The actuator controls the opening of the dry pipe valve, the accelerator speeds up the process of dumping air to get to the trip point.
The actuator also releases air but in a different way than the accelerator does. Jeff Brickell, CET Senior Estimator/Designer NICET III CERTIFIED CERT #147245 OREGON CERTIFIED COBID FIRM #13272 (EMERGING SMALL BUSINESS) TRIAD FIRE PROTECTION [cid:image001.jpg@01DB8376.427A6A20] OREGON . WASHINGTON . ARIZONA OFFICE 503.856.6333 CELL 602.550.4292 FAX 866.766.8862 From: Mike Watts <mwa...@firetrol.net> Sent: Thursday, February 20, 2025 8:48 AM To: Discussion list on issues relating to automatic fire sprinklers <sprinklerforum@lists.firesprinkler.org> Subject: [Sprinklerforum] Re: Dry valve actuator A lot of times You will find an accelerator valved out and that is totally wrong. The accelerator is there because the system volume. The time it takes to get the water to the outlet in the event of a fire. The accelerator is looking for a 3psi drop in pressure, and it will activate the the system, making a trip faster. Most of them put air pressure on the intermediate chamber, which changes the surface area ratio of the valve and makes the valve open to get water to the fire within the amount of time for the hazard of the area. Most of the time, the accelerator is not the problem. It is something to do with the air supply. Lots of techs are afraid of them because they don't understand them, so they just leave them off. If I recall right nfpa states, they should be monitored i totally agree with monitoring them. Mike Watts Sprinkler Service Manager Firetrol Protection Systems 4616 W. Howard Lane, Suite 700 Austin, TX. 78728 512-687-0115 Office 512‐660-4411 Cell mwa...@firetrol.net<mailto:mwa...@firetrol.net> ________________________________ From: Mike Watts <mwa...@firetrol.net<mailto:mwa...@firetrol.net>> Sent: Thursday, February 20, 2025 9:42:59 AM To: Discussion list on issues relating to automatic fire sprinklers <sprinklerforum@lists.firesprinkler.org<mailto:sprinklerforum@lists.firesprinkler.org>> Subject: Re: [Sprinklerforum] Dry valve actuator Are you talking about an accelerator? Mike Watts Sprinkler Service Manager Firetrol Protection Systems 4616 W. Howard Lane, Suite 700 Austin, TX. 78728 512-687-0115 Office 512‐660-4411 Cell mwa...@firetrol.net<mailto:mwa...@firetrol.net> ________________________________ From: Andre smilz <ahurdu...@gmail.com<mailto:ahurdu...@gmail.com>> Sent: Thursday, February 20, 2025 9:04:20 AM To: sprinklerforum@lists.firesprinkler.org<mailto:sprinklerforum@lists.firesprinkler.org> <sprinklerforum@lists.firesprinkler.org<mailto:sprinklerforum@lists.firesprinkler.org>> Subject: [Sprinklerforum] Dry valve actuator What is the purpose of an actuator on a dry valve I've come across so many out of service are they really that difficult to clean out and put back in service? Having a hard time finding info on how to clean them out and put back in service. What is the purpose of an actuator on a dry valve I've come across so many out of service are they really that difficult to clean out and put back in service? Having a hard time finding info on how to clean them out and put back in service.
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