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Most of the valves and pressure regulators are based upon the sliding, metal-to-metal, ceramic-to-metel shear-type seal. This type of seal is known for its durability and for its capability to operate with high reliability even with fluids which are highly contaminated by particulates. The sliding action rubs away the contaminants and actually improves the seal with a polishing action between the seal rings and seal plates of the valve.

The earliest valves had carbon steel bodies and flanges which were coated with special, baked-on finishes. The valve trim, parts, the seal rings and seal plates were stainless steel.

However, it was soon realized that stainless steel structural parts were, in the long run, more cost-effective and reliable.

All Cameron valves and pressure regulators for offshore system installations are now manufactured completely from stainless steel or other appropriate corrosion resistant materials.

The standard material for valve bodies and flanges is 303 stain-less steel; type 316 stainstain-less steel is available on special order.

The seal plates of most 1/4" valves for installation in the subsea

environment are alumina ceramic (aluminum oxide); all other valves have type 440C stainless steel seal plates. The ceramic seal plates result in valves which have an almost unlimited life.

The seal rings are 17-4PH stainless steel. Aluminum bronze or

contact with 300 series stainless parts to prevent galling.

Springs in the valves are typically 17-7PH stainless steel. All fasteners (cap screws, bolts, nuts, retaining rings, etc.) are stainless steel. The magnetic circuit components of solenoid valves employ carbon steel which has been electroless nickel plated and all parts which would otherwise be exposed to sea water are enclosed within a stainless steel outer housing.

1/4" Solenoid Valves

The 1/4", two-position solenoid valves are available in either three-way or four-way configurations. The valves have direct-acting coils and use shear-type seals. They are available with 24-28 VDC or 110-120 VDC coils. The valves have a Cv of 1.1.

These valves are available either for total sea water immersion or for mounting onto pressure compensated, oil-filled chambers which isolate the coils from exposure to sea water.

1/8" Solenoid Valves

The 1/8", three-way solenoid valves have a small orifice and are designed to serve as pilot valves for larger valves of all sizes, from 1/4" up to 1-1/2". They have direct-acting coils and use shear type seals. The solenoid housings are designed for mounting to a pressure compensated, oil-filled junction box.

They are available with 24-28 VDC or 110-120 VDC coils and may have single or dual coils. The valves have a Cv of 0.05.

1/8" Three-Way, Solenoid Valve

1/8" Three-Way, Solenoid Valve Detail (1/4" valves are similar in construction)

SD-8689

SD016228

ruggedness and reliability. The basic valve design was developed for use in the earliest subsea drilling control systems.

tered by springs and the hydraulic pressure supply. The valve Cv is 0.8. Pilot cylinder purge fittings are a standard part of the valve. Valves are available for either captured exhaust or for exhausting fluid to sea.

1" Four-Way Valves

The 1" four-way, three-position valve is mounted onto seal subs for all hydraulic connections, including the pilot ports. It is centered by both springs and the hydraulic pressure supply.

The Cv of the valve is 9.0. Pilot cylinder purge fittings are a standard feature of the valve.

function. The valves may also be push rod actuated with spring return. These valves are ideal for emergency functions which require conservation of hydraulic fluid because no fluid is ever lost during the valve shift.

1" Three-Way Valves

The 1" three-way valves are hydraulically piloted with spring return assisted by the hydraulic pressure supply. The valves are available in normally open and normally closed configurations.

The slide of the valve is stainless with ceramic coating for corro-sion protection and durability.

1/4" Four-Way, Three-Position, Subsea Valve 1/4" Three-Way, Hydraulically Piloted, Non-Interflow Valve

1" Three-Way, Hydraulically Piloted Valve 1" Four-Way, Three-Position, Subsea Valve

SD-5403

SD-5083 SD016225

SD016224

with a purge fitting. The valve is hydraulically piloted open and closed and is also fitted with a fail-safe closing spring.

The Cv of the valve is 30, making it capable of closing a large annular preventer very rapidly.

1-1/2” Pressure Regulator

The 1-1/2" hydraulic pressure regulator is sized to supply the 1-1/2" three-way valve shown above. The regulator has a pressure rating of 5000 psig and a Cv of 30. It is mounted onto seal subs so that it is easily removable for service. It has a purge fitting on its pilot cylinder. The exhaust seal plates of this regulator are alumina ceramic. The pilot/outlet pressure ratio is 1:1.

sizes. The valve seats are metal-to-metal with elastomeric backups. The 1" valve has a Cv of 21, and the 1-1/2" valve a Cv of 35.

Positive Shuttle Valves

Positive shuttle valves are available in 1/4" and 1/2" sizes. The positive shuttle valve ensures that a positive valve shift occurs without any loss of fluid; it is a non-interflow valve; this is impor-tant in the control of emergency functions. Unbalanced cylin-der versions are specified when pressure may be applied simulta-neously from both supply ports. In this situation a positive shift of the valve is assured by the larger of the two actuating pistons.

1-1/2" Three-Way Valve 1" Shuttle Valve

1/2" Unbalanced, Positive Shuttle Valve