Phone (602) 253-1007 Page 69 Fax (800) 222-2334

AIR SYSTEM PIPING DIAGRAMS Pre-121 Trailer Air Systems

Tandem Axle Traile r (Pre FMVSS 121)

Tandem Axle Trailer with Spring Brakes (Pre FMVSS 121)

Phone (602) 253-1007 Page 70 Fax (800) 222-2334

AIR SYSTEM PIPING DIAGRAMS 121 Trailer Air Systems

Tandem Axle Trailer (2 Tanks / 3 Valves)

Tandem Axle Trailer (3 Tanks / 3 Valves)

Phone (602) 253-1007 Page 71 Fax (800) 222-2334

AIR SYSTEM PIPING DIAGRAMS 121 Trailer Air Systems

Tandem Axle Trailer (Spring Brake Priority 110500 or 110800 / Service Reservoir Priority 110700)

Tandem Axle Trailer (Protected Reservoir System)

Phone (602) 253-1007 Page 72 Fax (800) 222-2334

AIR SYSTEM PIPING DIAGRAMS 121 Trailer Air Systems

Single Axle Trailer (Double) (Spring Brake Priority 110500 or 110800 / Service Reservoir Priority 110700)

Single Axle Trailer (Double) (Protected Reservoir System)

Phone (602) 253-1007 Page 73 Fax (800) 222-2334

AIR SYSTEM PIPING DIAGRAMS Converter Dolly Air Systems

Single Axle Dolly Charging System

Single Axle Dolly Non-Charging System

Phone (602) 253-1007 Page 74 Fax (800) 222-2334

AIR SYSTEM PIPING DIAGRAMS 121 Trailer Air Systems

Tri Axle Trailer – ABS Exempt (2 Tanks / 3 Valves)

Tri Axle Trailer – ABS Exempt (2 Tanks / 2 Valves)

Phone (602) 253-1007 Page 75 Fax (800) 222-2334

AIR SYSTEM PIPING DIAGRAMS 5 Port / 2 Way Valve – Manual

Lift Axle Trailer Application

Box Locking System – Transfer Trailer

Phone (602) 253-1007 Page 76 Fax (800) 222-2334

AIR SYSTEM PIPING DIAGRAMS Fast Fill Air Suspension Valve

Bracket Mounted 110595

Tank / Nipple Mounted 110597

Phone (602) 253-1007 Page 77 Fax (800) 222-2334

AIR SYSTEM PIPING DIAGRAMS Conversion – Bendix SR-5 to Sealco 110800

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AIR SYSTEM PIPING DIAGRAMS Conversion – Sealco 110147 to Sealco 110170

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Phone (602) 253-1007 Page 79 Fax (800) 222-2334

TERMINOLOGY – Air System Anti-Compounding – An option that prevents the simultaneous application of the service brakes and emergency or parking brakes offered by some air brake system manufacturers in their spring brake control valves. This option guards against over-torque of the foundation brakes causing such problems as bent chamber push rods, broken camshafts, cracked drums, lining damage, damaged chamber brackets, etc. Application Time – Elapsed time between the depression of the brake treadle and the delivery of 60 psi to all of the service chambers per FMVSS 121. Charging System – An air system where the reservoir(s) is filled through a relay emergency valve (REV), not through a pressure protection valve (PPV). When the supply line is "charged" with air, the air enters the port marked "Emerg-Supply" of the REV through a one-way check valve (an integral part of the REV) and into the reservoir(s) via the reservoir port of the REV. Control or Service Line – The air lines in the trailer air brake system that perform the normal braking of the vehicle from the tractor foot valve or hand valve. Control or service lines are commonly associated with the blue air line function of the air system. Control is a post FMVSS 121 term and service is a pre FMVSS 121 term. Cracking Pressure – The minimum amount of air pressure (in psi) required to open an air valve. Protected Reservoir System – A spring brake control valve (SBCV) option using integral one-way check valves for two reservoir systems that assures the loss of one reservoir will “protect” the other reservoir. Allows for the release of the parking brakes at least once after they have been applied due to the catastrophic loss of air pressure in one of the reservoirs. Simultaneously charges the reservoirs and releases the parking brakes when starting with 0 psi in the trailer air brake system. Non-Charging System – An air system where the reservoir(s) is filled through a pressure protection valve (PPV), not the relay emergency valve (REV). When the supply li ne is “charged” with air, the reservoir(s) receives air. The purpose of the PPV is to close off and retain (protect) 70 psi in the supply line in the event of a catastrophic loss of reservoir air pressure while the vehicle is being towed. This prevents the spring brakes from applying or dragging on the axles with spring brake chambers in the combination vehicle. Release Time – Elapsed time required to reduce the pressure in all service chambers from 95 psi to 5 psi per FMVSS 121.

Service Reservoir Priority – A spring brake control valve (SBCV) option where priority is given to directing supply air to fill the reservoir(s) instead of releasing the spring brakes, even though both are building pressure simultaneously. This priority pr events releasing the parking brakes after they have been applied due to a catastrophic loss of air in the reservoir(s). Spring Brake Priority – A spring brake control valve (SBCV) option where priority is given to releasing the parking brakes instead of filling the reservoir(s). When supply line is charged with air with 0 psi in the reservoir(s), it is sent directly to the parking brakes. As the supply line pressure exceeds 80 psi, the pressure protection valve (PPV) in the SBCV opens and fills the reservoir. This priority allows for the release of the parking brakes after they have been applied due to a catastrophic loss of air pressure in the reservoir(s). Supply or Emergency Line – The air lines in the trailer air brake system that charge the trailer air reservoir(s) and apply and release the parking or emergency brakes using the trailer push-pull valve in the tractor. Supply or emergency lines are commonly associated with the red air line function of the air system. Supply is a post FMVSS 121 term and emergency is a pre-FMVSS 121 term.

Phone (602) 253-1007 Page 80 Fax (800) 222-2334

TERMINOLOGY – Valve Types

Air Bag Control Valve – Controls the inflation and deflation of trailer air suspension bags. In a manual valve, it requires manual operation to deflate or re-inflate the air bags allowing for movement of the trailer back to the dock without re-inflating the air bags. In an automatic valve, the air bags are deflated manually but are automatically re-inflated when the trailer parking brakes are released.

Check Valve (CV) – One-way check valves allow air to flow in only one direction, often protecting the air supply in a reservoir. Two-way check valves have two inlets and one outlet allowing airflow from the highest pressure input only thereby blocking airflow from the lower pressure inlet.

Control Line Valve (CLV) – A low or zero crack pressure relay valve used to speed up the control line signal. Commonly used on trailers designed to tow another trailer and long whee lbase sliding tandem non-towing t rai lers. The CLV fills the downstream control line faster on application and exhausts the air from the downstream control line faster on release. The CLV is used to meet FMVSS 121 brake application and release timing requirements and achieve uniform brake balance in the multi-axle combination vehicle.

Dolly Control Line Valve (DCLV) – Similar to a standard control line valve with the addition of a port marked "Dolly Port" which applies and releases the control line signal of air to the relay valve on the steerable axle. The unmarked delivery port of the DCLV applies and releases the control line signal of air to the downstream service relay valves. Commonly used on converter dollies and turntable axles on pull, transfer and train-type trailers.

Emergency Control Valve – Fills the reservoir(s) with air and takes the service chambers in and out of emergency working with a SRV or ABS relay valve. Commonly used on converter dollies, turnable axles and trailers exempt from spring brakes.

Line Filter – Reduces the amount of supply line contamination when used in the trailer supply line ahead of the SBCV or REV thereby extending the useful life of other air valves in the system.

Pressure Protection Valve (PPV) – Protects upstream air source in the event of a downstream failure. Closes to retain the supply line pressure above a specified setting, usually 70 psi, in the event of a single source failure such as a reservoir. Often built into a spring brake control valve (SBCV).

Quick Release Valve (QRV) – Provides high capacity exhaust flow capabilities and is usually mounted near the device being exhausted. Commonly used for brake chambers and suspension air bags.

Relay Emergency Valve (REV) – Charges the reservoir(s) with air, applies & releases the normal service brakes and applies & releases emergency brakes. Used with service chambers only on converter dollies, trailer turntable axles, liftable axles, pre FMVSS 121 trailers or trailers exempt from spring brakes under FMVSS 121.

Service Relay Valve (SRV) – Relays air from the reservoir to the brake chambers performing the normal braking function upon receiving a signal from the foot valve, hand valve or control line valve (CLV). Used on post FMVSS 121 trailers with spring brake chambers.

Spring Brake Control Valve (SBCV) – Charges the trailer reservoir(s) with air, applies & releases the parking brakes and applies the emergency brakes if a catastrophic loss of supply line pressure occurs. Determines the priority of air delivery when supply line air is applied based upon the design of the SBCV (see Protected Reservoir System, Spring Brake Priority & Service Reservoir Priority on preceding page). Used on post FMVSS 121 trailers with spring brake chambers, SBCVs combine a quick release valve (QRV), pressure protection valve (PPV) and, in all Sealco SBCVs, a one-way check valve (CV) for anti-compounding. The SBCV is operated by the trailer push-pull valve in the tractor.