Todays deals on Plunger Limit?

Lot of 8x Honeywell 622EN1-6 MS27240-3 Two SPDT Micro Switch Roller Plunger $800.00

Honeywell Microswitch 1EN75-R3 Environmentally Sealed Limit Switch Top Plunger $500.00

Honeywell Micro Switch 23EN51-S Limit Roller/Plunger Arm Sealed SE Military Spec $399.00

Yamatake LDV-5304S Limit Switch Multi Plunger new $329.99

2 NEW SQUARE D TOP PLUNGER LIMIT SWITCHES 90074W36-S4 $299.99

1 NEW MICROSWITCH 1PD1 LIMIT SWITCH PLUNGER Q7-2 $270.00

SIEMENS 3SE3 000-1AA NEW DOUBLE PLUNGER HEAD LIMIT SWITCH 3SE30001AA $250.00

Honeywell Micro Switch 1CH32-RB Limit Electromechanical 4 Pin Plunger NO/NC 4A $253.95

Honeywell Micro Switch Limit Plunger safety 2ls111 new $225.00

Balluff 8-Plunger Limit Switch*New* BNS-519-D08-R12-062 $199.99

Schneider/Telemecanique Limit Swith Roller Plunger Head ZCKD02 NIB ! $169.00

Honeywell LSXC4L LIMIT SWITCH, TOP PLUNGER, DPDT-2NO/2NC NEW IN BOX! $149.95

SQUARE D PUSH ROD PLUNGER LIMIT SWITCH # 9007C62ED $139.00

Allen Bradley 40146-013-65 Limit Switch Top Push Operator Head Plunger New $142.95

20 x Z-15GHW78-B OMRON Limit 250V Normal Open Panel Mount Plunger Switch 675008 $132.16

20 x OMRON Limit Z-15GHW78-B 250V Switch Normal Open Panel Mount Plunger 675008 $132.16

SQUARE D 9007AW38 LIMIT SWITCH TOP PLUNGER SERIES A 9007-AW38 $125.95

KOINO limit switch / top plunger / push plunger KLD x 5pcs SET $122.42

KOINO limit switch / top roller plunger KLD2 x 5pcs SET $116.87

Omron #D4B-7171N Limit Switch Top Roller Plunger $116.26

SQUARE D 9007-AW32 LIMIT SWITCH TOP PLUNGER 15 AMP NIB $112.90

Square D 9007 C54ED Series A Limit Switch 9007C54ED ED Oper Head CT54 Plunger $109.95

20 Z-15GQ22-B OMRON Limit 220V Switch Normally Open Panel Mount Roller Plunger $102.29

20x Z-15GQ22-B Z15GQ22B Limit Open Roller Mount Plunger Basic Micro Switch OMRON $102.29

20 OMRON Z-15GQ22-B Z15GQ22B Limit Open Roller Mount Plunger Basic Micro Switch $102.29

Square D 9007C54EY1901 Limit Switch Series A Plunger Form Y 1901 New $100.00

LIMIT SWITCH STAHL EXPLOSION PROOF BUTTON PLUNGER $99.99

Square D 9007 BO54D Series A Limit Switch 9007BO54D Oper Plunger 120-600V AC 10A $99.95

OMRON ZE-Q22-2S ENCLOSED ROLLER PLUNGER LIMIT SWITCH $80.00

NEW SQUARE D 9007AW46 9007-AW46 PLUNGER LIMIT SWITCH $89.20

NEW N11RL EUCHNER PRECISION SINGLE PLUNGER LIMIT SWITCH $79.00

HONEYWELL MICRO SWITCH ROLLER PLUNGER LIMIT SWITCH MODEL 5LS1 $79.99

KOINO Miniature limit switch, plunger, roller plunger KH-8005-PR x5pcs SET $87.46

Square D Limit Switch 9007-C54E Top Push Plunger 1NO 1NC (5970) $78.00

Honeywell 914CE2-6 (642-1174) Limit Switch w/Top Roller Plunger $85.00

Honeywell MicroSwitch DTV6-2RN2 Limit Switch Roller Plunger NEW! $79.95

KOINO Miniature limit switch, plunger, push plunger limit switches x5pcs SET $83.02

SQUARE D 9007AO36 OPEN POSITION LIMIT SW SER A ROLLER PLUNGER NIB $76.00

NEW BZG1-2RN5243 HONEYWELL MICRO SWITCH PLUNGER NO.-NC. $79.95

Omron ZC-D55-L4 ZCD55L4 Switch Limit Plunger $49.00

SIEMENS, LIMIT SWITCH WITH ROLLER PLUNGER, 3SE3170-1D $70.00

SQUARE D 9007-AW32 LIMIT SWITCH TOP PLUNGER SPDT 15 AMP $75.59

ALLEN BRADLEY 802T-C OILTIGHT LIMIT SWITCH TYPE 13- ENCL. PLUNGER 10 AMPS- NEW $69.99

Honeywell S&C 914CE2-9 Limit Switch, Top Roller Plunger, SPDT $75.00

Telemecanique XCMA103 Roller Plunger Limit Switch 1a1b NIB FS!! $74.60

Honeywell Microswitch DTF2-2RN-RH Plunger Limit Switch! $74.24

BALLUFF BNS519-FD-60-111 SINGLE PLUNGER LIMIT SWITCH ****XLNT**** $64.00

Honeywell Microswitch Limit Switch BAF-1-2RN-LH 20 A Straight Plunger (5988) $65.00

Micro Switch Straight Plunger Actuator BZV6-2RQ New $60.00

NEW 914CE29-6 HONEYWELL MICRO LIMIT SWITCH 125VAC 1NC 1NO SPDT ROLLER PLUNGER $69.95

9007C54E SQUARE D LIMIT SWITCH TOP PLUNGER 10A 1NO-1NC $69.95

SQUARE D 9007-C54E LIMIT SWITCH PUSH ROD PLUNGER NNB $69.90

20 x Z-15GQ-B OMRON Limit Z15GQB 220V Switch Normally Open Panel Mount Plunger $69.14

20 x Z-15GQ-B OMRON Limit220V Normal Open Panel Mount Plunger Switch Z15GQB $69.14

20 x Z-15GQ-B Z15GQB Limit Normal Open Panel Mount Plunger Micro Switch OMRON $69.14

20 x OMRON Z-15GQ-B Z15GQB Limit Normal Open Panel Mount Plunger Micro Switch $69.14

Square D plunger limit switch heavy duty hazardous location GR610 class 9000 $59.73

Micro Switch 151ML1 Heavy Duty Plunger Limit Switch $67.99

OMRON AC PIN PLUNGER LIMIT SWITCH 125 V MODEL D4CC-1001 $59.99

10 x Z-15GHW78-B OMRON Limit 250V Normal Open Panel Mount Plunger Switch 675008 $67.28

10 x OMRON Limit Z-15GHW78-B 250V Switch Normal Open Panel Mount Plunger 675008 $67.28

4 PCS Omron Switch Limit Roller Plunger Z-15GQ22-B $55.00

Honeywell Microswitch LSG1A Side Plunger Limit Switch ! $65.99

OMRON WLD2-TS TOP ROLLER PLUNGER LIMIT SWITCH, SPDT DOUBLE BREAK – NEW $62.00

MICROSWITCH HONEYWELL 914CE1-3G MICRO SWITCH, LIMIT SWITCH, 914CE, TOP PLUNGER - $60.00

Honeywell LSV1A 10 Amps, SPDT – Top Pin Plunger Actuat $60.00

LIMIT SWITCH SIEMENS 3SE31201D ROLLER BUTTON PLUNGER $59.99

SQUARE D 9007-XA7306D SWITCH ROLLER PLUNGER $59.95

9007C62FH SQUARE D LIMIT SWITCH 600V 10AMP HEAVY DUTY SIDE PLUNGER 2 NO / 2 NC $59.95

Micro Switch BAF1-2RQ3-RH Plunger Limit Switch $47.50

NEW CUTLER-HAMMER E47BCC11 COMPACT LIMIT SWITCH CROSS ROLER PLUNGER $58.95

EUCHNER NZ1RS-528 safety plunger limit switch NZ1RS528 $45.00

HONEYWELL 914CE2-Q LIMIT SWITCH, TOP ROLLER PLUNGER ACTUATION, SPDT – NEW/NO BOX $57.00

Omron D4C-4202 Roller Plunger Limit Switch spdt New $56.80

General Electric GE CR9440 D2DF Limit Plunger Switch *NIB w/ instructions* $50.00

Microswitch BAF1-2RQN8-LH Roller Plunger Limit Switch ! $54.99

Micro Switch Honeywell Limit Switch DTE6-2RQ9 10A 250VMAX Roller Plunger $54.95

Telemecanique Limit Switch ZCK E6767 Plunger Head 4490 $48.00

10 Z-15GQ22-B OMRON Limit 220V Switch Normally Open Panel Mount Roller Plunger $52.07

10x Z-15GQ22-B Z15GQ22B Limit Open Roller Mount Plunger Basic Micro Switch OMRON $52.07

10 OMRON Z-15GQ22-B Z15GQ22B Limit Open Roller Mount Plunger Basic Micro Switch $52.07

NEW HONEYWELL SL1-A SWITCH ROLLER PLUNGER 1EA NO/NC SNAP ACTION SL1A $50.95

EUCHNER Micro Switch N01K550C1526 Plunger Limit Switch $38.50

LIMIT SWITCH COMEPI BM2E11Z11 PUSH PLUNGER $49.99

LIMIT SWITCH CROUZET 83.880.112 83880112 PUSH PLUNGER $49.99

LIMIT SWITCH SUNS SN3212-SP SN3212SP ROLLER PLUNGER $49.99

Honeywell Microswitch WZE-2RN Plunger Limit Switch ! $49.99

SQUARE D 9007E LIMIT SWITCH HEAD PLUNGER-TYPE NIB!!! $40.00

Honeywell Microswitch LSD1A Roller Plunger Limit Switch $46.74

Honeywell 9725 Limit Micro Switch P/N 5LS1 10A Top roller plunger Actuator NIB $46.00

Omron D4CC-3032 Sealed Limit Switch Sealed with Roller Plunger $45.00

5 Cutler Hammer Precision Limit Switches,E47BML10,roller plunger,New in package $45.00

LIMIT SWITCH COMEPI AM2T14Z11 SEALED PUSH PLUNGER $44.99

Omron Limit Switch WLD2-Q WLD2Q Top-roller plunger NIB $44.99

Yamatake SL1-A SWITCH ROLLER PLUNGER 1EA NO/NC SNAP ACT $44.99

Honeywell Microswitch Limit Switch Top Roller Plunger SPDT BZE6-2RQ8 (7336) $37.00

Square D 9007AW46 HB Limit Switch Push Plunger SerA New $43.00

OMRON ZE-Q22-2S-ENCLOSED-ROLLER PLUNGER-LIMITED SWITCH $40.00

OMRON D4B-1171N LIMIT SWITCH SNAP TYPE TOP PLUNGER NIB! $35.00

Micro Switch 1PD1 Plunger Adjustable Pulse Switch $42.49

Plunger Limit Questions

innovation in plunger pump industery of world

INTRODUCTION: world industries has a lot of high-pressure plunger reciprocating pumps. According to research done, there are also a considerable number of the pumps above in world Ministry of Oil and other industries. Energy transfer to the fluid of the aforesaid pumps is done periodically while the moving force is supplied by powerful electrical motor. Revolution of electrical motor is transferred to the crankcase after being decreased in the gear box. Then, the rotary Revolution of the crankshaft is changed into reciprocating one in plungers Returning of the plunger through the inside of cylinder makes a vacuum condition and consequently ,the liquid enters the cylinder through a suction check valve and the movement of the plunger makes the suction close completely which discharge opens and the liquid is transferred towards a Discharge vessel .there are two main technical rules in plunger pumps: 1-they must never be started while the discharge valve is close. 2-they must never be shut down while having operated with an operational pressure. Considering that the most permits of repairing activities have been issued for the pumps above (due their high output pressures), and that they have expensive mainly foreign parts, it requires a special attention to starting, stopping, and maintenance of the pumps.

 

DISCUSSION: The pumps above have a standard safe instruction for starting and stopping, in which a manual valve is considered beside the pump by the pump designer and manufacturer. This valve, indeed, acts as a connector between input and output surge tank, which after opening the valve above, the pump pressure will reduce from high pressure to approximately suction pressure, consequently being balanced. According to the manufacturer’s recommends, the manual connecting valve should be open at the time of starting or stopping; and the pump specialists are very sensitive to pressure unbalance at the time of starting and stopping, due to awareness of its destructive consequences and irreparable damages on the pump and electrical motor parts. But in some causes, the plunger pumps above will be out of service in unwanted manner, including Emergency shut down (due to such factors as high temperature oil alarm and low pressure oil alarm,…). When operating the switches above, the pump will be out of service in very high pressure with sudden stoppage. According to the investigations conducted, most of repairs and failures in the pumps which have the most unwanted disabling, including, Broken crankshaft in several stages, Broken plungers or deviation from standard path, crushed moving parts such as bearings, couplings and gears, Continual abnormal sounds, Repetitive leakages from fluid seals and packing, Broken glands and internal rings.

 

METHOD&RESULT: The existing pump technology is related to nearly 3 decades ago. So the considerable changes will be created in amount of productivity and increase in maintenance of the pumps above through designing and installing a PLC system .one xcv valve is installed parallel to the manual valve balancing output and input pressure of the pumps, which will transfer all shut down signals of the pump to the xcv above. After the xcv is opened, instantaneous pressure discharge balancing will be done; and then according to the manufacturer offer, the electrical motor will continue several seconds to move in a descending manner, normal safe manner around the pressure discharge will be done;, normal safe manner around the direction of total stop; and the pump will consequently continue to move with several reciprocating cycles of the plunger (having descending rate) and then will be stopped. The pump starting and stopping will be done by(on/off) buttons of the electrical motor. Therefore, to have more safety and prevent from unintentional mistake by operators of the pump above in the industries, we consider timer delay on in (on button) of the electrical motor so that as soon as the operators presses on button to start pump, xcv will be immediately opened, and pump pressure is dropped, if existed (i.e. the related manual valve is closed), will be occurred, and then electrical motor and pump will be in service. We also consider timer delay off in off button, so that similar operation can be done at the time of pump stopping. After permanently installing the plc system above, trip of the pump under load will be prevented (high pressure), whose consequences include, increased productivity, preventing from the above-mentioned damages to pump and electrical motors, No need for expensive spare parts. Preventing from severe damages of plunger to seals which causes frequent leakages of the pumped liquid(that are economically a lot of expenditure for buying and transporting the liquid).for example crankshaft of plunger pumps for injecting glycol weighs 895 kilogram, power=75 KW, Revolution=1450 RPM , weight of motor=533 KG, 380 volt,144 amp and 3 phase whose rotation speed is 68 revolutions per minute (rpm). At the time of emergency stopping, the whole of a 7000-kilogram equipment will be stopped in an instant, due to lack of the system above in plunger pumps. Above pumps Have 3 reciprocating plungers and move in 3 cylinders separately in each pump .that plungers function are periodic and transfer extremely energy to liquid(DEA glycol).we consider And use analysis of limited element on moment. All of once a one of plungers move forward in to cylinder and that cause transfer pressure Energy to liquid(suction is full close and discharge is full open and pressure is high in cylinder).another plunger return inside cylinder and Intake fluid (suction is full open and discharge is full close).the third plunger is between two operation in above. In emergency shut down (Suddenly stopped) very quickly all thinks stopped. In fact that plunger go forward in cylinder can not do anything and Immediately stopped hard.because resistance high pressure and plunger don’t energy for continue ,it can not move but two plungers don’t have problem for continue move. But that is critical point for crank shaft and what took place is completely unexpected and crank shaft put under torque (angular momentum) All technical expert Understand That torque is very heavy and the tragic consequences of that operation many years in world industries . all pumps have a leakage liquid permanent. cost of liquid (buying and transferring) is high in price. we use a new packing(high technology and self lubricate). don’t need a oil for lubrication. Collect all leakage from every side Glands , Plungers and Air sealing line is simple and directly transfer to nearest sump in unit. Another suggestion: Many pumps have a PCV valve in discharge line for control extra pressure and we can use that PCV .but that need a some mutations. as an example must be replacement PCV suction line to before check valve and add ON/OFF mode to percentage mode.

 

CONCLUSION: I expect to install the PLC systems above or do mutations on pcv (control extra pressure) and use new technology packing (sealtek brand) on all pumps available in the oil, gas, petrochemical and other industries world, which can be examined and considered in the technology of high-pressure plunger pumps in the all factories manufacturing pump.

ACKNOWLEDGEMENT: Special grateful to the all persons to teach ,training me and my technical colleagues that they prove by experience full of science.

 

Warmly thank, Any questions?

About the Author

ahmad ali  alinejad tayyebi born in gashgai tribal  of iran and work in mechanical engineering department

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