{"product_id":"gate-valve","title":"Gate Valve","description":"\u003cp\u003eGate Valve isolates flow in water distribution networks and industrial pipelines. It has a ductile iron body, a fully encapsulated EPDM wedge and a stainless steel stem. An epoxy coating of at least 250 μm protects the body against corrosion.\u003c\/p\u003e\n\u003cp\u003eGate valve size range covers DN50 to DN800 in PN10, PN16, PN20, PN25 and PN40 pressure classes. Product Overview\u003c\/p\u003e\n\u003cp\u003eGate valve resilient seated is a linear motion bi directional isolation valve designed for full flow on off service in pressurized pipelines. The internal design features a flat bottomed, unobstructed passage that allows laminar flow without turbulence or debris retention. The ductile iron body construction delivers high impact resistance and tensile strength, while the resilient seated rubber wedge ensures bubble tight sealing against the internal fusion bonded epoxy coating.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGate Valve Resilient Seated Sealing:\u003c\/strong\u003e Fully encapsulated EPDM wedge compresses evenly against the epoxy lined ductile iron body to guarantee zero leakage shutoff without requiring a bottom seat pocket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Bore Flow Passage:\u003c\/strong\u003e Straight through hydrodynamic bore matches pipe nominal diameter, preventing sediment accumulation, minimizing head loss, and allowing full pipeline pigging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCold Rolled Stainless Steel Stem:\u003c\/strong\u003e Heavy duty spindle with rolled threads preserves grain integrity, decreases frictional wear on the brass stem nut, and provides long service life under high differential pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple O Ring Spindle Seal:\u003c\/strong\u003e Gate valve aintenance free stem sealing arrangement isolates working fluid from the atmosphere and prevents external groundwater infiltration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion Resistant FBE Coating:\u003c\/strong\u003e Electrostatic fusion bonded epoxy coating with a minimum dry film thickness of 250 μm protects internal and external ductile iron surfaces against corrosion, chemical attack, and biological growth.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Actuation Setup:\u003c\/strong\u003e Equipped with standard top flange mounting compatible with handwheels, extension spindles, bevel gearboxes, electric actuators, and pneumatic actuators.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications of Gate Valve\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification Details\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003eGate Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Size Range\u003c\/td\u003e\n\u003ctd\u003eDN50 to DN800 (1 1\/2 inch to 32 inch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure Ratings\u003c\/td\u003e\n\u003ctd\u003ePN10, PN16, PN20, PN25, PN40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody and Bonnet Material\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron EN GJS 400 15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWedge Material\u003c\/td\u003e\n\u003ctd\u003eDuctile iron core fully encapsulated with vulcanized EPDM rubber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStem Spindle Material\u003c\/td\u003e\n\u003ctd\u003eStainless steel with cold rolled threads (AISI 420 \/ AISI 316)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStem Nut Material\u003c\/td\u003e\n\u003ctd\u003eForged brass MS58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating System\u003c\/td\u003e\n\u003ctd\u003eFusion bonded epoxy powder coating (minimum 250 μm DFT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnd Connections\u003c\/td\u003e\n\u003ctd\u003eFlanged ends drilled to EN 1092 2 and ASME B16.42 \/ B16.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFace to Face Dimensions\u003c\/td\u003e\n\u003ctd\u003eEN 558\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTightness Class\u003c\/td\u003e\n\u003ctd\u003eEN 12266 1 Rate A \/ ISO 5208 Rate A (Zero bubble leakage)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorking Temperature\u003c\/td\u003e\n\u003ctd\u003e10°C to +80°C up to +120°C with high temperature elastomer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive Modes\u003c\/td\u003e\n\u003ctd\u003eHandwheel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eCompliance and International Standards\u003c\/h2\u003e\n\u003cp\u003eThis gate valve is designed and manufactured according to international standards:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign and Valve Standards:\u003c\/strong\u003e EN 1171, EN 1074 1, EN 1074 2, DIN 3352, AWWA C509, AWWA C515, BS 5163\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Specifications:\u003c\/strong\u003e EN 1563 (EN GJS 400 15 ductile iron), ASTM A536, ASTM A276\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlange Dimensions and Drilling:\u003c\/strong\u003e EN 1092 2, ISO 7005 2, ASME B16.42, ASME B16.5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFace to Face Standard:\u003c\/strong\u003e EN 558 Series 14, EN 558 Series 15, ISO 5752, ASME B16.10\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTesting and Inspection:\u003c\/strong\u003e EN 12266 1, ISO 5208, API 598\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePotable Water Approvals:\u003c\/strong\u003e WRAS, DVGW W270, ACS, NSF\/ANSI 61, NSF\/ANSI 372\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eDimension and Weight Table\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eNominal Size (DN)\u003c\/th\u003e\n\u003cth\u003eFlange OD [mm]\u003c\/th\u003e\n\u003cth\u003ePitch Circle PCD [mm]\u003c\/th\u003e\n\u003cth\u003eBolt Holes (Qty × Size)\u003c\/th\u003e\n\u003cth\u003eFace to Face [mm]\u003c\/th\u003e\n\u003cth\u003eTotal Height [mm]\u003c\/th\u003e\n\u003cth\u003eHandwheel Dia [mm]\u003c\/th\u003e\n\u003cth\u003eWeight [kg]\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDN50\u003c\/td\u003e\n\u003ctd\u003e165\u003c\/td\u003e\n\u003ctd\u003e125\u003c\/td\u003e\n\u003ctd\u003e4 × M16\u003c\/td\u003e\n\u003ctd\u003e150\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003ctd\u003e180\u003c\/td\u003e\n\u003ctd\u003e11.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDN65\u003c\/td\u003e\n\u003ctd\u003e185\u003c\/td\u003e\n\u003ctd\u003e145\u003c\/td\u003e\n\u003ctd\u003e4 × M16\u003c\/td\u003e\n\u003ctd\u003e170\u003c\/td\u003e\n\u003ctd\u003e280\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e14.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDN80\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e160\u003c\/td\u003e\n\u003ctd\u003e8 × M16\u003c\/td\u003e\n\u003ctd\u003e180\u003c\/td\u003e\n\u003ctd\u003e315\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e18.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDN100\u003c\/td\u003e\n\u003ctd\u003e220\u003c\/td\u003e\n\u003ctd\u003e180\u003c\/td\u003e\n\u003ctd\u003e8 × M16\u003c\/td\u003e\n\u003ctd\u003e190\u003c\/td\u003e\n\u003ctd\u003e350\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003ctd\u003e24.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDN125\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003ctd\u003e210\u003c\/td\u003e\n\u003ctd\u003e8 × M16\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e410\u003c\/td\u003e\n\u003ctd\u003e280\u003c\/td\u003e\n\u003ctd\u003e33.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDN150\u003c\/td\u003e\n\u003ctd\u003e285\u003c\/td\u003e\n\u003ctd\u003e240\u003c\/td\u003e\n\u003ctd\u003e8 × M20\u003c\/td\u003e\n\u003ctd\u003e210\u003c\/td\u003e\n\u003ctd\u003e465\u003c\/td\u003e\n\u003ctd\u003e315\u003c\/td\u003e\n\u003ctd\u003e44.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDN200\u003c\/td\u003e\n\u003ctd\u003e340\u003c\/td\u003e\n\u003ctd\u003e295\u003c\/td\u003e\n\u003ctd\u003e12 × M20\u003c\/td\u003e\n\u003ctd\u003e230\u003c\/td\u003e\n\u003ctd\u003e580\u003c\/td\u003e\n\u003ctd\u003e350\u003c\/td\u003e\n\u003ctd\u003e72.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDN250\u003c\/td\u003e\n\u003ctd\u003e405\u003c\/td\u003e\n\u003ctd\u003e355\u003c\/td\u003e\n\u003ctd\u003e12 × M24\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003ctd\u003e700\u003c\/td\u003e\n\u003ctd\u003e400\u003c\/td\u003e\n\u003ctd\u003e115.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDN300\u003c\/td\u003e\n\u003ctd\u003e460\u003c\/td\u003e\n\u003ctd\u003e410\u003c\/td\u003e\n\u003ctd\u003e12 × M24\u003c\/td\u003e\n\u003ctd\u003e270\u003c\/td\u003e\n\u003ctd\u003e810\u003c\/td\u003e\n\u003ctd\u003e500\u003c\/td\u003e\n\u003ctd\u003e165.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDN400\u003c\/td\u003e\n\u003ctd\u003e580\u003c\/td\u003e\n\u003ctd\u003e525\u003c\/td\u003e\n\u003ctd\u003e16 × M27\u003c\/td\u003e\n\u003ctd\u003e310\u003c\/td\u003e\n\u003ctd\u003e1080\u003c\/td\u003e\n\u003ctd\u003eGearbox\u003c\/td\u003e\n\u003ctd\u003e310.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDN500\u003c\/td\u003e\n\u003ctd\u003e715\u003c\/td\u003e\n\u003ctd\u003e650\u003c\/td\u003e\n\u003ctd\u003e20 × M30\u003c\/td\u003e\n\u003ctd\u003e350\u003c\/td\u003e\n\u003ctd\u003e1340\u003c\/td\u003e\n\u003ctd\u003eGearbox\u003c\/td\u003e\n\u003ctd\u003e530.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDN600\u003c\/td\u003e\n\u003ctd\u003e840\u003c\/td\u003e\n\u003ctd\u003e770\u003c\/td\u003e\n\u003ctd\u003e20 × M33\u003c\/td\u003e\n\u003ctd\u003e390\u003c\/td\u003e\n\u003ctd\u003e1590\u003c\/td\u003e\n\u003ctd\u003eGearbox\u003c\/td\u003e\n\u003ctd\u003e820.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDN800\u003c\/td\u003e\n\u003ctd\u003e1025\u003c\/td\u003e\n\u003ctd\u003e950\u003c\/td\u003e\n\u003ctd\u003e24 × M36\u003c\/td\u003e\n\u003ctd\u003e470\u003c\/td\u003e\n\u003ctd\u003e2100\u003c\/td\u003e\n\u003ctd\u003eGearbox\u003c\/td\u003e\n\u003ctd\u003e1450.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eApplications and Industry Use Cases\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrinking Water Distribution:\u003c\/strong\u003e Municipal trunk transmission lines, pumping stations, and urban water treatment facilities such as HDPE piping network, PVC pressure piping network, steel pipe networks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWastewater and Sewage Systems:\u003c\/strong\u003e Raw sewage lines, stormwater runoffs, wastewater pump stations, and effluent discharge pipes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial Cooling and Utility Loops:\u003c\/strong\u003e Isolation duties in power generation, steel mills, paper plants, and chemical process cooling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirefighting Networks:\u003c\/strong\u003e Underground ring mains, fire hydrant feeding lines, and pump house manifolds meeting safety fire protection codes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAgricultural Irrigation:\u003c\/strong\u003e High capacity pump manifolds, filtration stations, and primary distribution channels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePumping Stations:\u003c\/strong\u003e Isolation of pumps and connected pipework during maintenance or equipment replacement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eOperational Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eReliable Zero Leakage Shutoff: The resilient seated EPDM wedge conforms precisely to the smooth epoxy coated ductile iron body, providing sealing performance with zero allowable leakage under bidirectional pressure.\u003c\/li\u003e\n\u003cli\u003eLow Fluid Resistance and Energy Savings: Because the bore is straight and full diameter, the gate valve produces minimal head loss, which cuts long term pumping station electricity costs.\u003c\/li\u003e\n\u003cli\u003eHigh Mechanical Durability: EN GJS 400 15 ductile iron provides high tensile strength and impact toughness, absorbing water hammer pressure shocks that fracture standard cast iron.\u003c\/li\u003e\n\u003cli\u003eDirect Underground Burial: The thick electrostatic epoxy coating (minimum 250 μm) combined with a sealed spindle eliminates the need for concrete valve chambers, reducing installation and excavation expenses.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eIntegration and Use with Infrastructure Piping Systems\u003c\/h2\u003e\n\u003cp\u003eA resilient seated ductile iron Gate Valve is engineered for seamless integration across all primary underground utility piping materials, including High-Density Polyethylene (HDPE), Ductile Iron (DI), Carbon Steel, and PVC networks. Serving as the primary isolation unit in buried infrastructure, it guarantees bidirectional leak-tight shutoff while matching the hydraulic capacity and operating pressure of modern pipe systems.\u003c\/p\u003e\n\u003ch3\u003eCompatibility with Pipe Materials and Jointing Methods\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHDPE (PE100, PE100-RC) Piping:\u003c\/strong\u003e Direct connection is accomplished via stub flanges (backing rings) or electrofusion transition couplers. Gate valves absorb pipeline expansion forces and pressure fluctuations without transferring bending moments to plastic pipe joints.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuctile Iron (DI) Spigot and Socket Lines:\u003c\/strong\u003e Flanged gate valves integrate directly using standard flanged spigot adapters (universal flange adaptors) or bolted mechanical joints, providing structural continuity in heavy-duty distribution mains.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWelded Carbon Steel Pipes:\u003c\/strong\u003e Attached via standard EN 1092-2 or ASME welding-neck counter-flanges, accommodating high-pressure industrial, raw water, and utility loops up to PN40.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePVC-U Pressure Pipes:\u003c\/strong\u003e Joined using restrained mechanical coupling flanges, eliminating pipe movement and axial slippage during valve cycling.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eEngineering Corner\u003c\/h2\u003e\n\u003ch3\u003eFlow Rate and Pressure Drop Equations\u003c\/h3\u003e\n\u003cp\u003eThe volumetric flow rate through a fully open gate valve is calculated using the following formula:\u003c\/p\u003e\n\u003cp\u003eQ = Kv * sqrt(Delta P \/ SG)\u003c\/p\u003e\n\u003cp\u003eWhere:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eQ = Volumetric flow rate (m3\/h)\u003c\/li\u003e\n\u003cli\u003eKv = Valve flow coefficient in m3\/h at a 1 bar pressure drop\u003c\/li\u003e\n\u003cli\u003eDelta P = Differential pressure drop across the valve (bar)\u003c\/li\u003e\n\u003cli\u003eSG = Specific gravity of fluid (water = 1.0)\u003c\/li\u003e\n\u003cli\u003esqrt = Square root function\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eTo convert the flow factor from metric (Kv) to Imperial (Cv):\u003c\/p\u003e\n\u003cp\u003eCv = 1.156 * Kv\u003c\/p\u003e\n\u003cp\u003eBecause the resilient seated gate valve has an unobstructed cylindrical full bore, its localized resistance coefficient (zeta) is low, typically ranging between:\u003c\/p\u003e\n\u003cp\u003ezeta = 0.15 to 0.25\u003c\/p\u003e\n\u003cp\u003eThe hydraulic head loss (hL) in meters of fluid column is expressed as:\u003c\/p\u003e\n\u003cp\u003ehL = zeta * (v^2 \/ (2 * g))\u003c\/p\u003e\n\u003cp\u003eWhere:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ehL = Head loss in meters of fluid column (m)\u003c\/li\u003e\n\u003cli\u003ezeta = Minor resistance loss coefficient (dimensionless)\u003c\/li\u003e\n\u003cli\u003ev = Fluid flow velocity (m\/s)\u003c\/li\u003e\n\u003cli\u003eg = Acceleration due to gravity (9.81 m\/s2)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMaterial Mechanical Properties and Pressure Tests\u003c\/h3\u003e\n\u003cp\u003eDuctile Iron Body (EN GJS 400 15):\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMinimum Tensile Strength (Rm) = 400 MPa\u003c\/li\u003e\n\u003cli\u003eMinimum Yield Strength (Rp0.2) = 250 MPa\u003c\/li\u003e\n\u003cli\u003eMinimum Elongation at Fracture (A5) = 15 percent\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFactory Hydrostatic Quality Testing:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHydrostatic Shell Strength Test Pressure = 1.5 * PN (for example: 24 bar for PN16; 60 bar for PN40)\u003c\/li\u003e\n\u003cli\u003eHydrostatic Seat Tightness Test Pressure = 1.1 * PN (for example: 17.6 bar for PN16; 44 bar for PN40)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is a gate valve?\u003c\/h3\u003e\n\u003cp\u003eA gate valve is a bi directional linear isolation valve that uses a movable wedge gate to start or stop fluid flow. In a resilient seated gate valve, the wedge is fully coated with vulcanized rubber, which compresses against a coated ductile iron body to create a tight seal without trapping solids in the valve bottom.\u003c\/p\u003e\n\u003ch3\u003eWhere is a gate valve used?\u003c\/h3\u003e\n\u003cp\u003eA gate valve is primarily used in municipal water distribution, sewage and wastewater treatment, agricultural irrigation, fire protection systems, and industrial utility pipelines where full fluid flow or positive isolation is required with low pressure drop.\u003c\/p\u003e\n\u003ch3\u003eCan a gate valve be used for flow throttling or regulation?\u003c\/h3\u003e\n\u003cp\u003eNo. A gate valve must always be operated fully open or fully closed. Operating a gate valve partially open exposes the resilient EPDM wedge and stem nut to high velocity fluid vibrations, cavitation, and premature seat degradation.\u003c\/p\u003e\n\u003ch3\u003eWhat is the maximum recommended flow velocity for a gate valve?\u003c\/h3\u003e\n\u003cp\u003eFor municipal potable water and raw water lines complying with EN 1074 2 standards, maximum continuous fluid velocity is 3.0 m\/s. For temporary emergency bypass flow conditions, velocities up to 4.0 m\/s are permissible.\u003c\/p\u003e\n\u003ch3\u003eHow is a gate valve connected to an HDPE pipeline?\u003c\/h3\u003e\n\u003cp\u003eA gate valve is connected to an HDPE (PE100 or PE100 RC) line using a dedicated HDPE stub end (flange adaptor) welded to the pipe via butt fusion or electrofusion, combined with a metal backing ring (ductile iron or coated steel) drilled to EN 1092 2 or ASME flange standards. The assembly is then bolted directly to the flanged gate valve body with standard flat gaskets or profile steel insert gaskets.\u003c\/p\u003e\n\u003cp\u003eTo connect a flanged gate valve to an HDPE pipe, follow these simple steps:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlide on the backing ring:\u003c\/strong\u003e Slip a loose metal backing flange onto the HDPE pipe.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeld the stub end:\u003c\/strong\u003e Butt fuse an HDPE flange adapter (stub end) to the end of the pipe.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlace the gasket:\u003c\/strong\u003e Put an EPDM rubber gasket between the HDPE stub face and the gate valve flange.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBolt together:\u003c\/strong\u003e Pull the metal backing ring forward, insert bolts with flat washers, and tighten evenly in a cross pattern with a torque wrench.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eHow do I 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