Applications: FHK Series sockets incorporate valves in both socket and plug halves to prevent fluid
loss when the socket is disconnected. These sockets are normally referred to as "hydraulic couplings",
but they are used extensively with other media where objectionable. The FHK Series sockets are available in ROHS
compliant steel and brass.
Vacuum Service: 27" Hg. maximum Rated pressures as defined by ANSI/B93.2-1986 based on 4:1 Safety Factor and non-shock service.
Type: FHK, Two-Way Shutoff , Both socket and plug are sealed at disconnect.
Interchangeability: Standard, most widely used, industrial interchange design. Within each series, only sockets and plugs of the same size will couple to gether. Compatible with ISO 7241-1, Series B.
Operation: Manual - Socket sleeve must be manually retracted to connect and disconnect.
Seal Compound: Standard seals are Buna-N.
One Way Shut-Off: Add suffix VA to either socket or plug catalog number for valve actuator.
Straight-Thru: Add suffix LV to both socket and plug catalog number for less valve.
BL: Locks against accidental disconnect. To connect, align ball with slot. After connection, rotate sleeve to lock. To disconnect, realign ball with slot and retract sleeve. To order, add prefix BL to socket catalog number.
Ordering information: FHK Series couplings are available in ROHS compliant plated steel, brass, and
303 Stainless as standard. Brass couplings have double O-Ring seals (excluding 1/8>") and stainless locking balls.
ISO B, Hardened plugs and sleeves constructed from solid bar stock ensures long service life and maximum resistance to damage
from hydraulic and mechanical shock.
High flow capacity.
Foster's conical valve with its 360° metal to metal valve stop maintains valve alignment and insures that poppets open fully every time.
Captive valve seal ensures "bubble tight" poppet sealing since seal is positively captured by the metal poppet to minimize seal washout or damage from high fluid velocity.
Ball locking mechanism ensures reliable connections every time. Many ball bearings distribute the load while providing alignment and excellent swiveling action to reduce hose torque and prolong hose life.
Broad range of metals and seal materials allow the use of most fluids.
Dust Plugs and Dust Caps
Protective dust plugs and caps play a crucial role in the use of quick couplings and no
purchase of a hydraulic quick coupling is complete without the selection of an appropriate dust plug and cap.
Dust plugs and caps serve a two-fold function. They keep the mating surface clean and free of contamination
and protect the critical mating elements of the coupling halves when they are disconnected.
In this way the plug is protected from damage that would make the total coupling unusable.
When ordering the dust cap/plug body size must correspond to that of the socket or plug.
Foster Manufacturing • 2324 W. Battlefield Rd. • Springfield, MO 65807
Ph: 417-881-6600 • Toll Free: 866-918-3003 • Fax: 417-881-3645