jammer valve

08:12 Nov 28, 2018
English to Polish translations [PRO]
Tech/Engineering - Agriculture / combine harvesters
English term or phrase: jammer valve
Jak po polsku nazywa się "jammer valve"?

https://talk.newagtalk.com/forums/thread-view.asp?tid=117130...

Funkcja wydaje się jasna, ale dotąd nie spotkałem się z niczym podobnym.
Macieks
Poland
Local time: 02:44


Summary of answers provided
3zawór elektromagnetyczny przekazujący ciśnienie sygnałowe do wylotu pompy//zawór sygnałowy
Frank Szmulowicz, Ph. D.


Discussion entries: 1





  

Answers


9 hrs   confidence: Answerer confidence 3/5Answerer confidence 3/5
zawór elektromagnetyczny przekazujący ciśnienie sygnałowe do wylotu pompy//zawór sygnałowy


Explanation:
Jammer Solenoids and the Implications of Connecting the Pump
Outlet to a Signal Network

In Chapter 16, jammer solenoids were described in open-center hydraulic
systems. Jammer solenoids are also used in LSPC variable-displacement systems.
Even though the solenoids provide the same effect—placing the system
on demand (maximum system pressure)—the jammer solenoid has an opposite
design when used in LSPC variable-displacement pump systems.
In an LSPC variable-displacement hydraulic system, anytime the pump
outlet pressure is directly connected to the signal pressure, the pump will suddenly
enter the stall mode. Why is this? The fl ow compensator has pump outlet
oil pressure acting on the top of the spool while pump outlet oil pressure and
the fl ow control spring pressure are acting on the bottom of the spool. Therefore,
the fl ow control spool remains shifted upward, asking for more oil. As
the pump attempts to upstroke, however, the PC spool senses the high system
pressure and holds the pump destroked in the stall mode.
A jammer solenoid in an LSPC variable-displacement pump is normally
closed, which is the opposite of the design in an open-center system. See
Figure 18-23. When the jammer solenoid valve is energized, it opens to connect pump outlet pressure to signal pressure. John Deere uses an LSPC jammer solenoid on their sprayers. Case IH uses LSPC jammer solenoids on their combines.
AGCO uses LSPC jammer solenoids on their Massey Ferguson, Gleaner,
Challenger, and Fendt combines.
Case IH used the 12-volt diode assembly that was discussed in Chapter 16
on their 2100 and 2300 series combines. However, like most manufacturers,
late-model machines have the jammer solenoid directly controlled by the ECM,
allowing the manufacturer to eliminate an external diode module. The jammer
solenoid is sometimes called a signal valve solenoid because it creates a false
signal by connecting pump outlet pressure to signal pressure.

Reasons to Use a Jammer Solenoid in an LSPC System
Manufacturers typically use jammer solenoids in LSPC systems for two
reasons. The fi rst reason is to force the hydraulic system to perform the same as
a PC hydraulic system described in Chapter 17. Any time the jammer solenoid

A John Deere 4630 sprayer uses a jammer solenoid that pressurizes the
hydraulic system to a constant 3000 to 3100 psi (207 to 214 bar). In this application,
the jammer solenoid is constantly energized. The sprayer takes advantage
of the instantaneous response of the hydraulic system. One benefi t of
this system over a true PC system is that the jammer solenoid can be disabled
during engine startup.
Jammer solenoids have the same effect whether a hydraulic system is open
center or an LSPC variable-displacement system. Any time the jammer solenoid
is energized, the hydraulic system exhibits the characteristics of a PC
system: high system pressure, high noise, and responsive hydraulic controls.
The second reason for using a jammer solenoid is to eliminate the need of
a signal network with numerous shuttle valves (refer back to Figures 18-6).
A simple closed-center DCV can easily be incorporated into a variabledisplacement
LSPC system with the use of a jammer solenoid. This system
design eliminates the use of a complex system of primary and secondary
shuttle valves. When manufacturers use jammer solenoids, they sometimes
use orifi ces in conjunction with the DCVs to control the cylinder speed.
John Deere 4940 and 4730 sprayers use a jammer solenoid, but not for all of
the system functions. The 4730 sprayer uses the jammer for everything except
adjusting the tread and raising and lowering the boom. The 4940 sprayer uses
the jammer solenoid for everything except adjusting the tread and tilt.


Signal solenoid valve
(jammer valve)

Figure 18-23. A jammer solenoid valve used in an LSPC variable-displacement system is designed to connect p

Frank Szmulowicz, Ph. D.
United States
Local time: 21:44
Native speaker of: Native in EnglishEnglish, Native in PolishPolish
PRO pts in category: 110
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