Grohe Safe 35-250-000 Pressure Valve installation question

Discussion in 'Shower & Bathtub Forum & Blog' started by FlynHokie, Apr 27, 2009.

  1. FlynHokie

    FlynHokie New Member

    Jan 25, 2009
    Williamsburg, VA
    Good evening everyone.

    I'm back from a long trip for work, and can get back to remodeling my master bathroom. So far, I have all parts sitting in the garage for installation (Americh showerbase, Shower & Floor tile, grohe safe valve, grohe shower handle/head, Toto toilet, ronbow cabinet & sink, faucet, exhaust fan, etc..). I have the bathroom gutted, subfloor repaired and hardibacker installed.

    The old shower valve that I took off, which was in bad shape, was screwed into a horizontal 2x4 that was mounted between two studs in the shower frame. The new valve I have, a Grohesafe 35-250-000 Pressure Balance Rough in valve, will not fit against the 2x4. Fine, I'll rip the 2x4 out.

    The question is - how to I mount the valve to something solid, so it isn't just sitting on a hot & cold pipe? Shouldn't it be mounted to the shower frame somehow? The instructions do not show how to install it, nor can I find any installation pictures of similar models anywhere. Do you have any advice?

    Attached Files:

  2. FlynHokie

    FlynHokie New Member

    Jan 25, 2009
    Williamsburg, VA
    more questions

    Also -

    When connecting the hot/cold inlets, and the shower output, how do you connect the threaded pipes? Do you turn them to a certain torque? Do you hand tighten? Do you sweat them to the 1/2" copper pipe?

  3. Sponsor

    Sponsor Paid Advertisement

  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    Pipe threads are tapered and won't make a seal by themselves; you need to use either pipe dope or teflon tape. You can use both, sort of a belt and suspenders mentality - tape then dope. The quality of the fitting will make a difference in how easy it is to thread the thing into the female. You need to get it's something you get a feel for. Because the fitting is tapered, if you overtighten it, you could split the valve, but it takes a LOT of torque to do that normally. Hand tight will leak.

    What I'd do (note, I'm not a pro), is solder at least a 6" piece of pipe into the adapter, then using tape with pipe dope on top, tighten the pipe stub and adapter into the valve. This will give you a section of pipe that will act like a radiator when you install the rest of the connections - you can put a damp rag on the piece to keep heat from the valve, just not on the fitting you are trying to solder.

    Then, I'd use some copper clamps to hold the pipe sections to something you put in there for a brace. You could use a drop-ear el, if you can arrange it...those have ears you can put screws into rather than use clamps.

    Just make sure you understand the min/max when anchoring the valve so the trim fits with the wall covering you are planning.
Similar Threads: Grohe Safe
Forum Title Date
Shower & Bathtub Forum & Blog Grohe Grohsafe 35015 Universal Pressure Balance Rough - In Valve Oct 30, 2011
Shower & Bathtub Forum & Blog Grohe Grohsafe Pressure Balance Valve Feb 5, 2009
Shower & Bathtub Forum & Blog Grohesafe 35 253 Valve Install Jun 1, 2006
Shower & Bathtub Forum & Blog new Grohe Eurocube shower faucet hard to turn Sep 12, 2017
Shower & Bathtub Forum & Blog How to remove 1988 Grohe Shower Handle Trim "Cap" Aug 30, 2017

Share This Page