{"product_id":"valvula-check-bola-anticorrosiva-pfa-visor-ansi-150","title":"WCB PFA Anticorrosive Ball Check Valve | With Sight Glass | ANSI 150","description":"\u003ch2\u003eWCB Anti-Corrosive PFA Lined Ball Check Valve — With Integrated Sight Glass, ANSI 150 Flange\u003c\/h2\u003e\n\n\u003cp\u003e\n  The \u003cstrong\u003eanti-corrosive ball check valve with integrated sight glass\u003c\/strong\u003e is the only anti-corrosive check component that allows you to \u003cstrong\u003eobserve the fluid flowing through the valve in real-time without disassembling it or interrupting the process\u003c\/strong\u003e. The sight glass window on the top of the body directly exposes the interior of the valve to visual inspection — the operator can verify in seconds if the fluid is flowing, if there are entrained gas bubbles in the liquid, if there are sediments or suspended particles, or if the ball is sealing correctly when the flow stops. In corrosive fluid lines where disassembling the valve for inspection means working with aggressive acids, the inspection window is an operational safety advantage that no other anti-corrosive check valve offers.\n\u003c\/p\u003e\n\u003cp\u003e\n  The check mechanism is identical to that of the PFA ball check without a sight glass: a PTFE ball floats freely within the PFA-lined body, opening with upward flow and closing by gravity when flow stops or in case of back pressure — no spring, no hinge, no mechanism that could corrode with the aggressive fluid. The window adds inspection capability without modifying the operating principle or the chemical resistance of the PFA lining.\n\u003c\/p\u003e\n\n\u003ch3\u003eThe sight glass — what it allows you to see and why it matters\u003c\/h3\u003e\n\u003cp\u003e\n  The integrated sight glass window in the valve body provides direct visibility of the interior during normal process operation:\n\u003c\/p\u003e\n\u003cul\u003e\n\n  \u003cli\u003e\n\n    \u003cstrong\u003eActive flow verification:\u003c\/strong\u003e In acid dosing lines where the absence of flow may not be immediately detected by the control system, the operator can visually verify in seconds if the fluid is passing through the line — without the need for additional flow instrumentation.\n  \u003c\/li\u003e\n\n  \u003cli\u003e\n\n    \u003cstrong\u003eGas bubble detection:\u003c\/strong\u003e The presence of entrained gas in a liquid fluid is visible through the sight glass — gas bubbles in an acid dosing line can indicate cavitation in the pump, steam leakage in the system, or an unexpected chemical reaction in the line.\n  \u003c\/li\u003e\n\n  \u003cli\u003e\n\n    \u003cstrong\u003eSediment and particle detection:\u003c\/strong\u003e Suspended solids in the fluid are visible through the sight glass before they reach sensitive downstream equipment — allowing for preventive intervention before solids damage pumps, control valves, or instrumentation.\n  \u003c\/li\u003e\n\n  \u003cli\u003e\n\n    \u003cstrong\u003eBall status verification:\u003c\/strong\u003e In the no-flow position, the PTFE ball should be visible in the closed position on the conical seat. If the ball does not close correctly, visual inspection through the sight glass reveals it without disassembly.\n  \u003c\/li\u003e\n\n  \u003cli\u003e\n\n    \u003cstrong\u003eSafety in operations with aggressive acids:\u003c\/strong\u003e Inspecting the interior of a check valve in an HF or concentrated H₂SO₄ line typically involves closing the valve, purging the line, disassembling the valve, and working with aggressive acid residues. The sight glass eliminates the need for disassembly for most routine inspections.\n  \u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch3\u003eOperating principle — springless PTFE ball, vertical installation\u003c\/h3\u003e\n\u003cp\u003e\n  The check mechanism is the same as the standard PFA ball check:\n\u003c\/p\u003e\n\u003cul\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eUpward flow — valve open:\u003c\/strong\u003e Fluid pressure lifts the PTFE ball off its seat. The fluid passes around the ball upwards. The ball is visible through the sight glass in the raised position.\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eFlow stopped or back pressure — valve closed:\u003c\/strong\u003e The ball falls by its own weight onto the PFA-lined conical seat, sealing the passage. The ball is visible through the sight glass in the closed position — immediate visual confirmation of the valve status.\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eSpringless:\u003c\/strong\u003e No active metallic components in contact with the fluid — the spring is the most susceptible component to corrosion in conventional check valves. The PTFE ball and PFA lining are the only materials in contact with the fluid.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\n  \u003cstrong\u003eMandatory vertical installation with upward flow\u003c\/strong\u003e — same as the PFA ball check without a sight glass. Gravity closure requires the ball to fall onto the seat when the flow stops. In horizontal installations, the PFA wafer swing check is the correct alternative.\n\u003c\/p\u003e\n\n\u003ch3\u003eValve components\u003c\/h3\u003e\n\u003ctable\u003e\n\n  \u003cthead\u003e\n\n    \u003ctr\u003e\n\n      \u003cth\u003eNo.\u003c\/th\u003e\n\n      \u003cth\u003eComponent\u003c\/th\u003e\n\n      \u003cth\u003eMaterial\u003c\/th\u003e\n\n      \u003cth\u003eFluid contact\u003c\/th\u003e\n\n    \u003c\/tr\u003e\n\n  \u003c\/thead\u003e\n\n  \u003ctbody\u003e\n\n    \u003ctr\u003e\n\n      \u003ctd\u003e1\u003c\/td\u003e\n\n      \u003ctd\u003eBody, disc, cover\u003c\/td\u003e\n\n      \u003ctd\u003eA216 WCB + PFA lining\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Yes — PFA lined\u003c\/td\u003e\n\n    \u003c\/tr\u003e\n\n    \u003ctr\u003e\n\n      \u003ctd\u003e2\u003c\/td\u003e\n\n      \u003ctd\u003eBall\u003c\/td\u003e\n\n      \u003ctd\u003eVirgin PTFE\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Yes — only moving component in contact with fluid\u003c\/td\u003e\n\n    \u003c\/tr\u003e\n\n    \u003ctr\u003e\n\n      \u003ctd\u003e3\u003c\/td\u003e\n\n      \u003ctd\u003eLining material\u003c\/td\u003e\n\n      \u003ctd\u003ePFA\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Continuous chemical barrier\u003c\/td\u003e\n\n    \u003c\/tr\u003e\n\n    \u003ctr\u003e\n\n      \u003ctd\u003e4\u003c\/td\u003e\n\n      \u003ctd\u003eBolt\u003c\/td\u003e\n\n      \u003ctd\u003eA193 B7\u003c\/td\u003e\n\n      \u003ctd\u003eNo\u003c\/td\u003e\n\n    \u003c\/tr\u003e\n\n  \u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003cul\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eType:\u003c\/strong\u003e Ball check valve with integrated sight glass — gravity retention without spring\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eDesign standard:\u003c\/strong\u003e API 6D\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eFace to face:\u003c\/strong\u003e ASME B16.10\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eFlanges:\u003c\/strong\u003e ANSI\/ASME B16.5 Class 150\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eInspection and testing:\u003c\/strong\u003e API 598\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eBody material:\u003c\/strong\u003e A216 WCB + PFA lining\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eBall:\u003c\/strong\u003e Virgin PTFE\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eInternal lining:\u003c\/strong\u003e PFA\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eSight glass:\u003c\/strong\u003e Integrated sight-glass in the body — visual inspection without disassembly\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eBolts:\u003c\/strong\u003e A193 B7\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eNominal diameters in stock:\u003c\/strong\u003e 1\" (DN25), 1½\" (DN40), 2\" (DN50), 3\" (DN80), 4\" (DN100)\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eDiameters available on request:\u003c\/strong\u003e ½\", ¾\", 1¼\", 5\", 6\"\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eMaximum pressure:\u003c\/strong\u003e 285–290 psi (19.6–20 bar) at 38 °C\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eOperating temperature:\u003c\/strong\u003e -20 °C to +200 °C — verify specific fluid concentration and temperature\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Mandatory vertical with upward flow\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eClosure:\u003c\/strong\u003e By gravity — no spring\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eVacuum capacity:\u003c\/strong\u003e Up to 0.1 mbar\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch3\u003eComparison — three Cematic PFA anti-corrosive check valves\u003c\/h3\u003e\n\u003ctable\u003e\n\n  \u003cthead\u003e\n\n    \u003ctr\u003e\n\n      \u003cth\u003eCriterion\u003c\/th\u003e\n\n      \u003cth\u003ePFA Ball Check with Sight Glass ← This\u003c\/th\u003e\n\n      \u003cth\u003ePFA Ball Check without Sight Glass\u003c\/th\u003e\n\n      \u003cth\u003ePFA Wafer Swing Check\u003c\/th\u003e\n\n    \u003c\/tr\u003e\n\n  \u003c\/thead\u003e\n\n  \u003ctbody\u003e\n\n    \u003ctr\u003e\n\n      \u003ctd\u003eIntegrated inspection sight glass\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Yes — sight-glass\u003c\/td\u003e\n\n      \u003ctd\u003e❌ No\u003c\/td\u003e\n\n      \u003ctd\u003e❌ No\u003c\/td\u003e\n\n    \u003c\/tr\u003e\n\n    \u003ctr\u003e\n\n      \u003ctd\u003eUpward vertical installation\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Yes — mandatory\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Yes — mandatory\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Yes\u003c\/td\u003e\n\n    \u003c\/tr\u003e\n\n    \u003ctr\u003e\n\n      \u003ctd\u003eHorizontal installation\u003c\/td\u003e\n\n      \u003ctd\u003e❌ No\u003c\/td\u003e\n\n      \u003ctd\u003e❌ No\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Yes\u003c\/td\u003e\n\n    \u003c\/tr\u003e\n\n    \u003ctr\u003e\n\n      \u003ctd\u003eConnection\u003c\/td\u003e\n\n      \u003ctd\u003eFlanged ANSI 150\u003c\/td\u003e\n\n      \u003ctd\u003eFlanged ANSI 150\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Wafer — more compact\u003c\/td\u003e\n\n    \u003c\/tr\u003e\n\n    \u003ctr\u003e\n\n      \u003ctd\u003eStatus verification without disassembly\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Immediate — visually\u003c\/td\u003e\n\n      \u003ctd\u003eNot possible without disassembly\u003c\/td\u003e\n\n      \u003ctd\u003eNot possible without disassembly\u003c\/td\u003e\n\n    \u003c\/tr\u003e\n\n    \u003ctr\u003e\n\n      \u003ctd\u003eBubble and sediment detection\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Visual in real time\u003c\/td\u003e\n\n      \u003ctd\u003e❌ Only by instrumentation\u003c\/td\u003e\n\n      \u003ctd\u003e❌ Only by instrumentation\u003c\/td\u003e\n\n    \u003c\/tr\u003e\n\n    \u003ctr\u003e\n\n      \u003ctd\u003eSelf-cleaning by ball rotation\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Yes\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Yes\u003c\/td\u003e\n\n      \u003ctd\u003eNot applicable (disc)\u003c\/td\u003e\n\n    \u003c\/tr\u003e\n\n    \u003ctr\u003e\n\n      \u003ctd\u003eRelative cost\u003c\/td\u003e\n\n      \u003ctd\u003eHigher — integrated sight glass\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Lower\u003c\/td\u003e\n\n      \u003ctd\u003e✅ Lower\u003c\/td\u003e\n\n    \u003c\/tr\u003e\n\n    \u003ctr\u003e\n\n      \u003ctd\u003eBest for\u003c\/td\u003e\n\n      \u003ctd\u003eLines where visual inspection is critical for safety or process\u003c\/td\u003e\n\n      \u003ctd\u003eStandard retention in vertical lines\u003c\/td\u003e\n\n      \u003ctd\u003eRetention in horizontal lines\u003c\/td\u003e\n\n    \u003c\/tr\u003e\n\n  \u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\u003ch3\u003eChemical compatibility\u003c\/h3\u003e\n\u003cul\u003e\n\n  \u003cli\u003e✅ Hydrochloric acid HCl — any concentration\u003c\/li\u003e\n\n  \u003cli\u003e✅ Nitric acid HNO₃ — including concentrated\u003c\/li\u003e\n\n  \u003cli\u003e✅ Hydrofluoric acid HF — any concentration\u003c\/li\u003e\n\n  \u003cli\u003e✅ Liquid Chlorine Cl₂\u003c\/li\u003e\n\n  \u003cli\u003e✅ Sulfuric acid H₂SO₄ — including concentrated\u003c\/li\u003e\n\n  \u003cli\u003e✅ Sodium hypochlorite NaClO\u003c\/li\u003e\n\n  \u003cli\u003e✅ Concentrated alkalis (NaOH, KOH)\u003c\/li\u003e\n\n  \u003cli\u003e✅ Aggressive organic solvents\u003c\/li\u003e\n\n  \u003cli\u003e⚠️ Always verify specific process concentration and temperature\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch3\u003eMain applications\u003c\/h3\u003e\n\u003cul\u003e\n\n  \u003cli\u003e\n\n    \u003cstrong\u003eAcid dosing lines with flow verification:\u003c\/strong\u003e The most frequent application of the sight glass in aggressive chemical installations. In HF, H₂SO₄ or HCl dosing systems where the absence of flow may go unnoticed by the control system, the operator visually verifies during each inspection round that the acid is flowing correctly — without additional instrumentation and without risk of acid exposure due to disassembly.\n  \u003c\/li\u003e\n\n  \u003cli\u003e\n\n    \u003cstrong\u003eReflux prevention with closure verification:\u003c\/strong\u003e In any vertical aggressive acid line where retention is required — discharge of dosing pumps, transfer lines, reactant return — the sight glass allows verifying that the ball is in the closed position when the pump stops, confirming that there is no acid return to upstream equipment.\n  \u003c\/li\u003e\n\n  \u003cli\u003e\n\n    \u003cstrong\u003eProcesses with fluids that generate sediments:\u003c\/strong\u003e In lines where the acid fluid may entrain crystallized solids, precipitates or process particles, the sight glass allows detecting the presence of solids before they reach sensitive downstream equipment — allowing for preventive action without needing to stop the line for inspection.\n  \u003c\/li\u003e\n\n  \u003cli\u003e\n\n    \u003cstrong\u003eDetection of entrained gas in liquid acid lines:\u003c\/strong\u003e The presence of bubbles in a liquid acid line can indicate cavitation in the pump, a chemical reaction generating gas in the line, or air ingress into the system — conditions that the sight glass visually reveals before they affect dosing or cause an incident.\n  \u003c\/li\u003e\n\n  \u003cli\u003e\n\n    \u003cstrong\u003eChemical and petrochemical industry:\u003c\/strong\u003e Retention with visual inspection in mineral acid transport, dosing, and recirculation lines. The sight glass is especially valued in plants with regulations for periodic inspection of process line integrity.\n  \u003c\/li\u003e\n\n  \u003cli\u003e\n\n    \u003cstrong\u003eMining — leaching and SX-EW circuits:\u003c\/strong\u003e Retention with visual verification in concentrated H₂SO₄ and electrowinning electrolyte lines. Visual verification of flow without disassembly significantly reduces personnel exposure time to aggressive fluids during routine inspections.\n  \u003c\/li\u003e\n\n  \u003cli\u003e\n\n    \u003cstrong\u003ePharmaceutical and high-purity processes:\u003c\/strong\u003e Visual verification of the absence of bubbles and particles in synthesis fluids — the sight glass allows confirming the visual quality of the fluid without the need for manual sampling that would involve opening the line.\n  \u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e\n  For the full range of anti-corrosive valves, see \u003ca href=\"\/collections\/valvulas-de-bola-anticorrosivas-interiores-de-pfa\"\u003ePFA anti-corrosive valves category →\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0555\/3917\/1508\/files\/valvula-check-bola-anticorrosiva-wcb-pfa-con-ventana-pcvfl.pdf?v=1765312180\" title=\"Ficha Técnica de Válvula Check Anticorrosiva con Ventana de Vidrio ANSI 1580 Cematic\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003e\u003cspan style=\"color: #b62020;\"\u003eTechnical Data Sheet\u003c\/span\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Cematic","offers":[{"title":"1\"","offer_id":51427119628601,"sku":"PCVFL06","price":1009.0,"currency_code":"USD","in_stock":false},{"title":"1 1\/2\"","offer_id":51427119661369,"sku":"PCVFL08","price":1402.0,"currency_code":"USD","in_stock":false},{"title":"2\"","offer_id":51427119694137,"sku":"PCVFL10","price":1682.0,"currency_code":"USD","in_stock":false},{"title":"2 1\/2\"","offer_id":51427119726905,"sku":"PCVFL12","price":2466.0,"currency_code":"USD","in_stock":false},{"title":"3\"","offer_id":51427119759673,"sku":"PCVFL14","price":3223.0,"currency_code":"USD","in_stock":false},{"title":"4\"","offer_id":51427119792441,"sku":"PCVFL18","price":4652.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/3917\/1508\/files\/V_lvula_check_anticorrosiva_PFA_con_ventana_de_vidrio_y_bridas_ANSI_150.jpg?v=1774282918","url":"https:\/\/cematic.com\/products\/valvula-check-bola-anticorrosiva-pfa-visor-ansi-150","provider":"Cematic","version":"1.0","type":"link"}