Quality Gauge & Valve Quality Series Q156

 The Quality Series Q156 uses an offset union bonnet pattern with a renewable seat. This type of valve can also be used as a quick closing valve and offers back seating to protect the packing. Another important feature is the renewable seat, which allows the user to replace fresh seating for this valve.


Quality Gauge & Valve Quality Series Q156

The simplest and least costly method of liquid level indication is the tubular gage glass. Quality has a variety of designs are available. All series use transparent vertical tubes with their lowest visible point connected to the tank or boiler at the lowest level of required. The top of the glass may be open to the atmosphere if the tank is open or to the unfilled part of a closed vessel above or at the highest level permitted. Isolating valves are placed above and below the gage glass connections.

Quality has slow closing valves and also valves with quick closing connections, where a one quarter turn of the valve spindle will allow the valve to change from the fully open to the fully closed position. Quality uses different valve spindles that are fitted with levers which allow chains to be attached in order to operate the valves from ground level. Quality drain valves or cocks may also be installed below the gauge glass for flushing to remove any solid material that may be collected.

Due to the constant supervision needed for many tanks and pressurized vessels, a broken tubular gauge glass can cause excessive amounts of liquids to escape. To prevent such occurrences, Quality equips the lower Tubular Valve with a protection shutoff. This device is the stainless steel ball which closes off fluid channel when the tubular glass is broken. When the tubular glass breaks, the unexpected rush of liquid through the valve will force the ball against the valve opening. With this type of safety shutoff the valve often requires more maintenance.  Another type of protection supplied by Quality is the Metal Shield. This device uses metal rods or shield to protect the tubular glass from breaking, it also protects the operator from debris should breakage occur.

The applications of tubular gauge glass are limited to lower pressure and temperatures. Many of the applications which are non-toxic and non-hazardous materials are used for this type of valve system. For tubular glass gauges exceeding 700 mm in length, Quality suggests using more valves to contain the operation.

Important dimensions

  • Visible glass : centre to centre minus 5-5/8”
  • Tubular glass length: centre to centre minus 2-3/8”
  • Guard Rods Length: centre to centre minus 2-3/8”


  • 3/4 inch or ½ inch, or flanged, union or non-union connections
  • ¾ inch or ½ inch drain connections
  • ¾” inch tubular glass
  • Glass gland is designed to prevent torque on the tube.
  • Ball check automatically stops flow in the event of tube breakage
  • Four guard rods with a holder to protect glass. (available in plastic and steel)
  • Offset body pattern to allow cleaning of tube by drain plug removal.
  • Renewable seating
  • Stainless steel trim
  • Sleeve construction allows both quick closing and back seating to protect packing

Reference : qualitygauge.com