Spears Swing Check Instrucciones De Instalación

PVC Utility & True Union
SWING & SPRING CHECK VALVES
Installation Instructions
and maintained in accordance with accepted standards and procedures for
plastic piping systems. It is absolutely necessary that all design, installation,
operation and maintenance personnel be trained in proper handling, installation
requirements and precautions for installation and use of plastic piping systems
before starting.
Swing Check & Spring Check Valves are designed for horizontal installations,
but may be installed in up-fl ow only vertical applications.
Check valves must be installed with the valve fl ow arrows pointing in the
direction of fl ow. Do not install upside down. A minimum of 10 pipe diameters
should be maintained from any pump or turbulent source.
GENERAL INSTALLATION INSTRUCTIONS
Prepare connecting pipe as required for solvent cement or thread
STEP 1
connections.
Support valve body to hold its weight. Make sure valve is positioned
STEP 2
as indicated "This Side Up" with proper flow direction. Attach one end connector of
valve according to Solvent Cementing or Threading Procedures on the following
pages.
Repeat Step 1 to attach opposite end connector of valve to pipe,
STEP 3
making sure valve is aligned with pipe.
Pressure test system only after all solvent cement joints have fully
STEP 4
cured. Flanged connections may require additional tightening after initial pressure
testing.
True Union Valve Assembly
Socket/Thread Valve Body
USCV-3A-0605
Read all applicable instructions and
procedures thoroughly before starting.
Suitability of the intended service
application must be determined prior
to installation. Please review "Material
Considerations in Application and
System Design", in the Materials section
of Spears ' THERMOPLASTIC VALVE
®
PRODUCT GUIDE & ENGINEERING
SPECIFICATIONS, V-4, for important
additional considerations related to valve
installations. Plastic piping systems
must be engineered, installed, operated
1
SOLVENT CEMENT WELDED JOINTS
For best results, installation must be made at temperatures between 40°F and
110°F. All joint components must be inspected for any breaking, chipping,
gouging or other visible damage before proceeding. All pipe, fi ttings and
valves must be removed from their packaging or containers and exposed to
the installation environment for a minimum of one hour in order to thermally
balance all components. All joining components must be clean and dry.
TAKE EXTRA CARE THAT NO PRIMER OR SOLVENT CEMENT IS ALLOWED
TO COME IN CONTACT WITH INTERNAL VALVE COMPONENTS.
Pipe Preparation
- Prepare connecting pipes as required. Pipe ends
STEP 1
must be cut square at 90° using a wheel type cutter or a saw and miter box. Regardless
of the cutting method used, burrs will be created, which must be removed. All pipe ends
should be beveled at 10° to 15°. A deburring tool is recommended, however a file may be
used in its place as shown.
90°
90°
Clean Joint Components
STEP 2
the pipe O.D. and fitting I.D. with a clean, dry cotton cloth. DO NOT ATTEMPT TO JOIN
WET SURFACES.
Check Dry Joint Interference Fit
STEP 3
valve socket is necessary for proper fusion of the joint. To check, lightly insert pipe into
fitting socket. DO NOT FORCE. Interference between pipe and valve must occur between
½ of the socket depth (full interference fit) and the socket bottom (net fit). Do not use
components which improperly mate.
NET FIT
Socket Depth
Apply Primer
- Primer is necessary to penetrate and soften both
STEP 4
pipe and valve socket surfaces in order for the solvent cement to properly bond. THE
MOST FREQUENT CAUSE OF JOINT FAILURES ARE INADEQUATE SOLVENT
PENETRATION & SOFTENING OF BONDING SURFACES DURING THE WELDING
OPERATION.
1. Using a brush or applicator size
no less than ½ the pipe diameter,
apply a liberal coat of primer
with a scrubbing motion to the
valve socket until the surface is
softened and semi-fl uid. This may take 5 to 15 seconds depending on size and
temperature (larger diameters and lower temperatures will increase required time).
2. Apply primer to pipe in the same manner, extending application area to slightly more
than the insertion depth into the valve socket.
3. Apply a second coat to both the valve socket and
the pipe.
4. Check penetration and softening by scraping the
primed surfaces. A few thousandths of the semi-
fl uid surface must be easily removed. Repeat primer
application if necessary.
Deburr & Bevel
- Wipe away all loose dirt and moisture from
- An interference between pipe and
½
Socket
FULL INTERFER
Depth
Socket Depth
2