Power Cylinder Operated Valve

BV2X

The Model BV2X Power Cylinder Operated Valve is designed to be used where minimum pressure drop is required or applications where it is not practical to use the fl owing stream as the power medium to operate a valve. Because the main piston is controlled externally, and by reason of the 45° body design, pressure drop through these valves is extremely low.

Standard power cylinders are designed to operate on 30 psi (207 kPa) minimum for full stroke and are limited to a maximum pressure of 150 psi (1034 kPa).

The power cylinder may be operated either pneumatically or hydraulically with electric, pneumatic, or hydraulic pilot valves used to control application or removal of pressure from the cylinder.

2 Stage Set Stop

Model BV89

The Model BV89 Brodie Two-Stage Valve is normally closed and designed for precise, accurate control and shut-off of petroleum products. The valve controls a predetermined amount of product to guarantee smooth, positive shut-off. Operational functions may include low flow start-up when used with a time delay circuit or other system controls.

The Model BV89 – Two-Stage shut-off plus pressure control achieved by sensing and controlling valve outlet pressure.

Digital Control

Model BV88

The Model BV88 Digital Control Valve is designed to provide precise flow rate control and batch delivery of fluid products when used with an electronic batch control device. The valve is controlled by the electronic preset for low flow start up, high flow rate control, low flow shutdown, and final shut-off. This also provides for maximum flowmeter accuracy by maintaining a constant flow rate with varying line pressures. The Model BV88 features an external pilot control loop that consists of a normally-open solenoid pilot, a normally-closed solenoid pilot, strainer, and opening/closing speed controls.

Principle of Operation The valve is pilot operated on a balanced piston principle. It is spring biased to a closed position. Pressure differential overcomes the force of the spring, causing the main valve to open and establish flow. The pilot control(s) vary the pressure on the spring side of the piston for position.

Two Stage Hydraulic

Model BV86

The Model BV86 Brodie Two-Stage Control Valve is a two-stage hydraulically actuated control valve designed to utilize the flow stream as the source of power. It is commonly used with a positive displacement flowmeter with a mechanical preset counter to provide shock-free two-stage closure. Through the use of optional accessory pilots, mounted in series with the BV86 pilot, functions such as back pressure, pressure reducing, or rate of flow control can be obtained.

Principle of Operation The Model BV86 valve is pilot operated on a balanced piston principle, spring biased to a closed position. Pressure differential overcomes the force of the spring, causing the main valve to open and establish flow. The pilot control(s) vary the pressure on the spring side of the piston for a position. The Hydraulic pilot is mechanically attached to and actuated by the preset counter of the flowmeter, and is hydraulically connected to the shut-off valve.

Two Stage Differential Control

Model BV87ALP

The Model BV87ALP Brodie Two-Stage Valve is typically used when handling products exhibiting high vapor pressure found in applications such as LPG or ammonia services.
The BV87ALP is a two-stage control valve designed for differential pressure control, pressure control, maximum rate of flow, and excess flow shut-down.

The BV87ALP consists of:
• Basic BV Model Valve
• Two Series BV10 Normally Closed Pilots
• One Series BV11 Normally Open Pilot
• One Series BV70 Differential Pressure Pilot
• One Series BV60 Excess Flow Shut-Down Pilot
• One Series BV54 Maximum Fate of Flow Pilot
• One 3-Way Ball Valve/Excess Flow Shut-Down
• Strainer
• Microswitch
• Pneutrol Controller (Opening Speed)
• Needle Valve (Closing Speed)

Differential Control

Model BV70

The Model BV70 Brodie Differential Control Valves are normally closed valves designed to maintain a controlled pressure differential within +/-2%. The pilot is balanced, single seated with large ports and will operate on a differential as low as 5 PSI (34.5 kPa).

Principle of Operation
The Valve is pilot operated and operates on a balanced piston principle, spring biased to a closed position. Pressure differential overcomes the force of the spring, causing the main valve to open and establish flow. The pilot control varies the pressure on the spring side of the piston for position.

Flow Limiting

Model BV54

The Model BV54 Brodie Flow Limiting Valve is normally opened and designed to maintain a controlled flow rate within +/-2%. The pilot is balanced, single seated valve with large ports and will operate on a differential as low as 5 psi (34.5 kPa).

Principle of Operation The Model BV54 valve is pilot operated and operates on a balanced piston principle, spring biased to a closed position. Pressure differential overcomes the force of the spring, causing the main valve to open and establish flow. The Rate of Flow (Flow Limiting) Valve is normally open and throttles toward a closed position on increasing differential pressure.

Back Pressure / Pressure Relief

Model BV60

The Model BV60 Brodie Control Valves are back pressure regulators designed to maintain a specific minimum upstream pressure regardless of fluctuations in flow rate or downstream pressure. When correctly installed and adjusted, the Model BV60 valve will maintain up stream pressure at a value within +/-2 PSI (13.8 kPa) of the valve pilot’s setting. A minimum pressure differential across the valve of 15 PSI (103 kPa ) is required for it to fully open.

Principle of Operation
The Model BV60 valve is controlled by a back pressure pilot which senses line pressure at a selected point upstream of the valve and throttles the valve to maintain a desired minimum pressure at that point. If line pressure at the sense point exceeds the setting of the pilot, the pilot throttles the valve open until the correct pressure level is reached. Conversely, if line pressure at the sense point falls below the setting of the pilot, the pilot throttles the valve closed until the correct pressure level is reached.

On/Off Solenoid Operated

Models BV10 & BV11

Model BV10, normally closed, and BV11, normally open, solenoid operated Brodie Control Valves are designed for remote on-off flow control. They are externally piped with a needle valve (speed of response control) and strainer as standard equipment.

Principle of Operation
The valves are pilot operated and operate on a balanced piston principle, spring biased to a closed position. Pressure differential overcomes the force of the spring, causing the main valve to open and establish flow. The pilot varies the pressure on the spring side of the piston for position.

Pressure Reducing

Model BV50

The Model BV50 Brodie Control Valve is a pressure reducing valve designed to regulate a downstream pressure regardless of fluctuations in flow rate or downstream pressure. When correctly installed and adjusted, the Model BV50 valve will regulate downstream pressure at a value within +/-2 PSI (13.8 kPa) of the valve pilot’s setting.

Principle of Operation
The Model BV50 valve is controlled by a pressure reducing pilot which senses line pressure at a selected point and throttles the valve to maintain a desired pressure at that point. If line pressure at the sense point exceeds the setting of the pilot, the pilot throttles the valve until the correct pressure level is reached. Conversely, if line pressure at the sense point falls below the setting of the pilot, the pilot throttles the valve again until the correct pressure level is reached.