Page 413 - 4300 Catalog Cover.pdf

4300 Catalog Assembly / Installation
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
T3
Port End Assembly
The three common types of port ends used in the United States
with tube fittings, pipe fittings and hose fittings are:
1) Parallel thread
2) Tapered Thread
3) Flanges
Parallel Thread Ports
Unlike tapered threads, parallel threadportsdonot requiresealing
by the threads. The seal is obtained by other means, typically
an elastomeric seal. When assembled properly, parallel thread
ports provide the best leak-free port connection available.
Parker tube fittings are available with several types of parallel
thread port studs (ends):
• SAE straight threads (SAE J1926 / ISO 11926)
• ISO (ISO 6149)
• JIS (JIS B2351)
• BSPP flat face (ISO 1179)
• DIN Metric flat face (ISO 9974).
The SAE straight thread, ISO 6149 and JIS B2351 ports are
all of similar design. The male end is fitted with an O-ring. On
assembly, the O-ring is firmly sandwiched between the angular
sealing surface of the female port, the male end undercut, and
the shoulder or back-up washer of the male end. Sealing is thus
madepossibleandmaintainedby theO-ring compression, which
results from the sandwiching of the O-ring in the cavity as shown
in Fig. T1. The straight threads do not offer sealing action; they
provide the resistance (holding power) for service pressure.Port
dimensions for SAE and ISO 6149 ports are given on pages
U25 and U26 respectively. For JIS B2351 dimensions, please
contact the Tube Fittings Division.
Fig. T1 – SAE / ISO / JIS B2351 Straight Thread Port O-Ring
Upon Assembly
The SAE straight thread port is the same as MS 16142. It is
also similar to,but dimensionally not the same as,MS33649
and AND 10050, and thus not interchangeable with them.
Therefore, it is not recommended touse fittings designed for SAE
straight thread ports in MS 33649 and AND 10050 ports.
With the BSPP and metric flat face port ends, the sealing actu-
ally takes place on the top surface (spot face) of the port. Port
dimensions can be found on pages U29 and U30 respectively.
There are several sealing methods available for these ports.
Port studs with type “E” sealing utilize Parker’s EOlastic seal
(ED) (see Fig. T2) and are recommended for higher pressures
than the other types. Types “G” and “H” use an O-ring that is
supported on the outside by a removable retaining ring (see Fig.
T3).TypeB (cutting face) is designedwith a relatively sharp ridge
of material that seals by coining the flat face of the female port
(see Fig.T4). Afourth sealing method uses a bonded seal which
consists of a metal ring with an elastomer bonded to the inside
surface (often referred to as Dowty® seal) (se e Fig. T5).
Fig. T2 – EOlastic Seal, Type E
Fig. T3 – O-Ring with Retaining Ring, Types G & H
Fig. T4 – Cutting Face, Type B
Fig. T5 – Bonded Seal
Port End Assembly