A check valve is a valve whose switching parts are disc-shaped and rely on their own weight and medium pressure to produce the effect of stopping the medium from flowing back. It is an automatic valve, also known as a one-way valve, check valve, backflow valve, or isolation valve. The commonly used check valves are as follows.
Swing check valve
Swing check valves have a disc-shaped valve flap and rotate around the axis of the valve seat channel. Because the internal passage of the valve is streamlined, the flow resistance is higher than that of a lift check valve. Small size, suitable for medium, small diameter, low pressure, and large diameter pipeline (large diameter case flow rate is low and infrequent flow changes). Sealing performance is not as good as lifting type.
1. Swing check valve is divided into three types: single valve, double valve, and multi-flap type. These three types are mainly divided according to the diameter of the valve. The purpose is to prevent the media from stopping or backflowing and to reduce the hydraulic shock. Single-valve swing check valves are usually used in medium diameter applications. When a single-valve swing check valve is used for large diameter pipelines, it is best to use a slow-closing check valve in order to reduce water hammer pressure. Double-flap swing check valves are suitable for medium and large-diameter pipelines. Buttress double-flap swing check valve, small structure, lightweight, is a fast developing check valve; multi-flap swing check valve is suitable for large diameter pipeline.
2.The installation position of the swing check valve is not restricted, it can be installed on horizontal, vertical, or inclined pipelines.
Brass Swing Check Valve BS 5154 Pressure Rating : PN-20 Material : Forged Brass Description : Screwed in Cover Ends : Screwed Female to BS:21 Item Code : FLB00045 Size : 15mm Notes : Available Valve Size : 15mm to 50mm
Brass Universal Check Valve BS 5154 Pressure Rating : PN-20 Material : Forged Brass Description : One Piece Body, Spring Loaded, Resilient Seated Ends : Screwed Female to BS:21 Specials : Suitable for Horizontal & Vertical Installation Item Code : FLB00048 Size : 15mm Notes : Available Valve Size : 15mm to 50mm
Forged Steel Check Valve BSEN ISO 15761, ASME B16.34 Pressure Rating : Class-800 Bore : Full & Regular Material : Forged Steel (A105) Description : Bolted Cover (Welded Cover for CL-1500 & 2500) Ends : Socket Weld, Butt Weld, Screwed Specials : LT & Cryo, Fire Safe, Seismic, IBR Item Code : FCS00012 Size : 15mm Notes : Available Valve Size : CLASS-800 8mm to 50mm CLASS-1500 15mm to 40mm CLASS-2500 15mm to 25mm Material : LF2, F5, F9, F11, F22, F304, F304L, F304H, F316, F316L, F316H, F91, F51, F321H, F321
Forged Steel Check Valve BSEN ISO 15761 Pressure Rating : Class-150 Material : Forged Steel (A105) Description : Bolted Cover Ends : Welded on Flanges Specials : LT & Cryo, Fire Safe, Seismic, IBR Item Code : FCS00035 Size : 15mm Notes : Available Valve Size : CLASS-150 15mm to 50mm CLASS-300 15mm to 50mm CLASS-600 15mm to 50mm Material : LF2, F5, F9, F11, F22, F304, F304L, F304H, F316, F316L, F316H, F91, F51, F321H, F321
Gun Metal Swing Check Valve BS 5154 Pressure Rating : Class-150 Material : Gun Metal, Bronze Description : Screwed in Cover Ends : Flanged Item Code : GM000047 Size : 15mm Notes : Available Valve Size : 15mm to 100mm
Gun Metal Swing Check Valve BS 5154 Pressure Rating : PN-20 Material : Gun Metal, Bronze Description : Screwed in Cover Ends : Screwed Female to BS:21 Item Code : GM000045 Size : 15mm Notes : Available Valve Size : 15mm to 100mm
Cast Iron Swing Check Valve Pressure Rating : Class-125 Material : Cast Iron / Ductile Iron Description : Bolted Cover Trim : Gun Metal Ends : Flanged Specials : Dash pot arrangement, By pass arrangement Item Code : CI000017 Size : 25mm Notes : Available Valve Size : 25mm to 600mm
Cast Steel Horizontal Check Valve DIN 2401, BSEN 13709 Pressure Rating : PN-40 Material : Cast Steel (WCB) Description : Horizontal Type, Bolted Cover Ends : Flanged, Butt Weld Specials : IBR Item Code : CCS00011 Size : 15mm Notes : Available Valve Size : 15mm to 200mm Material : LCB, WC1, WC6, WC9, C5, C12, C12A, CF8, CF8C, CF8M, CF3, CF3M, CN7M, CF10, CF10M, 3A, 4A, 5A, 6A etc.
Cast Steel Swing Check Valve API 6D, BS 1868, ASME B16.34 Pressure Rating : Class-150 Material : Cast Steel (WCB) Description : Swing Type, Bolted Cover (Pressure Seal Cover CL-900, 1500 &; 2500) Ends : Flanged, Butt Weld Specials : Fire Safe, Dash Pot Arrangement, By pass Arrangement, IBR Item Code : CCS00007 Size : 50mm Notes : Available Valve Size : CLASS-150 40mm to 900mm CLASS-30040mm to 950mm CLASS-600 40mm to 600mm CLASS-900 40mm to 600mm CLASS-1500� � 40mm to 600mm CLASS-2500 50mm to 300mm Material : LCB, WC1, WC6, WC9, C5, C12, C12A, CF8, CF8C, CF8M, CF3, CF3M, CN7M, CF10, CF10M, 3A, 4A, 5A, 6A etc.
Carbon Steel Accessible Feed Check Valve Rating : Max. BOP 350 PSIG (24.1 Bar) at 800 F (427 C) Material : Carbon Steel Description : Angle Pattern, Without inspection Branch Straight inlet Trim : SS410 + Stellite Ends : Flanged Operator : Hand wheel Specials : IBR Item Code : BM000050 Size : 40mm Notes : Available Valve Size : 40mm to 80mm
