In March this year, the sales manager of Caterpillar received a phone call from a Spanish customer complaining that several excavators produced by their company had small start-up faults. The repairman judged that the hydraulic system leaked oil, which should be caused by the leakage of the hydraulic check valve. The customer asked them to replace the hydraulic check valve as soon as possible. This customer accounts for 40% of Caterpillar's sales. Although it has passed the maintenance period, they must help the customer solve the problem. The original hydraulic valve supplier said that for the hydraulic check valve under this working condition, there can only be no leakage for 2-12 months. In extreme cases, it may be less than 2 months. The customer was disappointed with such a maintenance plan. The owner asked Mark, the purchasing manager, to find a solution satisfying the customer. Mark contacted more than 10 hydraulic valve manufacturers, but did not get a satisfactory reply. He owner urged him to make a new plan twice a day. Mark thought of AAK HYDRAULIC VALVE he had contacted before. Maybe AAK can do some help. He firstly asked us why so many hydraulic valve manufacturers can't achieve 0 leakage for more than 12 months for this style of hydraulic check valve? The hydraulic check valves often use steel ball or metal cone slide valve to contact and compress with the orifice of metal valve seat under the action of spring and fluid pressure to prevent the reverse flow of liquid, but it is difficult to achieve absolute seamless butt joint in the cutting of metal contact surface. Especially under the special working condition of this customer, it is more difficult to avoid leakage. This hydraulic valve manufacturer who has insured for 2 months is already great. Mark thought that AAK HYDRAULIC VALVE could not produce a hydraulic check valve with 0 leakage for more than 1 year, and asked how long we could insure at most. AAK can produce hydraulic check valve with 0 leakage for more than 12 months. If there is no leakage within 1 month, and if subsequent maintenance is in place, the hydraulic check valve can be 0 leakage for 24 months. Mark was surprised at our reply and thought we were joking. Let's talk about it with facts: AAK will send the hydraulic check valve samples within 20 days, you test the hydraulic check valve first, and we will then discuss it after the test. After 15 days, AAK sent the hydraulic check valve samples to Caterpillar. Their engineers conducted internal test first, and there were no abnormalities in many tests. Their after-sales personnel took the samples directly to the customer's construction site for on-site installation and commissioning. It worked continuously for 12 hours, and everything was still normal.
When I got up to go to the bathroom at 1 a.m. last Monday, my wechat phone rang. It was from Carl, the purchasing manager of Denison hydraulic pump company in the United States. I was very surprised by this phone call. Generally, we communicate with Carl in the form of e-mail and have never used wechat phone. Carl firstly said sorry to disturb my rest, and asked if I could arrange a video conference at 8:00 tomorrow morning. He needs to discuss a troublesome problem with our technical team. I'm concerned that the communication on the phone will not be clear, and asked him to send me a written email first, and then I'll reply to him. Half an hour later, a detailed email with a schematic diagram of the hydraulic system came in. Last week, the hydraulic pump supplied by them encountered problems with his customer. The customer's hydraulic system has been shelved for half a year, and now it needs to be driven. After the operator starts the hydraulic pump, there is no pressure in the hydraulic system. The field engineer judged that there was no flow output of the hydraulic pump, but after inspection, it was found that the rotation direction of the motor was consistent with that of the hydraulic pump, and the oil level, oil temperature and viscosity of the hydraulic pump met the working conditions. The suction system of the hydraulic pump was replaced, including the oil suction pipe and filter. After startup, there was still no flow output. The transmission parts inside the hydraulic pump are intact without falling off, fracture and blade jamming. A week has passed and no reason has been found. Because the hydraulic pump is still in the warranty period, if it cannot be solved in another week, it can only be returned for claim. Carl asked the original supplier of each part for the hydraulic pump and got nothing. After reading the email, I asked him if the hydraulic pump used a hydraulic check valve? Carl said that the hydraulic check valve was provided by HAWE company in the United States, but the after-sales period of the hydraulic check valve has expired. Because AAK supplied hydraulic check valves to their company last year, and the quality was very satisfying, although the hydraulic check valve in this hydraulic pump is not from AAK, he wants to see if AAK technical team can find out the reason. I said there was no problem with the 8:00 video conference tomorrow, because the chief engineer of AAK didn't travel, but I'm not sure if we can help. The next day in the video conference, their engineers showed the whole system. Our chief engineer found that the displacement of the hydraulic pump was 8ml / R, so he asked them to fill the hydraulic pump directly in the oil outlet pipeline, and then start it up. The hydraulic pump still had no flow.
A tiny detail of the hydraulic check valve symbol direction is wrong, which put the hydraulic check valve manufacturer in a very difficult position, the factory is almost closed. There is a devil in the details. Whether you can grasp the devil of the hydraulic check valve symbol requires you to think every day, in addition to hydraulic check valve, hydraulic check valve, and still hydraulic check valve. When I opened the mailbox, I saw the e-mail of Adair who we had known for 3 years. There was a habit with Adair. He purchases only one type of hydraulic valves from each one hydraulic valve manufacturer. We AAK HYDRAULIC VALVE has been his supplier for the hydraulic pressure valves. After reading the email, it was actually a proofing request for a hydraulic check valve, not a hydraulic pressure valve. It was a little abnormal. I thought he sent the wrong email. I reminded him whether the e-mail was sent by mistake. He said bluntly that he would need 3 samples of the hydraulic check valve as soon as possible, according to the drawings in his email. Somehow, I always felt there was a problem somewhere, and I went to see the drawing of the hydraulic check valve. It is found that in the layout at the bottom of the drawing, the arrow direction on the hydraulic check valve symbol is reversed. For the hydraulic check valve symbol, the arrow direction is reversed, which is fatal. It seems that a designer is unlikely to make such a low-level mistake. When the technical team got the drawing and started proofing, they called me. The hydraulic check valve symbol on the drawing seemed wrong. I'm glad they can also find that there is an objection to the hydraulic check valve symbol. I asked what they think of the hydraulic check valve symbol. They suggested making two sets of samples, one according to the hydraulic check valve symbol on the customer's drawing, and the other is for the hydraulic check valve symbol we understand. When Adair received two sets of samples, he deliberately asked why they were two sets of samples. When we pointed out the details of the hydraulic check valve symbol, Adair began to tell me the devil's story of the hydraulic check valve symbol. 6 months ago, he sent his hydraulic valve manufacturer the drawing with this hydraulic check valve symbol, which was made by their chief designer overnight. The hydraulic valve manufacturer proofed according to this drawing. As a result, the hydraulic check valve sample was also approved at one time. The devil began to make trouble from this time. The 2,000 hydraulic check valves were produced and shipped to his customer. The customer is testing a new production line and needs to use these hydraulic check valves. After installation, there is a big problem in startup and commissioning. Because of the wrong direction, the medium returned, polluting the whole new production line, and directly causing a loss of more than 260,000 US dollars.
Size - 15mm to 50mm Application - Oil And Gas, Refinery, Petrochemical, Steel Sectors,Power, Spring - SS 302 Gasket - Spiral wound SS type 304 with graphite filler Class - 800 Cap Screws - ASTM A193 Gr. B7 Identification Plate Aluminium (anodised) Face to Face - AWE B 16.10 Testing Std. - API S98 Mfg. Std. - AP1602, BS 5352 Body - ASTM A105, in-situ stellited seat Cover - ASTM A105 Piston Disc - ASTM A276 Type3 04 Efficient name in the industry involved in offering the optimum quality of Forge Steel Check Valve.
Application - Oil & Gas, Reginery, Petrochemical, Pharmaceutical, Chemicals Design - BS 1868, ASME B16.34 Face to Face - ASME B16.10 Flanges - ASME B16.5 For 2 inch To 24 inch Testing - API 598 Rating Asme - B16.34
Material - Cast iron Velocity Type - Zero Velocity Non Slamming Characteristics Sizes - From 2" To 80" Diameter. Seated Type - Soft Seated and Metal to Metal Seated Application - Refinery, Petrochemical, Steel Sectors,Textile With vast industrial experience, we are involved in offering a wide range of Industrial Valve. Size Inches (ON) Ao mm Bo mm C mm 010 LuglRg mm D2o Wafer mm Eo P.C.0 mm N do mm 2 " (50) 50 60 60 152.4 105 120.6 4 19 3" (80) 76 90 73 190.5 134 152.4 4 19 4" (100) 100 114 73 228.6 172 190.5 8 19 5" (125) 125 135 83 254 196 215.9 8 22 6" (150) 150 168 98 279.4 222 241.3 8 22 8" (200) 200 215 127 342.9 279 298.4 8 22 10" (250) 250 265 146 406.4 340 362 12 25 12" (300) 300 315 181 482.6 409 431.8 12 25 14" (350 350 365 184 533.4 450 476.2 12 29
Product name: Check valve. Type: Check Valve Full port design,bolt bonnet type,pressure sealed type. single plate wafer type,dual plate check valve wafer type Design: BS1868.API6D,API594 Material:Available in Forging for NPS 2 (A105, A182 F304, F304L, F316, F316L, F51, F53, A350 LF2, LF3, LF5,F904), Casting (A216 WCB, A351 CF3, CF8, CF3M, CF8M, A995 4A, 5A, A352 LCB, LCC, LC2,WCC,WC5,C5,WC6,WC9,WC11,WC12,),CD-4MCU,SS2205 . Monel, Inconel, Hastelloy B61,B62,copper,Bronze etc. Nominal size: 2-48 Inch. Nominal pressure class: CLASS 800LB, 150LB, 300LB,600LB,900LB,1500LB, 2500LB HS Code: 84813000 End Connection: RF flange.wafer type,Butt Welded connection. DESIGN STANDARD Design & manufacture according to API 6D, BS 1868,API594 Face-to-face according to ASME B16.10 End Connection according to ASME B16.5 (RF & RTJ), ASME B16.25 (BW) Test & inspection according to API 598 Also available per NACE MR-0175, NACE MR-0103
Forged Check Valve NPS 3/8"~4" ANSI CLASS 800~2500 Type: bolted bonnet type,welded bonnet type, pressure sealed type Body MATERIAL: A105, LF2, F304, F316, F304L, F316L, F321/F347/F11/F22/F5/F91,A350 LF2/LF1,EN12516 1.0619, 1.4408,1.4308,1.0460,1.4550,1.44011.4301,1.4304,1.4404,1.4021,etc. Trim materials:TRIM NO.1,TRIM NO.5,TRIM NO.8,TRIM NO.12etc. DESIGN Std: API 602, BS5352 END CONNECTION Std: ASME B16.11, ASME B1.20.1 TEST Std: API6D,API598,EN12266,DIN3230 etc. DESIGN STANDARD Design & manufacture according to API 602, ASME B16.34 End flanges according to ASME B16.11 (SW), ASME B1.20.1 (NPT) ASME B16.25 (BW) Test & inspection according to API 598 Also available per NACE MR-0175, NACE MR-0103
Product name: Check valve. Type: Check Valve Full port design,bolt bonnet type,pressure sealed type. Piston type,swing type,lift type,dual plate wafer type,single plate wafer type Design: BS1868.API6D Material:Available in Forging for NPS 2 (A105, A182 F304, F304L, F316, F316L, F51, F53, A350 LF2, LF3, LF5,F904), Casting (A216 WCB, A351 CF3, CF8, CF3M, CF8M, A995 4A, 5A, A352 LCB, LCC, LC2,WCC,WC5,C5,WC6,WC9,WC11,WC12,),CD-4MCU,SS2205 . Monel, Inconel, Hastelloy B61,B62,copper,Bronze etc. Nominal size: 2-48 Inch. Nominal pressure class: CLASS 800LB, 150LB, 300LB,600LB,900LB,1500LB, 2500LB HS Code: 84813000 End Connection: RF flange.wafer type,Butt Welded connection. DESIGN STANDARD Design & manufacture according to API 6D, BS 1868,API594 Face-to-face according to ASME B16.10 End Connection according to ASME B16.5 (RF & RTJ), ASME B16.25 (BW) Test & inspection according to API 598 Also available per NACE MR-0175, NACE MR-0103 Product Range Body material: Carbon Steel, Stainless Steel, Alloy Steel.duplex stainless steel,B61,B62,copper,WCB,LCB,LCC,WCC,WC5,C5,WC6,WC9,WC11,CF8,CF8M,CF3,CF3M,CD-4MCU,SS2205 etc. Normal diameter: 2 - 48 Inch (DN50 - DN800). End connection: BW, Flanged. Pressure range: 150 - 2500 LB (PN16 - PN420). Working temperature: -196 - +573
Product name: Check valve. Type: Check Valve Full port design,bolt bonnet type,pressure sealed type. Piston type,swing type,lift type,dual plate wafer type,single plate wafer type Design: BS1868.API6D Material:Available in� Forging for NPS â?¤ 2 (A105, A182 F304, F304L, F316, F316L, F51, F53, A350 LF2, LF3, LF5,F904),� Casting (A216 WCB, A351 CF3, CF8, CF3M, CF8M, A995 4A, 5A, A352 LCB, LCC, LC2,WCC,WC5,C5,WC6,WC9,WC11,WC12,),CD-4MCU,SS2205 . Monel, Inconel, Hastelloy B61,B62,copper,Bronze etc. Nominal size: 2-48 Inch. Nominal pressure class: CLASS 800LB, 150LB, 300LB,600LB,900LB,1500LB, 2500LB HS Code: 84813000 End Connection: RF flange.wafer type,Butt Welded connection. DESIGN STANDARD Design & manufacture according to API 6D, BS 1868,API594 Face-to-face according to ASME B16.10 End Connection according to ASME B16.5 (RF & RTJ), ASME B16.25 (BW) Test & inspection according to API 598 Also available per NACE MR-0175, NACE MR-0103 Product Range Body material: Carbon Steel, Stainless Steel, Alloy Steel.duplex stainless steel,B61,B62,copper,WCB,LCB,LCC,WCC,WC5,C5,WC6,WC9,WC11,CF8,CF8M,CF3,CF3M,CD-4MCU,SS2205 etc. Normal diameter: 2 - 48 Inch (DN50 - DN800). End connection: BW, Flanged. Pressure range: 150 - 2500 LB (PN16 - PN420). Working temperature: -196 - +573
check valves are mechanical device allowing fluid to flow through it in one direction. These valves have two ports or two openings. From one opening the fluid enters while from the other the fluid leaves. These valves have many applications.
check valves are mechanical device allowing fluid to flow through it in one direction. These valves have two ports or two openings. From one opening the fluid enters while from the other the fluid leaves. These valves have many applications.
TECHNICAL DESCRIPTION Size 0.5" TO 2" (15mm to 50mm) Pressure Class ASME Class 150 - 2500 End Connection Flange / Socket Weld / Screwed Design Standard BS 5352 / ASME B 16.34 OUR RANGE IBR compliant NACE compliant MOC: Forged Carbon Steel / Forged Stainless Steel / Forged Alloy Steel
TECHNICAL DESCRIPTION Size �½" TO 8" (15mm to 200mm) Pressure Class ASME 150 End Connection Wafer Design Standard API 6D OUR RANGE MOC: Stainless Steel / Alloy Steel Available in Wafer Design / Dual Plate/ Non-Slamming Design
TECHNICAL DESCRIPTION Size 3" TO 14" (80mm to 350mm) Flange Standard Conformity ASME Class 150 / DIN / PN 10 / PN 16 / BS 10 TABLE D,E,F End Connection Wafer Pressure Class ASME Class 150 Design Standard API 594 / API 6D OUR RANGE MOC: Cast Iron / Carbon Steel / Stainless Steel Seal Rings: EPDM / NITRILE / VITON / SILICON Available in Wafer Design / Dual Plate / Non-Slamming Design
TECHNICAL DESCRIPTION Size 1.5" TO 24" (40mm to 600mm) Flange Standard Conformity ASME Class 150 / DIN / PN 10 / PN 16 / BS 10 TABLE D,E,F End Connection Wafer Design Standard API 6D OUR RANGE MOC: Cast Iron / Carbon Steel / Stainless Steel Seal Rings: EPDM / NITRILE / VITON / SILICON Available in Wafer Design / Dual Plate / Non-Slamming Design
TECHNICAL DESCRIPTION Size 1.5" TO 26" (40mm to 600mm) Pressure Class ASME Class 150 to 2500 End Connection Flange / Screwd / Socket Weld / Butt Weld Design Standard BS 1868 / BS 5352 OUR RANGE MOC: Cast Iron / Carbon Steel / Stainless Steel Available in Wafer Design / Dual Plate / Non-Slamming Design High Pressure valve available on request
Size: DN50-DN300; Design standardï¼?EN12334 Connection flange: EN1092, ISO7005, ASME B16.1; Face to face: EN558 (48 serial); Testing standard: EN 12266-1 Working pressure: PN10/16: DN50-DN300
Size: DN50-DN300; Design standard: EN12334; Connection standard: EN1092, ISO7005, ASME B16.1; Face to face: EN558 (48 serial, 16 serial ); Testing standard: EN 12266-1; Working pressure: PN10/16/25: DN50-DN300
Size: DN40-DN1200 Design standard EN12334, API594 Connection standard EN1092, ISO7005, ASME B16.1 Face to face ISO 5752 series 16, EN558 series 16, ASME B16.10 Testing standard EN12266-1, API598 Working pressure PN10/16: DN40-DN1200 PN25: DN40-DN600 150psi:1.5"-48", 250psi:1.5"-36"
