[{"data":1,"prerenderedAt":763},["ShallowReactive",2],{"catalog:meta":3,"guides:page:\u002Finjection-molding-machine-parts\u002Fhydraulics\u002Fpressure-gauge:*":258,"guides:topics:hydraulics:\u002Finjection-molding-machine-parts\u002Fhydraulics\u002Fpressure-gauge:path,title,short":555,"guides:page:\u002Finjection-molding-machine-parts\u002Fhydraulics:diagram":644,"diagram:id:pressure-gauge":646,"catalog:parts::HY-MO-01":754},{"categories":4,"machines":132,"zones":212,"totals":255},[5,35,59,122],{"id":6,"name":7,"slug":8,"description":9,"partCount":10,"subcategories":11},"EC","Electrical Components","electrical","Electrical systems and components for injection molding machines including heaters, thermocouples, servo motors, and controllers.",11,[12,17,22,27,31],{"id":13,"name":14,"slug":15,"partCount":16},"EC-CBC","Circuit Boards & Controllers","circuit-boards",4,{"id":18,"name":19,"slug":20,"partCount":21},"EC-CE","Connectors & Cables","connectors-cables",2,{"id":23,"name":24,"slug":25,"partCount":26},"EC-GEP","Servo Motors & Drives","servo-motors",1,{"id":28,"name":29,"slug":30,"partCount":21},"EC-HT","Heaters","heaters",{"id":32,"name":33,"slug":34,"partCount":21},"EC-SF","Safety Components","safety",{"id":36,"name":37,"slug":38,"description":39,"partCount":40,"subcategories":41},"HY","Hydraulic Components","hydraulic","Complete range of hydraulic system components including pumps, valves, motors, and pressure controls for injection molding machines.",14,[42,46,51,55],{"id":43,"name":44,"slug":45,"partCount":26},"HY-AU","Accumulators","accumulators",{"id":47,"name":48,"slug":49,"partCount":50},"HY-CV","Control Valves","control-valves",6,{"id":52,"name":53,"slug":54,"partCount":26},"HY-MO","Monitors & Gauges","monitors-gauges",{"id":56,"name":57,"slug":58,"partCount":50},"HY-PW","Pumps & Motors","pumps-motors",{"id":60,"name":61,"slug":62,"description":63,"partCount":64,"subcategories":65},"MC","Mechanical Components","mechanical","Mechanical parts and assemblies including barrels, screws, tie bars, bushings, platens, and clamping components.",42,[66,71,75,80,85,89,93,97,101,105,109,114,118],{"id":67,"name":68,"slug":69,"partCount":70},"MC-BC","Barrels & Cylinders","barrels-cylinders",5,{"id":72,"name":73,"slug":74,"partCount":16},"MC-SB","Screw Barrels & Seals","screws",{"id":76,"name":77,"slug":78,"partCount":79},"MC-TC","Tie Bars & Columns","tie-bars",7,{"id":81,"name":82,"slug":83,"partCount":84},"MC-GZ","Bushings & Guides","bushings-guides",8,{"id":86,"name":87,"slug":88,"partCount":26},"MC-PP","Platens","platens",{"id":90,"name":91,"slug":92,"partCount":70},"MC-TL","Toggle & Links","toggle-links",{"id":94,"name":95,"slug":96,"partCount":21},"MC-CC","Clamping Components","clamping",{"id":98,"name":99,"slug":100,"partCount":21},"MC-GMP","Tools & Accessories","tools-accessories",{"id":102,"name":103,"slug":104,"partCount":21},"MC-ES","End Caps & Plates","end-caps",{"id":106,"name":107,"slug":108,"partCount":26},"MC-SR","Seals & Rings","seals-rings",{"id":110,"name":111,"slug":112,"partCount":113},"MC-JM","Joints & Mounts","joints-mounts",3,{"id":115,"name":116,"slug":117,"partCount":26},"MC-SG","Safety Guards","safety-guards",{"id":119,"name":120,"slug":121,"partCount":26},"MC-CR","Clamping Mechanism","clamping-mechanism",{"id":123,"name":124,"slug":125,"description":126,"partCount":113,"subcategories":127},"O","Other Components","other","Additional components including filters, cooling systems, lubrication parts, and other auxiliary equipment.",[128],{"id":129,"name":130,"slug":131,"partCount":113},"O-TC","Filters & Cooling","filters-cooling",[133,143,161,172,180,188,194,200,205],{"id":134,"name":135,"slug":134,"series":136,"partCount":142},"haitian","Haitian International",[137,138,139,140,141],"Mars Series (MA)","Jupiter Series (JU)","Zhafir Venus Series (VE)","Zhafir Zeres Series (ZE)","Zhafir Jeres Series (JE)",68,{"id":144,"name":145,"slug":144,"series":146,"partCount":160},"yizumi","Yizumi",[147,148,149,150,151,152,153,154,155,156,157,158,159],"A6 Series","A5-EU Series","A5-N Series","SKIII Series","DP Series","D1 Series","FF Series","FF-M Series","P Series","CG-P Series","VM Series","SPET Series","LSR Series",12,{"id":162,"name":163,"slug":162,"series":164,"partCount":171},"chen-hsong","Chen Hsong",[165,166,167,168,169,170],"JETMASTER MK Series","JETMASTER SVP Series","SUPERMASTER Series","EASYMASTER Series","SPARK Series","JETMASTER C2 Series",10,{"id":173,"name":174,"slug":173,"series":175,"partCount":179},"tederic","Tederic",[176,177,178],"NEO Series","D Series (Two-Platen)","DE Series (All-Electric)",0,{"id":181,"name":182,"slug":181,"series":183,"partCount":179},"borch","Borch",[184,185,186,187],"BU Series (Two-Platen)","BS-III Series (Servo)","BE Series (All-Electric)","BM Series (Multi-color)",{"id":189,"name":190,"slug":189,"series":191,"partCount":179},"log-machine","LOG Machine",[192,193],"LOG-SE Series","LOG-EE Series (All-Electric)",{"id":195,"name":196,"slug":195,"series":197,"partCount":179},"donghua","Donghua",[198,199],"DH Series (Servo)","DH-TP Series (Two-Platen)",{"id":201,"name":202,"slug":201,"series":203,"partCount":179},"sunbun","Sunbun",[204],"Sunbun Servo Series",{"id":206,"name":207,"slug":206,"series":208,"partCount":179},"lijin","L.K. Machinery (Lijin)",[209,210,211],"POTENZA Series","FORZA Series (Two-Platen)","ELETTRICA Series (All-Electric)",[213,217,221,225,228,231,235,238,242,248,251],{"id":214,"number":26,"name":215,"role":216,"partCount":21},"clamp-cylinder","Clamping cylinder","The hydraulic cylinder behind the rear platen. It drives the crosshead that straightens the toggle links, which opens and closes the mold and builds the clamping force.",{"id":218,"number":21,"name":219,"role":220,"partCount":50},"toggle","Toggle mechanism","Links, pins and bushings between the rear and moving platens. They multiply the force of the clamping cylinder and lock the mold shut while plastic is injected.",{"id":222,"number":113,"name":223,"role":224,"partCount":113},"ejector","Ejector","A small cylinder behind the moving platen that pushes the ejector rods and plate forward to release the finished part from the mold.",{"id":78,"number":16,"name":226,"role":227,"partCount":40},"Tie bars & bushings","Four steel columns that join the platens, guide the moving platen and carry the clamping force. Tie bar nuts lock them in place; bushings guide the moving platen along them.",{"id":88,"number":70,"name":229,"role":230,"partCount":21},"Platens & mold plates","The fixed and moving platens carry the two halves of the mold; the rear platen anchors the toggle. Locating rings and clamping plates center and hold the mold.",{"id":232,"number":50,"name":233,"role":234,"partCount":50},"barrel-screw","Barrel, screw & nozzle","The screw turns inside the heated barrel to melt and mix the plastic, then moves forward to inject it through the nozzle into the mold. The screw tip and check ring stop melt from flowing back.",{"id":30,"number":79,"name":236,"role":237,"partCount":113},"Heater bands & sensors","Heater bands around the barrel and nozzle melt the plastic. Thermocouples measure each heating zone so the controller can hold the set temperature.",{"id":239,"number":84,"name":240,"role":241,"partCount":79},"injection-unit","Injection unit","Injection cylinders push the screw forward, the hydraulic (plasticizing) motor turns it, and the carriage moves the unit against the mold on its guide rails.",{"id":243,"number":244,"name":245,"role":246,"partCount":247},"hydraulics",9,"Hydraulic unit","The pump, motor, valves, accumulator, filters and oil cooler in the machine base. They supply and control the oil pressure for every movement of the machine.",16,{"id":8,"number":171,"name":249,"role":250,"partCount":244},"Electrical cabinet","The controller, I\u002FO and drive boards, servo drives, contactors and safety switches that run and protect the machine.",{"id":252,"number":10,"name":253,"role":254,"partCount":21},"feet","Machine feet","Leveling bolts and anti-vibration pads under the machine base that keep the machine level and stop vibration spreading to the floor.",{"parts":256,"subcategories":257},70,23,{"id":259,"title":260,"body":261,"description":526,"diagram":527,"extension":528,"faq":529,"item":542,"lastModified":543,"meta":544,"navigation":545,"order":546,"parts":547,"path":549,"seo":550,"seoTitle":551,"short":552,"stem":553,"__hash__":554},"guides\u002Finjection-molding-machine-parts\u002Fhydraulics\u002Fpressure-gauge.md","Hydraulic pressure gauge of an injection molding machine",{"type":262,"value":263,"toc":517},"minimark",[264,277,282,285,324,328,361,370,381,385,405,409,439,443,468,481,485,505],[265,266,267,268,272,273,276],"p",{},"A hydraulic pressure gauge is the dial instrument that shows the system pressure on an injection molding machine, usually mounted on or near the pump or the valve manifold. It is a mechanical gauge: a ",[269,270,271],"strong",{},"Bourdon tube"," inside the case tries to straighten as the pressure rises, and a small movement turns the needle. Most gauges on hydraulic machines have a ",[269,274,275],{},"glycerin-filled case",", highlighted in the drawing, because the liquid damps the needle against pump pulsation and vibration. The gauge needs no power, so it is the simplest independent check of what the controller display says.",[278,279,281],"h2",{"id":280},"how-a-hydraulic-pressure-gauge-works","How a hydraulic pressure gauge works",[265,283,284],{},"The drawing shows the gauge from the front and with the dial removed. Its numbered parts are:",[286,287,288,295,301,307,312,318],"ol",{},[289,290,291,294],"li",{},[269,292,293],{},"Glycerin-filled case",": the sealed case and window. The glycerin damps the needle, and the plug on top closes the filling hole.",[289,296,297,300],{},[269,298,299],{},"Dial",": the printed scale, usually in MPa or bar (1 MPa = 10 bar).",[289,302,303,306],{},[269,304,305],{},"Needle",": sits on the pinion shaft and points at the pressure.",[289,308,309,311],{},[269,310,271],{},": a curved, flattened tube closed at its tip. Oil pressure tries to straighten it, and the tip moves in proportion to the pressure.",[289,313,314,317],{},[269,315,316],{},"Movement",": a link, a toothed sector and a pinion that turn the small movement of the tube tip into the full sweep of the needle.",[289,319,320,323],{},[269,321,322],{},"Connection",": the threaded socket that screws into the gauge port. Inside the case it anchors the Bourdon tube and carries the oil into it.",[278,325,327],{"id":326},"types-and-mounting","Types and mounting",[329,330,331,337,343,349,355],"ul",{},[289,332,333,336],{},[269,334,335],{},"Direct mount",": the connection is at the bottom of the case and the gauge screws straight into a port on the pump, manifold or a gauge line.",[289,338,339,342],{},[269,340,341],{},"Panel mount",": the connection is at the back and a front flange or bracket holds the gauge in a panel, connected by a gauge hose or tube.",[289,344,345,348],{},[269,346,347],{},"Range",": the full-scale value. Choose one above the highest pressure the gauge will see, so the normal working pressure is well inside the scale.",[289,350,351,354],{},[269,352,353],{},"Accuracy class",": the permitted error as a percentage of full scale. A class 1.6 gauge with a 0 to 25 MPa scale can be out by up to 0.4 MPa anywhere on the scale, so a range much higher than you need also reads less precisely.",[289,356,357,360],{},[269,358,359],{},"Fill liquid",": glycerin is the usual fill; silicone oil is used where the temperature varies more widely.",[265,362,363,364,369],{},"The ",[365,366,368],"a",{"href":367},"\u002Fparts\u002Fhy-mo-01\u002F","hydraulic pressure gauge"," we supply is glycerin-filled, reads 0 to 25 MPa with an accuracy of ±1.6 %, and is available for direct mounting or as a vertical, non-panel 25 MPa Tecsis gauge.",[265,371,372,373,376,377,380],{},"Many machines protect the gauge with a ",[269,374,375],{},"gauge isolating valve",", such as a push-button valve that connects it only while pressed, or a ",[269,378,379],{},"damping restrictor"," in the connection. Both reduce the pressure peaks that reach the Bourdon tube.",[278,382,384],{"id":383},"signs-of-a-faulty-pressure-gauge","Signs of a faulty pressure gauge",[329,386,387,390,393,396,399,402],{},[289,388,389],{},"The needle does not return to zero when the system is fully depressurized.",[289,391,392],{},"The reading differs from a calibrated test gauge, or from the controller in a way it did not before.",[289,394,395],{},"The needle sticks, jumps or shakes hard: the movement is damaged or the glycerin has leaked out.",[289,397,398],{},"Glycerin leaks from the case, or has turned cloudy or dark so the dial is hard to read.",[289,400,401],{},"A cracked window, a bent needle, or a needle that has gone past the end of the scale.",[289,403,404],{},"Oil leaking at the connection.",[278,406,408],{"id":407},"why-gauges-fail","Why gauges fail",[329,410,411,421,427,433],{},[289,412,413,416,417,420],{},[269,414,415],{},"Pressure peaks"," from valves switching and from the accumulator, and ",[269,418,419],{},"overpressure"," above the gauge's range, which can bend the Bourdon tube permanently.",[289,422,423,426],{},[269,424,425],{},"Vibration",", especially on gauges mounted directly on the pump.",[289,428,429,432],{},[269,430,431],{},"Heat"," from the power unit, which ages the case seal and the fill.",[289,434,435,438],{},[269,436,437],{},"Mechanical damage"," during maintenance and mold changes.",[278,440,442],{"id":441},"checking-and-replacing-a-pressure-gauge","Checking and replacing a pressure gauge",[286,444,445,453,456,459,462,465],{},[289,446,447,448,452],{},"Stop the pump and release all hydraulic pressure, including the ",[365,449,451],{"href":450},"\u002Finjection-molding-machine-parts\u002Fhydraulics\u002Faccumulator\u002F","accumulator"," if fitted. Do not rely on the suspect gauge to show that the pressure is gone.",[289,454,455],{},"Unscrew the gauge with a spanner on the flats of the connection, never by turning the case.",[289,457,458],{},"To check a gauge, fit a calibrated test gauge at the same point and compare the readings at several pressures, or send the gauge for calibration.",[289,460,461],{},"Fit the new gauge with the right seal for its thread: a sealing washer for parallel threads, or a suitable thread sealant for tapered threads.",[289,463,464],{},"If the filling plug has a vent, follow the gauge maker's instructions: some gauges must be vented after fitting so pressure inside the case does not affect the reading.",[289,466,467],{},"Pressurize slowly and check for leaks.",[265,469,470,471,475,476,480],{},"The pressure test in our article on ",[365,472,474],{"href":473},"\u002Fblog\u002Ftroubleshooting-hydraulic-pressure-loss\u002F","troubleshooting hydraulic pressure loss"," uses a calibrated gauge to tell a pump or relief valve problem from a fault further down the circuit. For the electronic sensor that the controller reads, see the ",[365,477,479],{"href":478},"\u002Finjection-molding-machine-parts\u002Fhydraulics\u002Fpressure-transducer\u002F","pressure transducer",".",[278,482,484],{"id":483},"what-to-send-for-a-replacement-quote","What to send for a replacement quote",[286,486,487,490,493,496,499,502],{},[289,488,489],{},"The range and units printed on the dial, and the accuracy class.",[289,491,492],{},"The dial size, and whether the connection is at the bottom or the back.",[289,494,495],{},"The connection thread size and type.",[289,497,498],{},"Direct or panel mounting, and the flange dimensions for a panel gauge.",[289,500,501],{},"The fill liquid, and photos of the dial and the connection.",[289,503,504],{},"The machine brand and model.",[265,506,507,511,512,516],{},[365,508,510],{"href":509},"\u002Frequest-quote\u002F","Request a quote",", and see the ",[365,513,515],{"href":514},"\u002Finjection-molding-machine-parts\u002Fhydraulics\u002F","hydraulic system guide"," for where the gauge sits in the circuit.",{"title":518,"searchDepth":21,"depth":21,"links":519},"",[520,521,522,523,524,525],{"id":280,"depth":21,"text":281},{"id":326,"depth":21,"text":327},{"id":383,"depth":21,"text":384},{"id":407,"depth":21,"text":408},{"id":441,"depth":21,"text":442},{"id":483,"depth":21,"text":484},"How the glycerin-filled hydraulic pressure gauge of an injection molding machine works, how to choose and check one, signs of failure and how to quote it.","pressure-gauge","md",[530,533,536,539],{"question":531,"answer":532},"Why is a hydraulic pressure gauge filled with glycerin?","The glycerin damps the movement of the needle and the Bourdon tube, so the needle stays readable instead of shaking with pump pulsation and machine vibration. It also lubricates the movement and reduces wear.",{"question":534,"answer":535},"What range of pressure gauge should I use?","Use a gauge whose full scale is above the highest pressure it will see, so the normal working pressure sits well inside the scale rather than near the end. The original gauge, or the machine manual, shows the range the maker chose.",{"question":537,"answer":538},"Why does my pressure gauge not return to zero?","Either pressure is still trapped in the line, for example by an accumulator or a closed valve, or the gauge has been damaged by overpressure or pressure peaks. Confirm the system is depressurized, then compare the gauge with a calibrated test gauge or replace it.",{"question":540,"answer":541},"Why does the pressure gauge read differently from the controller?","The gauge and the pressure transducer may be in different places in the circuit, the gauge may be damaged, or the transducer may be out of calibration. Check both against a calibrated test gauge fitted at the same point.","case","2026-11-01",{},true,22,[548],"HY-MO-01","\u002Finjection-molding-machine-parts\u002Fhydraulics\u002Fpressure-gauge",{"title":260,"description":526},"Hydraulic Pressure Gauge: How It Works, Faults, Replacement","Pressure gauge","injection-molding-machine-parts\u002Fhydraulics\u002Fpressure-gauge","z-TZ_25MiCPMw-zimd4kUQYZBoDqa34MYCl5wuLq-9E",[556,560,564,568,572,576,580,584,588,592,596,600,604,608,612,616,620,624,628,632,636,640],{"path":557,"title":558,"short":559},"\u002Finjection-molding-machine-parts\u002Fhydraulics\u002Fhydraulic-circuit","Hydraulic circuit of an injection molding machine","Hydraulic circuit",{"path":561,"title":562,"short":563},"\u002Finjection-molding-machine-parts\u002Fhydraulics\u002Fhydraulic-pump","Hydraulic pump of an injection molding machine","Hydraulic pump types",{"path":565,"title":566,"short":567},"\u002Finjection-molding-machine-parts\u002Fhydraulics\u002Fvane-pump","Vane 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case, dial, needle, Bourdon tube, movement and connection, numbered.",[651,655],{"x":652,"y":653,"text":654},180,54,"FRONT",{"x":656,"y":653,"text":657},450,"DIAL REMOVED",[659,674,695,707,718,732],{"id":542,"name":293,"role":660,"parts":661,"marker":662,"shapes":666},"Sealed case filled with glycerin, which damps the needle against pump pulsation and vibration. The plug on top closes the filling hole.",[548],[663,664,665,664],24,110,105,{"solid":667,"line":670,"hidden":672},[668,669],"M84 170a96 96 0 1 0 192 0a96 96 0 1 0 -192 0z","M174 64h12a2 2 0 0 1 2 2v6a2 2 0 0 1 -2 2h-12a2 2 0 0 1 -2 -2v-6a2 2 0 0 1 2 -2z",[671],"M92 170a88 88 0 1 0 176 0a88 88 0 1 0 -176 0z",[673],"M354 170a96 96 0 1 0 192 0a96 96 0 1 0 -192 0z",{"id":675,"name":299,"role":676,"marker":677,"shapes":680},"dial","The printed scale, usually in MPa or bar, read through the window.",[663,678,679,678],200,104,{"solid":681,"line":683},[682],"M98 170a82 82 0 1 0 164 0a82 82 0 1 0 -164 0z",[684,685,686,687,688,689,690,691,692,693,694],"M130.5 219.5L123.4 226.6","M113.4 191.6L103.9 194.7","M110.9 159L101 157.5","M123.4 128.9L115.3 123","M148.2 107.6L143.7 98.7","M180 100L180 90","M211.8 107.6L216.3 98.7","M236.6 128.9L244.7 123","M249.1 159L259 157.5","M246.6 191.6L256.1 194.7","M229.5 219.5L236.6 226.6",{"id":696,"name":305,"role":697,"marker":698,"shapes":702},"needle","Sits on the pinion shaft and turns with the movement to point at the pressure.",[699,663,700,701],230,213,113,{"solid":703,"line":705},[704],"M176 170a4 4 0 1 0 8 0a4 4 0 1 0 -8 0z",[706],"M173 182L213 113",{"id":708,"name":271,"role":709,"marker":710,"shapes":715},"bourdon","Curved, flattened tube closed at the tip. Oil pressure tries to straighten it, and the tip moves in proportion to the pressure.",[711,712,713,714],616,120,514,133,{"solid":716},[717],"M443.6 243.7A74 74 0 1 1 522.9 157.2L513 158.9A64 64 0 1 0 444.4 233.8Z",{"id":719,"name":316,"role":720,"marker":721,"shapes":724},"movement","Link, toothed sector and pinion that turn the small movement of the tube tip into the full sweep of the needle.",[711,722,723,700],214,501,{"solid":725,"line":728},[726,727],"M486 200L447.5 186A41 41 0 0 1 465.5 164.5Z","M444 170a6 6 0 1 0 12 0a6 6 0 1 0 -12 0z",[729,730,731],"M518 158L501.3 212.9","M486 200L501.3 212.9","M483.5 200a2.5 2.5 0 1 0 5 0a2.5 2.5 0 1 0 -5 0z",{"id":733,"name":322,"role":734,"marker":735,"shapes":738},"connection","Threaded socket that screws into the gauge port. Inside the case it also anchors the Bourdon tube and carries the oil into it.",[652,736,652,737],336,312,{"solid":739,"line":747},[740,741,742,743,744,745,746],"M166 266h28v16h-28z","M162 282h36a2 2 0 0 1 2 2v10a2 2 0 0 1 -2 2h-36a2 2 0 0 1 -2 -2v-10a2 2 0 0 1 2 -2z","M168 296h24v16h-24z","M446 228h32a2 2 0 0 1 2 2v32a2 2 0 0 1 -2 2h-32a2 2 0 0 1 -2 -2v-32a2 2 0 0 1 2 -2z","M448 264h28v18h-28z","M444 282h36a2 2 0 0 1 2 2v10a2 2 0 0 1 -2 2h-36a2 2 0 0 1 -2 -2v-10a2 2 0 0 1 2 -2z","M450 296h24v16h-24z",[748,749,750,751,752,753],"M168 300L192 300","M168 304L192 304","M168 308L192 308","M450 300L474 300","M450 304L474 304","M450 308L474 308",[755],{"partNumber":548,"name":756,"subcategory":52,"subcategoryName":757,"shortDescription":758,"inStock":545,"zone":243,"compatibleMachines":759},"Hydraulic Pressure Gauge","Monitoring & Instruments","Glycerin-filled hydraulic pressure gauge for injection molding machine system monitoring.",[760,761,762],"Haitian MA Series","Haitian Jupiter Series","Yizumi A5 Series",1793548983773]