#Stuffing box assembly drawing pdf book how to

It requires sliding the gland over the shaft, tightening the gland bolts, using an allen wrench to tighten the set screws to the pump shaft, and removing the setting clips. 50% of seal failures are caused by Cartridge seals are by far the easiest seal to install. The cartridge seal cannot be miss installed. The purpose of the setting clips is make sure the seal faces are locked into position on the shaft that provides enough force to maintain a seal, but not too much force that would cause premature wear.

3) The hardware that connects Mechanical Seals into a single rotary piece which has the following hardware gland rings, lock collars, compression rings, set screws, pins, springs, retaining rings/clips and bellows.Ĭartridge Seals are more complicated and include a sleeve and gland.Ĭartridge seals are by far the easiest seal to install.

2) Secondary seals - Which includes Gaskets, o-rings, rubber bellows, PTFE or Flexible Graphite wedge or V-Rings.

1) Seal faces: one that rotates with the pump shaft and one that remains stationary.

Mechanical seals utilize 3 component parts: Single spring seals resists clogging and are commonly used in waste water applications. and should be considered prior ro ordering the seal. Misalignment, shaft deflection, and break away shock loading can all damage a mechanical seal. The rule of thumb is a mechanical seal should have no more than. While some Mechanical seals designs provide for added flexibility to accommodate shaft run out. The purpose it to prevent unwinding of the spring since pumps can be designed to turn left or right. Single spring mechanical seals have the springs coiled in a right of left hand design. Special mechanical seals can be furnished to meet the most demanding of industrial applications considering pressure, temperature, speed or fluid. Balanced seals can seal pressures above 200 psi, or used in a multiple stages for higher pressures or especially severe fluid services. Seal faces can be balanced to permit higher pressure sealing. Seal face combinations will also determine the amount of energy consumed by the pump, mixer, agitator or compressor. The combination of materials used in the rotating and stationary faces define the abrasive resistance, and chemical resistance. The selection of secondary seal type often determines the temperature and chemical capabilities of the seal. Standard mechanical seals can suit most requirements to temperatures of 500 degrees F and shaft speeds to 3600 RPM. The basic rotating face mechanical seal design is adaptable to serve a wide range of sealing applications including compressors. In others seals must be designed for evolving industrial demands. In many cases the designs have been proven to be workhorses over years of use.

Mechanical seals are engineered for most pumps, mixer and agitator applications in maintenance. The choice of what is the best depends on the temperature, and nature of what is being sealed (viscosity, abrasiveness, weight (is it a slurry?)).

The load the seal faces receive are engineered into the design of the seal. Springs (single or multiple), a metal bellows or just compressed elastomers are used to provide the needed energy to keep pressing the seal faces together.

#Stuffing box assembly drawing pdf book how to

The other key aspect of a mechanical pump seal is how to maintain the seal. Every other leak path within the mechanical seal is blocked with the use off a gasket, o-ring, wedge (Rubber, PTFE or Flexible Graphite).