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This Control Devices VR25-100 vacuum relief valve has a brass body, an adjustable relief pressure, and a 1/4" male NPT threaded inlet connection. The valve's brass body, stainless steel spring, nylon poppet, and Nitrile seal resist corrosion and can be used in operating temperatures up to 250 degrees F. This proportional-type relief valve opens at a rate relative to the increase in vacuum pressure, and can be adjusted to open between 0 and 30" Hg (inches of mercury) using the knurled adjustment screw and locking jam nut. The valve is factory preset to open at 20 pounds per square inch (psi) and has a flow rate of 2 cubic feet per minute (CFM). This vacuum relief valve is suitable for use in vacuum applications such as to prevent a tank from collapsing while it is being emptied or after a sterilization-in-place (SIP) procedure.
Relief valves remove excess pressure or vacuum from a system. The valve openings allow fluids or gases to escape to decrease pressure, and then close once the valve reaches the reseating pressure limit. They also relieve excess vacuum by opening to release a gas into the system and then closing after it reaches its low-pressure limit. Some relief valves have an adjustment mechanism to set the pressure where the valve opens, making it suitable for various applications. Relief valves are rated according to the volume of liquid or gas that can flow through them and the material that the valve is constructed from must be suitable for the fluid or gas, which may be corrosive or at an extreme temperature, in which it operates. Relief valves are used in a variety of applications, such as air compressors, petrochemical and chemical manufacturing, natural gas processing, and power generation.
Control Devices manufactures valves and other flow control devices. The company, founded in 1963, is headquartered in Fenton, MO.
J. Hamilton
2025-08-31 17:34:22
I am using this with a yeast system that includes a silonide and regulator. This is used to prevent to much pressure developing in the yeast bottle. It functions perfectly. This system is far easier to adjust then any pressurized CO2 system. Along with the fishmate feeder I can take off for a couple of weeks vacation an be confident that my aquarium will self maintain.
J_Fish
2025-08-26 09:35:47
Holds vacuum at a steady level but sometimes at certain levels of flow it will make a whistling sound. Simply turning it in one direction and then back usually stops the sound.
Nina
2025-08-17 13:34:12
I run a commercial grade vacuum pump and this is my regulator essentially- works awesome. Great adjust ability.
Steve
2025-08-06 13:37:12
I have an application with an electronic variable vacuum adjustment. I wanted something to use as a "fail safe" so that if the electronic regulator failed, it would still not pull more than a specified level of vacuum to avoid damage to the system. This gizmo fits the bill perfect. I was able to set it to just above the maximum vacuum the regulator is supposed to allow. If the regulator doesn't do it's job for whatever reason, the valve opens and prevents over (vacuum) pressurizing.Setting the pressure can be a bit fiddly, but as long as you don't need to be super precise it's easy enough to get it adjusted.
Alec Fisher
2025-07-17 15:56:43
Just what I needed to regulate the level of vacuum. Would be nice if it had some sort of graduations on it (perhaps with similar markings as micrometers have) to indicate actual levels of vacuum, but it works well.
Charles R. Pafford
2025-06-25 10:37:17
It's hard to find good Schrader valves with weak enough springs for water well service. These vacuum breakers are adjustable.
defaultname
2025-06-15 16:16:56
This piece was used to control the pressure of a vacuum system in the lab. It screws out quite a bit and the pressure varies almost linearly with the number of times turned.
V. Williams
2025-06-05 16:48:43
This device seems well made and durable, but if you are intending to attach it to a beverage line or passing liquid near it that is intended for consumption, think twice. Having read about various factories mixing lead in their brass, I decided to buy a reliable lead testing kit and tested all my recent brass connector purchases. Six out of 20 items tested positive for lead content. This item was one with lead in it.
J. Hamilton
2025-04-14 15:39:54
I am using this with a yeast system that includes a silonide and regulator. This is used to prevent to much pressure developing in the yeast bottle. It functions perfectly. This system is far easier to adjust then any pressurized CO2 system. Along with the fishmate feeder I can take off for a couple of weeks vacation an be confident that my aquarium will self maintain.
J_Fish
2025-04-09 17:13:47
Holds vacuum at a steady level but sometimes at certain levels of flow it will make a whistling sound. Simply turning it in one direction and then back usually stops the sound.
Nina
2025-04-02 11:05:49
I run a commercial grade vacuum pump and this is my regulator essentially- works awesome. Great adjust ability.
Steve
2025-03-15 17:38:05
I have an application with an electronic variable vacuum adjustment. I wanted something to use as a "fail safe" so that if the electronic regulator failed, it would still not pull more than a specified level of vacuum to avoid damage to the system. This gizmo fits the bill perfect. I was able to set it to just above the maximum vacuum the regulator is supposed to allow. If the regulator doesn't do it's job for whatever reason, the valve opens and prevents over (vacuum) pressurizing.Setting the pressure can be a bit fiddly, but as long as you don't need to be super precise it's easy enough to get it adjusted.
Alec Fisher
2025-03-10 15:20:17
Just what I needed to regulate the level of vacuum. Would be nice if it had some sort of graduations on it (perhaps with similar markings as micrometers have) to indicate actual levels of vacuum, but it works well.
Charles R. Pafford
2025-01-25 11:56:13
It's hard to find good Schrader valves with weak enough springs for water well service. These vacuum breakers are adjustable.
defaultname
2025-01-03 13:41:10
This piece was used to control the pressure of a vacuum system in the lab. It screws out quite a bit and the pressure varies almost linearly with the number of times turned.
V. Williams
2024-11-18 13:38:48
This device seems well made and durable, but if you are intending to attach it to a beverage line or passing liquid near it that is intended for consumption, think twice. Having read about various factories mixing lead in their brass, I decided to buy a reliable lead testing kit and tested all my recent brass connector purchases. Six out of 20 items tested positive for lead content. This item was one with lead in it.
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