, RANGER1,

We are looking at converting a NH3 booster machine to high side, so Sabroe recommend
changing discharge valve assy as well as internal relief valve.
It looks like discharge valves have one more spring 7 compared to 8.

Sound hardly worth worrying about to me, but who am I to say.
Internal relief is 14 bar, so marginal sizing for high side duty.

Do you have a TSMC-two stage (108/116) type and like to convert it complete to high stage or you have a normal SMC-single stage (104/108/112/116) working on low stage and now you need it to work on high stage?

What about literature you have?


Best regards, Josip

[RANGER1]

Josip, Its a SMC108L running as a booster at the moment.

[cricri]

Hi Ranger, I explained in a private message to one of us:
what I can say is:
- it's always the same spring
- the number of springs depend of the discharge pressure and the refrigerant, see my attached file on RE "ressorts...
- the retaining plate change with the refrigerant and the number of holes needed for the springs
ammonia, 1 grove on the suction and discharge retaining plates
HCFC HFC, 2 groves .......
this difference allow to the ring plate more "stroke" and more way for the refrigerant HFC HCFC
(then it's possible to use HFC retaining plate with ammonia but not the reverse.)
the discharge retaining plate is also marked (Mk3&4) LP;HP;VHP on the upside
this difference is particular to Sabroe, most of the other brand make no difference between ***** and ammonia
about the safety valve Mk3 compressors are fitted with safety valves independant from the suction pressure. the 14 is designed for the low stage of a TSMC code 3137-046 you need 3137-007 22bars

[RANGER1]

Thanks everyone for your input

[Josip]

Hi, RANGER1

Josip, Its a SMC108L running as a booster at the moment.

Then is enough to install appropriate number of springs on valves and change by-pass valve.

Standard for one and two stage (HP) compressors is with preset opening pressure of 24 bar (348psi).

Special for one and two stage (HP) compressors is with preset opening pressure of 22 bar (319 psi) delivered only in special cases according to local rules and regulations.

Standard for two stage (LP) compressors 12 bar (174psi).

Opening pressure is independent of the pressure on the suction side of the compressor.



Best regards, Josip