OLE Sales Training Snubbers Part 1 and 2 PDF

Product Overview – Snubbers Part 1 of 2 Professional Development May 29, 2024 1 Objectives Explain the Primary Purpose for Snubbers Explain how Snubbers work Review Core Hydraulic Fundamentals as it related to Snubbers...

Product Overview – Snubbers Part 1 of 2 Professional Development May 29, 2024 1 Objectives Explain the Primary Purpose for Snubbers Explain how Snubbers work Review Core Hydraulic Fundamentals as it related to Snubbers 2 Snubbers – What are they…Why do We Need Them? A Snubber can be defined as a rotary hydraulic “dampening” device. It is a self-contained unit with no external power source required. It provides a Resistive Force to a moving load (Dipper Door). The dampening function occurs by restricting flow though an orifice (a screw in cartridge valve) at a specific pressure. 3 Snubbers – What is it and Why do We Need Them? The pressure setting, along with the viscosity of the fluid used, maintains the dampening force available throughout the cycle of operation. Maintaining proper fluid level is critical as any external leakage could negatively impact performance. Any Internal leakage must be kept to a minimum to retain snubber dampening performance. 4 Snubbers – What is it and Why do We Need Them? Keep in mind, while the snubber is in operation restricting fluid flow will generate heat. As the oil temperature rises, the oil properties change, and it begins to get thinner. This will increase the volume of fluid that is allowed to pass through any internal leak paths at a given pressure. 5 Snubbers – How They Work In order for a snubber to work properly it must maintain good sealing properties. 6  Snubbers – How They Work Critical items include the following: Rotating Vane Wiper Seal Rotating Vane Paddle (Rotary Vane Seal) Stationary Vane Wiper Seal O - Ring Seals Stationary Vane 7  Snubbers – How They Work Stationary Vane Wiper Seal Screw in Cartridge Valve (Pressure Control) 8  Snubbers – How They Work Paddle (Rotary Vane Seal) Rotating Vane Wiper Seal Rotating Vane 9 Hydraulic Fundamentals Pascal’s Law: Pressure exerted on a confined fluid is transmitted undiminished in all directions, acts with equal force on all equal areas, and acts at right angles to those areas. 10 Hydraulic Fundamentals Pascals Law as it applies to snubbers: The Dipper Door generates the Force The Area is the surface “face” of the rotating vane Because liquids are not compressible… Pressure is created [as a resistance to flow] when the dipper door moves the rotary vane by way of a splined shaft and the snubber arm. Force = Pressure x Area F Pressure = Force / Area P A Area = Force / Pressure 11 Hydraulic Fundamentals Pascals Law as it applies to snubbers (Cont.): When in motion, fluid seeks the path of least resistance, it is forced through the cartridge valve (in the fixed vane) in addition to any of the other pathways: Clearance areas between paddle seals Tolerances between vane wiper seals Leaks around O-rings Any other area where pressurized fluid can escape to a lower body of pressure 12 Hydraulic Fundamentals Bernoulli's Flow Forces Three things that affect the flow of fluid across an orifice: 1.Viscosity of the oil 2.The size of the orifice 3.The Pressure Drop (ΔP) across the orifice 13  Snubbers – How They Work With no force applied (no movement) there is a balance of forces on both sides of the rotating vane. Zero Force in Pounds The pressure that would be read on a gauge (ignoring atmospheric pressure) would be zero. Zero Force in Pounds 14  Snubbers – How They Work With a Load force applied (start of Load Force movement) there is now an unbalance of in Pounds forces on one side of the rotating vane. Fluid on the right side of the rotating vane is resisting the rotary vane movement. As a result, pressure begins to rise on the right side of the rotating vane. Zero Force in Pounds 15  Snubbers – How They Work Once the pressure rises to the set point of the screw in cartridge valve, the valve opens and allows Load Force a restricted flow of fluid to pass in Pounds from the high-pressure side of the rotating vane (in red) to the low- pressure side of the rotating vane (in blue). 16  Snubbers – How They Work The resistive force generated by the snubber is a result of the following: Force applied by the door (weight) Pressure required to open the cartridge valve (restriction to flow) The pressure differential (ΔP) required to pass the required volume of hydraulic fluid from the high pressure to the low-pressure side of the rotary vane. Additional calculations would include accounting for the radius of the snubber arm Radius and radius of the rotating vane when working (Snubber Arm) with the value of torque (rotational force). 17 Questions ? 18 Product Overview – Snubbers Part 2 of 2 Professional Development May 29, 2024 19 Objectives Explain the OLE Snubber Business Review Key Points for Proper Snubber Installation Discuss Field Examples 20 The Evolution of the OLE Snubber Business The original Snubber to enter the marketplace was known as the “SnubRite” Dipper Snubber… 21  The Evolution of the OLE Snubber Business When OLE entered the snubber market, we created the HydroSNUB which was functionally and dimensionally identical to the SnubRite 22 The Evolution of the OLE Snubber Business Things to remember… OLE does not manufacture SnubRite components Engineering improvements in the OLE design allow the current HydroSNUB to produce more dampening force than a standard OE SnubRite product 23  The Evolution of the OLE Snubber Business What about the HD Snubber? When the patent expired for the [original] SnubRite a new larger Snubber was designed and patented… We know that unit today as the Heavy Duty SnubRite or the HD Snubber Our engineering improvements allow for better dampening force than HD Snubbers in a smaller package 24 The Evolution of the OLE Snubber Business 25 Key Points for Proper Snubber Installation Proper installation is critical for long service life Technical specifications are available in both the P&H service literature and in OLE specific installation documents. If new snubbers are not installed with the correct hardware and shimmed properly a shortened service life may occur. 26  Field Example ESCO is our largest OEM dipper manufacturer 27 Field Example 28 Field Example 29 Field Example 30 Field Example 31 Field Example 32 Field Example 33 Field Example 34 Field Example 35 Field Example 36 Field Example 37 Field Example 38 Field Example 39 Field Example 40 Field Example 41 Field Example 42 Field Example 43 Field Example 44 Field Example 45 Field Example 46 Field Example 47 Field Example 48 Field Example 49 Field Example 50 Field Example 51 Questions ? 52