Valve Packing Composition for VOC-Free Leak Repair Reuse
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Solution Overview
Problem
Current valve packing replacement materials contain volatile organic compounds (VOCs), harden upon insertion, and often require a second drill and tap procedure for re-use, leading to increased costs and safety risks due to potential VOC exposure and inefficiency in leak repair.
Innovation Solution
A valve packing repair composition comprising calcium sulfonate complex grease with polyalphaolefin, anti-wear/anti-galling agents, binding/thickening agents, and a high molecular weight plasticizing agent, which is miscible with the grease, allowing for re-use without a second drill and tap procedure and maintaining pliability under high pressure and temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current valve packing replacement materials are used, then the valve leak can be repaired, but the materials contain VOCs which pose environmental and safety risks
Solution Approach 1:
The patent changes the chemical composition parameters of the packing material by using a sulfur-molybdenum complex grease base instead of traditional petroleum-based greases. This fundamental parameter change eliminates VOCs while maintaining the lubrication and sealing properties necessary for effective leak repair.
Solution Approach 2:
The patent creates a composite material system combining sulfur-molybdenum complex grease with specific additives including anti-wear agents, extreme pressure agents, and viscosity modifiers. This composite approach achieves both environmental compliance (no VOCs) and functional performance (effective leak repair) simultaneously.
2Reliability
If traditional valve packing materials are used, then the initial repair can be performed, but the material hardens upon insertion requiring a second drill and tap procedure for re-use
Solution Approach 1:
The patent modifies the physical state parameters of the packing material through the use of sulfur-molybdenum complex grease combined with specific viscosity modifiers. This maintains the material in a pliable, non-hardening state even under high temperature and pressure conditions, enabling repeated adjustments without requiring a second drill and tap procedure.
3Reliability
If a second drill and tap procedure is performed for re-use, then the valve can be repaired again, but the process becomes more difficult and exposes technicians to higher VOC risks
Solution Approach 1:
The sulfur-molybdenum complex grease packing material provides self-maintaining properties where the extreme pressure and anti-wear agents continue to protect the valve stem and packing interface during repeated adjustments. This self-protecting characteristic eliminates the need for additional drill and tap procedures, reducing both procedural complexity and technician exposure risks.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition effectively repairs leaking valves without VOC exposure risks, reduces downtime, and maintains performance under harsh conditions, adhering to regulatory standards for fugitive emissions and allowing for repeated adjustments.
Implementation Method 1
a high molecular weight plasticizing agent, wherein the plasticizing agent is miscible with the sulfonate complex grease
Implementation Method 2
maintains performance under harsh conditions
Implementation Method 3
calcium sulfonate complex grease with polyalphaolefin, anti-wear/anti-galling agents
Implementation Method 4
anti-wear/anti-galling agents
Implementation Method 5
anti-wear/anti-galling agents
Data Source
AI summary
A non-curable injectable ester containing packing material for use in the repair of leaking valves contains a calcium sulfonate grease containing at least one polyalphaolefin, an ester, an anti-wear/anti-galling agent, a binding/thickening agent and a plasticizing agent.