A trap seal is a plumbing term where water creates a seal between the appliance drain and the house piping system, preventing gases from entering the home and creating a siphon effect. Traps are found in almost any building with indoor plumbing, with the U-trap being the most common. The trap seal serves two purposes: […]
Hermetic seals prevent the entry of oxygen, moisture, and contaminants in various industries. They are used in building, food packaging, air travel, deep sea diving, and telecommunications to maintain a comfortable environment and prevent corrosion or breakage. Hermetic seals are hermetic seals that prevent the entry of oxygen, moisture, moisture and any external contaminants into […]
Compression seals prevent leakage between two objects under pressure. They fill in irregularities and prevent gases or fluids from escaping. Materials like asbestos are no longer used in the US. The best gasket thickness compensates for surface irregularities and is compressible. Overtightening can ruin sealing qualities, especially for metal gaskets like cylinder head gaskets. Auto […]
Hydraulic seals are used to contain hydraulic fluid and pressure in a cylinder. There are two types: static and dynamic, made from rubber or polyurethane. Rust and erosion can damage seals, but replacement seals can be purchased to prevent leaks. A hydraulic seal is a gasket-like device used to seal the hydraulic fluid and pressure […]
Security seals are tamper-evident devices used to restrict access to package contents. They come in various forms, including foil wrappers, push-top lids, vacuum lids, tape, plastic ties, shrink wrap, and metal tags. Seals can be engraved with serial numbers for tracking and are used to protect food products, shipping crates, cargo boxes, confidential documents, and […]
Thread sealing tape, also known as Teflon or PTFE tape, is used to create an airtight seal with plumbing fittings. It is applied by wrapping it around the outer threads of a pipe before screwing in the other component. It can be used on any system where pressure and leaks are a potential problem. Color-coded […]
A rear axle seal prevents gear lubricant from leaking out of the axle housing around the axle shaft. Early versions were made of leather or cotton rope, but modern designs use steel and rubber. To replace a leaking seal, the axle must be removed and the new seal installed with silicone and tapped into place. […]
The Kansas state seal reflects the state’s culture, history, and concerns. The current version was mandated in 1859 and includes symbols of agriculture, commerce, and migration. The seal was one of the first pieces of legislation passed by the Kansas state legislature and was included in the state flag in 1927. The state seal and […]
Georgia’s state seal, adopted in 1799, represents the state’s natural resources and dedication to justice and the US Constitution. The seal is the binding sign of official state documents, overseen by the secretary of state, and has been concealed twice to protect its authority. In 1868, Secretary of State Nathan Barrett hid the seal to […]
Dry gas seals are used to seal centrifugal compressor shafts in harsh industrial environments without the need for lubricating oil. Gas seal failure can occur due to various reasons, and the design of the gas seal is critical to its function. John Crane Inc. patented the spiral groove design in 1968, which reduced friction without […]
Lip seals are mechanical devices used to seal shaft output points on rotary and reciprocating machinery. They consist of a rigid outer shell and a flexible inner member made of rubber. Lip seals prevent dust and moisture from entering the internal workings of machinery without affecting performance. They are press-fitted into machine end shields and […]
The Michigan state seal was designed in 1835 by Lewis Cass and depicts a man holding a gun and a peace symbol, with an eagle above holding an olive branch and three arrows. It can only be used on 15 official documents and at government events. The state motto, Teubor, means “I will defend.” The […]
North Carolina had an official seal since 1633, with most created under the direction of the King of England. The state seal features Liberty and Plenty, added in 1778, and was modified in 1983 to include important dates and the state motto. North Carolina is one of the original 13 colonies of the United States, […]
The state seal of Colorado is based on the Territorial Seal of Colorado, with the title and date changed. It features symbols of God, government, and Colorado’s mountains and mining industry, with the state motto “Nil Sine Numine.” The design was created by Lewis Leyward Weld and Governor William Gilpin, who studied medieval heraldry. The […]
The Good Housekeeping Seal is an endorsement by the magazine for products that meet its criteria. The seal is awarded by the Good Housekeeping Research Institute, which tests products to verify their usefulness and value for consumers. The seal can influence purchasing decisions and there is also a Good Housekeeping Green Seal for environmentally-friendly products. […]
The Virginia state seal, dating back to 1776, features classical symbols and the motto “sic semper tyrannis.” The front shows Virtus defeating a fallen tyrant, while the reverse depicts Libertas, Ceres, and Aeternitas. The seal’s nudity has caused minor controversy. The state seal of Virginia is one of the oldest state symbols in the United […]
Oregon had two previous seals, designed to be politically neutral due to a border dispute with Great Britain. The state’s new seal, mandated by the constitution in 1857, had political symbolism, including a moose, eagle, and images of the Pacific Ocean, mountains, and a covered wagon. The seal also includes elements reflecting Oregon’s mining and […]
Alabama’s current state seal, approved in 1939, is the same as the one used when it became a state in 1819. During the Civil War, Alabama was part of the Confederacy and retired its state seal. The new seal featured the coat of arms of the United States and an eagle. Alabama was granted statehood […]
The Oklahoma state seal features five Indian tribes, with a central star showing a Caucasian and Native American shaking hands. The seal also includes state symbols such as the scissor-tailed flycatcher and the redbud tree. Oklahoma’s state seal focuses on the five Indian nations that inhabit the region. A large five-pointed star graces the center […]
Maryland’s state seal has a long history, with the first official seal being brought from England in the 1600s. The current seal has both an obverse and reverse, with the reverse being more commonly used. The seal has been replaced and changed several times, with the current version featuring Calvert’s coat of arms and Lord […]
