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The search is on for a missing demon dog after a young boy's Halloween decoration was snatched from his east Sacramento yard this week.

Most commonly, pressure relief valves employ a spring loaded “poppet” valve as a valve element. The poppet includes an elastomeric seal or, in some high pressure designs a thermoplastic seal, which is configured to make a seal on a valve seat. In operation, the spring and upstream pressure apply opposing forces on the valve. When the force of the upstream pressure exerts a greater force than the spring force, then the poppet moves away from the valve seat which allows fluid to pass through the outlet port. As the upstream pressure drops below the set point the valve then closes.

Brass is suited to most common applications and is usually economical. Aluminum is often specified when weight is a consideration. Plastic is considered when low cost is of primarily concern or a throw away item is required. Stainless Steels are often chosen for use with corrosive fluids, when cleanliness of the fluid is a consideration or when the operating temperatures will be high.

In many high technology applications space is limited and weight is a factor. Some manufactures specialize in miniature components and should be consulted. Material selection, particularly the relief valve body components, will impact weight. Also carefully consider the port (thread) sizes, adjustment styles, and mounting options as these will influence size and weight.

Elite triathletes completed Ironman California in Sacramento Sunday, wrapping up the busy month of October for tourism in the capitol city.

Police are investigating a terrifying attack in Woodland after a woman reportedly woke up to find her attacker in her bedroom with a knife to her throat.

Denis Papin is credited by many sources as the originator of the first pressure relief valve (circa 1679) to prevent overpressure of his steam powered “digester”. His pressure relief design consisted of a weight suspended on a lever arm. When the force of the steam pressure acting on the valve exceeded the force of the weight acting through the lever arm the valve opened. Designs requiring a higher relief pressure setting required a longer lever arm and/or larger weights. This simple system worked however more space was needed and it coud be easily tampered with leading to a possible overpressure and explosion. Another disadvantage was premature opening of the valve if the device was subjected to bouncing movement.

The Los Angeles Lakers ride a 21-0 run to open the fourth quarter against the Sacramento Kings and hang on to win 131-127 at Crypto.com Arena Saturday night.

A Sacramento mother is seeking answers—and justice—after discovering that her daughter's grave was moved without her knowledge.

A Sacramento man was sentenced to nearly 20 years in prison for trafficking fentanyl and methamphetamine, prosecutors said Thursday.

Flow RequirementsWhat is the maximum flow rate that the application requires? How much does the flow rate vary? Porting configuration and effective orifices are also important considerations.

A man was sentenced to five years of felony probation for a DUI crash that injured three people in Woodland in 2022, police said.

Elite triathletes completed Ironman California in Sacramento Sunday, wrapping up the busy month of October for tourism in the capitol city.

Relief PressuresExpected relief pressure is an important factor in determining which product is best suited to the application.

MaterialsA wide range of materials are available to handle various fluids and operating environments. Common pressure relief valve component materials include brass, plastic, and aluminum. Various grades of stainless steel (such as 303, 304, and 316) are available too. Springs used inside the relief valve are typically made of music wire (carbon steel) or stainless steel.

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CBS News California examined retail theft rates in California and whether the high-profile Proposition 36 would help combat those crimes.

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Fentanyl took her life. Frustrated with the legislature, Matt Capelouto took matters into his own hands and attempted to get Alexandra's Law on the ballot so that the public could vote on it themselves.

In operation, the pressure relief valve remains normally closed until pressures upstream reaches the desired set pressure. The valve will crack open when the set pressure is reached, and continue to open further, allowing more flow as over pressure increases. When upstream pressure falls a few psi below the set pressure, the valve will close again.

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Registered voters in California will be weighing in 10 statewide propositions and will select their next U.S. senator in the 2024 election.

TemperatureThe materials selected for the pressure relief valve not only need to be compatible with the fluid but also must be able to function properly at the expected operating temperature. The primary concern is whether or not the elastomer chosen will function properly throughout the expected temperature range. Additionally, the operating temperature may affect flow capacity and/or the spring rate in extreme applications.

Oct. 21 was the last day to register online or by mail to vote in California for the 2024 election. Here's what you need to know if you missed the deadline.

Golden 1 Center was quiet Saturday night after two attempts to hold a Rod Wave concert. First, it was canceled due to chaos. Then it was canceled due to staffing issues.

Direct acting spring valves: Timothy Hackworth is believed to be the first to use direct acting spring valves (circa 1828) on his locomotive engine called the Royal George. Timothy utilized an accordion arrangement of leaf springs, which would later be replaced with coil springs, to apply force to the valve. The spring force could be fine tuned by adjusting the nuts retaining the leaf springs.

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The Woodland Police Department seized a large stash of assault weapons from a 19-year old after being notified by his parents that he was threatening to harm himself.

Elite triathletes completed Ironman California in Sacramento on Sunday, wrapping up the busy month of October for tourism in the capitol city.

An inmate who escaped from a Northern California jail last month was located and arrested at his home on Thursday, deputies say.

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Refinements to the direct acting spring relief valve design continued in subsequent years in response to the widespread use of steam boilers to provide heat and to power locomotives, river boats, and pumps. Steam boilers are less common today but the safety relief valve continues to be a critical component, in systems with pressure vessels, to protect against damage or catastrophic failure.

In many high technology applications space is limited and weight is a factor. Some manufactures specialize in miniature components and should be consulted. Material selection, particularly the relief valve body components, will impact weight. Also carefully consider the port (thread) sizes, adjustment styles, and mounting options as these will influence size and weight.

Equally important is the compatibility of the seal material with the fluid and with the operating temperature range. Buna-N is a typical seal material. Optional seals are offered by some manufacturers and these include: Fluorocarbon, EPDM, Silicone, and Perfluoroelastomer.

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Fernando Valenzuela, known affectionately as "El Toro," has died at 63 years old. The starting pitcher led the Boys in Blue to one World Series title and still ranks amongst the franchise leaders in nearly every pitching category.

A new wildfire burning near the Nevada and Placer county line has forced officials to issue mandatory evacuations in both counties on Saturday.

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The reference force element is usually a mechanical spring. This spring exerts a force on the sensing element and acts to close the valve. Many pressure relief valves are designed with an adjustment which allows the user to adjust the relief pressure set-point by changing the force exerted by the reference spring.

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The identity of a 2-year-old boy who was killed Thursday morning in a tragic accident outside of the Bel Air grocery store in Woodland has been released.

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President Biden in Arizona issued a formal presidential apology​ for the atrocities committed during a 150-year era of forced federal Indian boarding schools.

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It was a day of conquering fears and overcoming odds at the Sacramento Deep Water Channel this weekend. People living with physical disabilities got an opportunity to feel the exhilaration of setting sail.

California voters will be asked to authorize the state to borrow $10 billion to pay for climate and environmental projects, including wildfire prevention.

Beswick Engineering manufactures four styles of pressure relief valves to best suit your application. The RVD and RVD8 are diaphragm based pressure relief valves which are suited to lower relief pressures. The RV2 and BPR valves are piston based designs.

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Direct-acting deadweight pressure relief valves: Later to avoid the disadvantages of the lever arrangement, direct-acting deadweight pressure relief valves were installed on early steam locomotives. In this design, weights were applied directly to the top of the valve mechanism. To keep the size of the weights in a reasonable range, the valve size was often undersized resulting in a smaller vent opening than required. Often an explosion would occur as the steam pressure rose faster than the vent could release excess pressure. Bouncing movements also prematurely released pressure.

Pressure relief valves (safety relief valves) are designed to open at a preset pressure and discharge fluid until pressure drops to acceptable levels. The development of the safety relief valve has an interesting history.

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Brock Purdy threw a touchdown pass and ran for another score to send the San Francisco 49ers into their bye week on a high note with a 30-24 victory over the Dallas Cowboys.

Each application has its own unique requirements but before we get into the selection process, let’s have a look at the operating principles of a typical direct acting pressure relief valve.

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Woodland police say a man is in custody after leading police on a chase south on Interstate 5 near the Sacramento International airport.

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The chemical properties of the fluid should be considered before determining the best materials for your application. Each fluid will have its own unique characteristics so care must be taken to select the appropriate body and seal materials that will come in contact with the fluid. The parts of the pressure relief valve in contact with the fluid are known as the “wetted” components. If the fluid is flammable or hazardous in nature the pressure relief valve must be capable of discharging it safely.

Piston style designs are often used when higher relief pressures are required, when ruggedness is a concern or when the relief pressure does not have to be held to a tight tolerance. Piston designs tend to be more sluggish, compared to diaphragm designs due to friction from the piston seal. In low pressure applications, or when high accuracy is required, the diaphragm style is preferred. Diaphragm relief valves employ a thin disc shaped element which is used to sense pressure changes. They are usually made of an elastomer, however, thin convoluted metal is used in special applications. Diaphragms essentially eliminate the friction inherent with piston style designs. Additionally, for a particular relief valve size, it is often possible to provide a greater sensing area with a diaphragm design than would be feasible with a piston style design.

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