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Polygomma is one of the best manufacturer of EPDM Pond Liner, Geomembranes & Heavy Duty Pond Liner. We also supply a wide variety of durable pond liners for building ponds and many more other items. Our pond Liner is the perfect choice for your water garden. We provide the natural look with this flexible, easily adaptable rubber pond liner.

Single-disc swing check valve (TH-CKV-SDS) Area of application Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems Data sheet of Single-disc swing check valve TYPE: Wafer, single disc SIZE & CONNECTIONS: DN50 to D600 MEDIUM: Air, Inert Gas, Oil, Seawater, Waste water, Water MATERIALS: Cast Iron / Ductile Iron/ Carbon Steel / Stainless Steel / Alu Bronze PRESSURE RATING: PN10, PN16 TEMPERATURE: -30°C to 200°C SEAT/LINING: Replaceable Liner / Bonded Liner NBR/EPDM/VITON CERTIFICATES & APPROVALS: DNV-GL, Lloyds, DNV, ABS, BV Type Approval 3.1 & 3.2 Cert (on request) Standards Design and Manufacture Conform to API 6D Dimensions Conform to ANSI B16.5 Face to Face dimensions Conform to API 6D Testing Conform to API598 Material of Single-disc Swing check valve Parts PART NAME Material BODY ASTM A182 F304 A216 WCB DISC / PLATE ASTM A182 F304 A216 WCB A536 65-45-12 SHAFT / STEM SS431/SS420/SS410/SS304 SEAT / LINING NBR/EPDM/VITON BOLTS Carbon steel NUTS Stainless steel SPRING SS304/SS306 Sing-disc swing check valve features The structure length is short, its structure length is only 1/4~1/8 of the traditional flange check valve Small size, light weight, its weight is only 1/4~1/20 of the traditional flange check valve The valve disc closes quickly and the water hammer pressure is small Both horizontal and vertical pipes can be used, easy to install Smooth flow channel, fluid resistance is small Sensitive action and good sealing performance Short disctravel, low valve closing impact The overall structureis simple and compact, beautiful appearance Long service lifetime and high reliability Related types of check valves: We have other types of check valves: dual plate check valve, tilting disc swing check valve, lift swing check valve, silent check valve, ball check valve used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D,

A gate valve is a gate plate of an opening and closing part. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve is sealed by the contact of the valve seat and the gate plate. Usually, the sealing surface will be welded with metal materials to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc. The gate has a rigid gate and an elastic gate. According to the different gate plates, the gate valve is divided into a rigid gate valve and an elastic gate valve. Area of application Marine industry, Water supply & drainage, fire fighting, shipbuilding, water treatment, power stations, energy, food, chemical, and other systems Data sheet of gate valve: TYPE: Wafer, double flange SIZE & CONNECTIONS: Resilient seated: DN50 to D600 Metal seated: DN50 to DN1200 MEDIUM: Waste water, Water, Seawater, Air, Inert Gas, Oil. MATERIALS: Cast Iron / Ductile Iron/ Carbon Steel / Stainless Steel / Alu Bronze PRESSURE RATING: PN10, PN16, PN25 TEMPERATURE: -30°C to 200°C SEAT/LINING: Replaceable Liner / Bonded Liner NBR/EPDM/VITON; SS/BRONZE CERTIFICATES & APPROVALS: DNV-GL, Lloyds, DNV, ABS, BV Type Approval 3.1 & 3.2 Cert (on request) Standards Design and Manufacture Conform to AWWA, BS5163, DIN-F4,F5 Dimensions Conform to EN1092-2,ANSI B16.5 Face to Face dimensions Conform to EN558-1, API 594, DIN3202 Testing Conform to EN12266-1, API598 Material of gate valve Parts PART NAME Material BODY Cast Iron; Ductile Iron; Stainless Steel; Carbon steel DISC / FLAP Stainless Steel; Carbon steel; Bronze SHAFT / STEM Brass, Stainless Steel Monel; Stainless Steel Inconel SEAT / LINING NBR/EPDM/VITON SS/BRONZE BOLTS Carbon steel NUTS Stainless steel GASKET/PACKING Graphite NAME PLATE Aluminum WASHER Steel HANDWHEEL Cast Iron BUSHING/RING Cast Brass Actuation Worm-gear/hand-wheel Electric-actuator Pneumatic-actuator Hydraulic-actuator Gate valve features Advantages: Low flow resistance. Less effort when opening and closing. Large height and long opening and closing time. Water hammer phenomenon is not easy to produce. The reason is the long shutdown time. The medium can flow in any direction on both sides, easy to install. The structure length is small. The shape is simple, the structure length is short, the manufacturing process is good, and the application range is wide. The structure is compact, the valve has good rigidity, the channel is smooth, the flow resistance is small, the sealing surface is made of stainless steel and hard alloy, and the service life is long. The use of PTFE packing is reliable and easy to operate. Disadvantages The overall dimensions and opening height are large. The space required for installation is large. During the opening and closing process, there is relative friction between the sealing surfaces, which can easily cause scratches. Gate valves generally have two sealing surfaces, adding some difficulties to processing, grinding and maintenance. Related types of valves: We can also produce check valve, globe valve, knife gate valve and ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D, More video of gate valve, please see: https://www.youtube.com/watch?v=AI-LT1dy2sU