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#Valve stem upgrade
#Valve stem code

Young C, Budynas R (2002) Roark’s formulas for stress and strain, 7th edn.

#Valve stem code

ASME Boiler and Pressure Vessel Code Section VIII, Division II, ASME, New York ASME Boiler and Pressure Vessel Code Section VIII, Division II, ASME, New YorkĪmerican Society of Mechanical Engineers (2004) Rules for construction of pressure vessels, alternative rules. Accessed 10 Sept 2018Īmerican Society of Mechanical Engineers (2017) Materials, part D. Piping Engineering (2018) Maximum allowable stem torque. International Organization for Organization (ISO) (2007) Pipeline transportation systems: pipeline valves, 2nd edn. ISO, GenevaĪmerican Petroleum Institute (API) (2014) Specification for pipeline and piping valves, 24th edn. International Organization for Organization (ISO) (2011) Petroleum and natural gas industries: mechanical integrity and sizing of actuators and mounting kits for pipeline valves, 1st edn. The stem key material is assumed to be the same as the stem material in this paper, which is UNS S41500, ASTM A182 F6NM before changing the stem material and Inconel 718 in case of upgrading the stem material.Īmerican Petroleum Institute (API) (2012) Standard for actuator sizing and mounting kits for pipeline valves, 1st edn. Changing the stem material will increase the stem torque values in other parts of stem including the rounded part with keys, the circular part, and stem keys to 468,958 Nm, 2,517,112 Nm, and 1,621,406 Nm, respectively. The MAST value in the rectangular area in Inconel 718 has been increased to 332,579.2 Nm, which is more than the actuator torque. Improving the material to Inconel 718 increases the MAST in all four parts of the stem which are rectangular area, rounded part with keys, circular part and stem keys. The average yield strength of this material is 130 Ksi equal to 896.3 N/mm 2.

Based on the analysis, we determine the material used, considering the durometer (relative hardness) of the rubber, temperature requirements (both extreme heat and extreme cold), resistance to common oil types, tear-resistance and leak rate. The alternative is to change the stem material from ASTM A182 F6NM, 13%Cr 4%Ni to Inconel 718. Fel-Pro engineers analyze the OE design for every application.

The second solution, which is more expensive, improves the MAST of the stem in all four sections of the circular section with stem keys, stem keys, the circular section, and the rectangular section.

#Valve stem upgrade

Two solutions are proposed in this paper one is to increase the rectangular section diameter, and the second is to upgrade the material to a higher strength option such as Inconel 718. Why Buy: The only Tire Pressure Monitoring System Valve Stem Cap recommended by Ford Motor Company for Ford, Lincoln and Mercury vehicles. The result of this calculation shows that the MAST in rectangular section of stem is less than the actuator torque. This paper provides a formula for calculation of MAST in different sections of a valve stem installed on an oil export pipeline. The actuator is a component or machine installed on the valve that is responsible for moving (e.g., opening or closing) the valve. The important point is that the actuator maximum output torque/thrust based on the maximum supply voltage or operating pressure generated by the actuator should not exceed the valve MAST at any point of travel. The valve train consists of all parts of the valve drive between the operator and closure member, including the closure member but excluding the valve operator such as the gearbox. Otherwise, it will not be in line with the lubricator.Maximum allowable stem torque/thrust (MAST) is defined as the maximum torque/thrust that can be applied to the valve train without risk of damage, as defined by the valve manufacturer/supplier. Only correct number of rings can place below the lantern ring.

Check how many rings you need to put below the lantern ring.

Wind the packing material round the mandrel as many times as the number of rings required.

Calculate how many rings will be required by measuring the gap between the shaft and the stuffing box, the depth of the stuffing box and the thickness of the lantern ring.

Brush down and then wipe the area with a clean rag.

Clean the shaft well using a non-flammable, non-toxic solvent.

Make sure all packing scraps have been removed.

If there is a lantern ring, remove this with a piece of wire bent into a hook.

Remove the packing rings using packing tools, without scratching the shaft.

Open the gland follower dog bolts & open the gland follower.

The first step of repacking is removing the old pack and then cleaning the gland and then installing the new pack. We have to repack the valve if we cannot control the leakage by adjusting the gland follower.