Emerson Fisher 377 Manuale utente

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Fisher™377 Trip Valve

Contents

Introduction 1.................................

Scope of Manual 1.............................

Description 1.................................

Specifications 2...............................

Educational Services 2.........................

Installation 4..................................

Supply Pressure Requirements 6.................

Operating Information 8.........................

Calibration 8.................................

Principle of Operation 9.........................

377D Trip Valve 9.............................

377L Trip Valve 10.............................

377U Trip Valve 11............................

Maintenance 12................................

Periodic Operational Check 13...................

Trip Valve Part Replacement Procedures 13........

Replacing Diaphragms and Valve Plug Parts 13.....

Replacing Stem/Plug Assembly Parts 14...........

Parts Ordering 15...............................

Parts Kits 15...................................

Parts List 15...................................

Figure 1. Fisher 377 Trip Valve Mounted on Size 130

585C Actuator

W8435‐1

Introduction

Scope of Manual

This instruction manual provides installation, operation, maintenance, and parts information for the Fisher 377 trip

valve. Refer to separate instruction manuals for information regarding the control valve, actuator, and accessories.

Do not install, operate, or maintain a 377 trip valve without being fully trained and qualified in valve, actuator and

accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to

carefully read, understand, and follow all of the contents of this manual, including all safety cautions and warnings. If

you have any questions regarding these instructions contact your Emerson sales office or Local Business Partner before

proceeding.

Description

377 pressure‐sensing trip valves, shown in figures 1, 2, and 3, are for control applications where a specific

valve/actuator action is required when supply pressure falls below a specific point. When supply pressure falls below

the trip point, the trip valve cause the actuator to fail up, lock in the last position, or fail down. When the supply

pressure rises above the trip point, the 377 trip valve automatically resets, allowing the system to return to normal

operation. The trip valve can be top‐mounted on a manifold, yoke‐mounted, or bracket‐mounted to match the

application requirements. 377 trip valves are used with all types of piston actuators.

Instruction Manual

D200319X012

377 Trip Valve

June 2017

Instruction Manual

D200319X012

377 Trip Valve

June 2017

Figure 2. Typical Fisher 377 Trip Valve

W4292-1

Figure 3. Simplified Sectional View of Trip Valve

UPPER

DIAPHRAGM

EXHAUST

PORT

RESTRICTION

PORT A

PORT B

PORT D

PORT E

PLUG

ASSEMBLIES

PORT F PORT C

VALVE

PLUG SPRING

SUPPLY

CONNECTION

LOWER

DIAPHRAGM

W4303‐1

Specifications

Specifications for 377 trip valves are given in table 1.

Educational Services

For information on available courses for 377 trip valves, as well as a variety of other products, contact:

Emerson Automation Solutions

Educational Services - Registration

Phone: 1-641-754-3771 or 1-800-338-8158

E-mail: [email protected]

emerson.com/fishervalvetraining

Instruction Manual

D200319X012

377 Trip Valve

June 2017

Table 1. Specifications

Available Configurations

377 Trip Valve: Includes check valve, but no volume

tank: user configured for locking position. For field

use or replacement.

When supply pressure falls below the trip point,

377D Trip Valve: Fails actuator piston down. Includes

check valve and volume tank.

377L Trip Valve: Locks actuator piston in the last

position.

377U Trip Valve: Fails actuator piston up. Includes

check valve and volume tank.

377CW Trip Valve: Fails fully clockwise to close valve.

Requires check valve and volume tank. Trip valve

moves piston to either up/down position and requires

actuator configuration for actual clockwise

movement.

377CCW Trip Valve: Fails fully counterclockwise to

close valve. Requires check valve and volume tank.

Trip valve moves piston to either up/down position

and requires actuator configuration for actual

counterclockwise movement.

All 377 Trip Valves can be converted to any of the

above fail modes with minor hookup changes

Allowable Supply Pressure for Trip Valve(1)

Maximum: 10.3 bar (150 psig)

Minimum: 3.8 bar (55 psig)

Outlet Pressure

Normal Operation: Pressure from control device

Fail‐Up or Fail‐Down Mode: Maximum volume tank

pressure

Lock‐In‐Last‐Position: Respective cylinder pressure

Trip Point(2)

Adjustable from a minimum of 2.8 bar (40 psig) to a

maximum of 72 percent of supply pressure;

see figure 4

Reset: 12.5 to 33 percent above adjusted trip point

Flow Coefficients (Cv)(3)

Depends on flow path (shown in figure 3) as follows:

Port A to Port B and Port D to Port E: 0.5

Port B to Port C and Port E to Port F: 0.6

Pressure Connections

1/4 NPT internal

Temperature Capabilities(1)

Nitrile Diaphragms and O‐Rings: -40 to 82_C

(-40 to 180_F)

Fluorocarbon Diaphragms and O‐Rings: -18 to 104_C

(0 to 220_F)

Volume Tank Maximum Internal Working Pressure

(for 377D, 377U, 377CW and 377CCW trip valves)

Standard: 10.3 bar (150 psig) for non‐ASME approved

applications. See note on page 7.

ASME Approved Applications: Rated 10.3 bar (150

psig), maximum; 9.3 bar (135 psig), recommended.

See note on page 7.

Hazardous Area Classification

Complies with the requirements of ATEX Group II

Category 2 Gas and Dust

377 SST

Safety Instrumented System Classification

SIL 3 capable - certified by exida Consulting LLC

Mounting

Top‐Mounted: Manifold‐mounted between a Fisher

3570 positioner and 480 actuator (manifolds cannot

be supplied with Fisher 585C, 685, 1061, 1066, and

1069 piston actuators)

Side‐Mounted: Yoke‐mounted or bracket‐mounted

for use with a FIELDVUE™DVC6200, DVC6200f,

DVC6200p, DVC6000 or DVC6000f digital valve

controller

Approximate Weight

Trip Valve

Aluminum: 0.95 kg (2.1 pounds)

SST: 2.31 kg (5.1 pounds)

Mounting Manifold: 0.5 kg (1.2 pounds)

Volume Tank: Varies between 5.4 and 363 kg (12 and

800 pounds) depending on size

-continued-

Instruction Manual

D200319X012

377 Trip Valve

June 2017

Table 1. Specifications (continued)

Declaration of SEP

Fisher Controls International LLC declares this

product to be in compliance with Article 4 paragraph

3 of the PED Directive 2014/68/EU. It was designed

and manufactured in accordance with Sound

Engineering Practice (SEP) and cannot bear the CE

marking related to PED compliance.

However, the product may bear the CE marking to

indicate compliance with other applicable European

Community Directives.

1. The pressure/temperature limits in this document and any applicable standard or code limitation should not be exceeded.

2. If the trip point is not specified, the trip point is factory set at 72 percent of supply pressure or 2.8 bar (40 psig), whichever is higher.

3. Values represent nominal Cvmeasures for each port pair using a trip valve/actuator combination.

Figure 4. Maximum Trip Point Settings

10.3

45 67 8 910

110

100

7.6

1501401301201101009080706055

NOTES:

1 TRIP POINT MAY BE SET TO ANY VALUE BETWEEN 2.8 BAR (40 PSIG) AND THE MAXIMUM TRIP POINT LINE.

2 RESET OCCURS AT 12.5 TO 33 PERCENT ABOVE ADJUSTED TRIP POINT.

TRIP POINT, PSIG

TRIP POINT, BAR

SUPPLY PRESSURE, BAR

SUPPLY PRESSURE, PSIG

A2779‐2

MAXIMUM TRIP POINT

SETTING TO ENSURE

RESET

Installation

WARNING

Avoid personal injury from sudden release of process pressure. Before mounting the controller:

D Always wear protective clothing, gloves, and eyewear when performing any installation operations to avoid personal

injury.

D Overpressuring any system component could result in personal injury or property damage due to fire and explosion

caused by venting or leakage of the supply medium. To avoid such injury or damage, provide suitable pressure‐relief or

pressure‐limiting devices if the supply pressure is capable of exceeding the maximum allowable pressure of the system

component.

D Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

D If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this

instruction manual.

Instruction Manual

D200319X012

377 Trip Valve

June 2017

CAUTION

Do not use sealing tape on pneumatic connections. This instrument contains small passages that may become obstructed

by detached sealing tape. Thread sealant paste should be used to seal and lubricate pneumatic threaded connections.

The 377 trip valve is normally ordered as part of a control valve assembly. Follow the procedure in the appropriate

valve body and actuator instruction manual when installing the control valve in the piping.

If the 377 trip valve is shipped separately from the control valve assembly, the installation procedure depends upon

the type of actuator and accessory equipment required for the individual control valve system. Install any accessory

equipment in the control valve system so that the overall functioning of the specified trip valve pressure line

connections is not disrupted. Figures 7, 8, and 9 are schematics showing the pressure line connections for each of the

three possible fail‐mode configurations of the trip valve.

CAUTION

377 trip valves are leak tested to ensure that the intended actuator fail mode is maintained upon loss of supply pressure.

Control system accessories, such as volume boosters with hard seats, compromise the integrity of the entire system due to

leakage. Therefore, using control system accessories, such as volume boosters, between the trip valve and the actuator is

not recommended. If this cannot be avoided and a volume booster is required, a volume booster designed for tight shutoff,

such as the Fisher 2625, provides a higher probability of control system integrity. Refer to figures 5 and 6 for proper

installation of 377 trip valves with 2625 volume boosters.

Figure 5. Fisher 2625 Volume Booster used with 377U or 377D Trip Valve

2625

1/2 O.D. TUBING

PISTON

ACTUATOR

POSITIONER

3/4 NPT

CHECK VALVE

3/4 NPT OR

1/2 NPT PIPING SUPPLY

377U

3/8 O.D.

TUBING

TYPICAL

NOTES:

1 THE HOOK UP OF PORT C AND F ARE REVERSED FOR 377D.

2. 3/4 NPT CHECK VALVE, 1/2 OR 3/4 NPT PIPING, AND 1/2‐INCH (OUTSIDE DIAMETER) COIL TUBING FOR THE VOLUME TANK ARE REQUIRED.

3. THE SUPPLY PRESSURE REGULATOR SPECIFIED MUST HAVE ADEQUATE CAPACITY FOR 2625 BOOSTERS. ALSO, IF THE 2625 BOOSTER IS TO BE NIPPLE MOUNTED, THE BOOSTER MUST BE

MOUNTED TO A 1/2 NPT OR LARGER CYLINDER CONNECTION. SOME SMALLER CYLINDERS CANNOT BE TAPPED THIS LARGE; CONTACT YOUR EMERSON SALES OFFICE FOR AVAILABILITY ON

SPECIFIC TYPES AND SIZES.

3/4 NPT OR

1/2 NPT PIPING

E1570

1/2 O.D. COIL VOLUME

TANK TUBING

VOLUME

TANK

VENT

FISHER i2P-100/

67CFR

INPUT SIGNAL

Instruction Manual

D200319X012

377 Trip Valve

June 2017

Figure 6. Fisher 2625 Volume Booster used with 377L Trip Valve

2625

1/2 O.D. TUBING

PISTON

ACTUATOR

POSITIONER

3/4 NPT

CHECK VALVE

3/4 NPT OR

1/2 NPT PIPING SUPPLY

377L

i2P-100/67CFR

3/8 O.D.

TUBING

TYPICAL

NOTES:

1. 3/4 NPT CHECK VALVE AND 1/2 OR 3/4 NPT PIPING ARE REQUIRED.

2. THE SUPPLY PRESSURE REGULATOR SPECIFIED MUST HAVE ADEQUATE CAPACITY FOR 2625 BOOSTERS. ALSO, IF THE 2625 BOOSTER IS TO BE NIPPLE MOUNTED, THE BOOSTER MUST

BE MOUNTED TO A 1/2 NPT OR LARGER CYLINDER CONNECTION. SOME SMALLER CYLINDERS CANNOT BE TAPPED THIS LARGE; CONTACT YOUR EMERSON SALES OFFICE FOR AVAILABILITY

ON SPECIFIC TYPES AND SIZES.

3/4 NPT OR

1/2 NPT PIPING

E1571

INPUT SIGNAL

Supply Pressure Requirements

WARNING

Severe personal injury or property damage may occur if the instrument air supply is not clean, dry, and oil free. While use

and regular maintenance of of a filter that removes particles larger than 40 micrometers in diameter will suffice in most

applications, check with an Emerson Automation Solutions field office and instrument industry air quality standards for use

with corrosive gas or if you are unsure about the proper amount or method of air filtration or filter maintenance.

CAUTION

Do not use sealing tape on pneumatic connections. This instrument contains small passages that may become obstructed

by detached sealing tape. Thread sealant paste should be used to seal and lubricate pneumatic threaded connections.

Instruction Manual

D200319X012

377 Trip Valve

June 2017

A supply regulator, if used, must have a flow capacity greater than the required combined capacity of the trip valve and

actuator. In order to ensure proper selection of a supply regulator, be sure the Cvvalue of the regulator is greater than

the appropriate flow path Cvvalue listed in table 1 for the trip valve. A regulator with insufficient capacity may allow

supply pressure to droop, which can cause the trip valve to trip again and begin a trip‐reset cycle. An example of an

appropriate supply regulator to use with a 377 trip valve is a 64 regulator; its capacity is usually great enough to meet

the demands of most trip valve/actuator combinations. Determine the requirements of your trip valve/actuator

combination for proper selection of a supply regulator.

Note

During normal operation, an adequately sized supply regulator maintains a greater supply pressure than the pressure demand of

the trip valve and control devices. However, if the normal actuator piston position is not relatively close to the actuator piston fail

position during startup, or during the restoration of supply pressure, the regulator supply pressure may droop and cause the trip

valve to trip again and begin a trip‐reset cycle. To prevent this, perform the following steps:

1. Adjust the instrument (control device) pressure to position the actuator piston as it is positioned in the fail mode.

2. Restore the supply pressure to the normal operating range.

3. Manually reset the instrument pressure for normal operation.

WARNING

If a flammable or hazardous gas is used as the supply pressure medium, personal injury or property damage could result

from fire or explosion of accumulated gas or from contact with hazardous gas. The positioner/ actuator assembly does not

form a gas‐tight seal, and when the assembly is enclosed, a remote vent line, adequate ventilation, and necessary safety

measures should be used. However, a remote vent pipe alone cannot be relied upon to remove all hazardous gas. Vent line

piping should comply with local and regional codes and should be as short as possible with adequate inside diameter and

few bends to reduce case pressure buildup.

Note

To ensure trip system integrity upon loss of supply pressure, a 377D or 377U trip system requires a volume tank and check valve as

shown in figures 7 and 9.

State and local regulations may require the use of ASME approved volume tanks. Determine requirements and applicable

regulations for proper volume tank selection.

For ASME approved applications, the volume tank is rated at 10.3 bar (150 psig) internal working pressure, and has a safety valve

with a 10.3 bar (150 psig) set pressure mounted on the volume tank for pressure relief. Avoid supply pressure too near the safety

valve set pressure. To ensure safety valve seat tightness and longevity, the recommended maximum supply pressure is 9.3 bar

(135 psig).

Standard volume tanks supplied in Europe must conform to Directive 2009/105/EC for simple pressure vessels. The maximum

pressure rating is stated on the tank.

For standard applications (not ASME approved), a DOT tank is used. This tank is rated at 14.5 bar (240 psig) in LP service. When

used with air, the rating should be considered to be 10.3 bar (150 psig), consistent with the maximum pressure allowed for the

377 trip valve.

1. Before installing the trip valve, inspect it to be sure it is free of any foreign material.

2. Be sure all connecting tubing is free of foreign material.

3. Use acceptable piping practices when installing the trip valve. Coat all external threaded connections with a pipe

compound.

Instruction Manual

D200319X012

377 Trip Valve

June 2017

CAUTION

To avoid damage and possible operational impairment to the trip valve, be careful not to get excessive pipe compound on

the connections. Excess compound could result in improper pilot and cylinder valve operation.

CAUTION

To ensure the integrity of control systems utilizing a 2625 volume booster in conjunction with a 377 trip valve, apply supply

pressure to the volume booster and to the volume tank (volume tank not required on 377L trip valve) through a check

valve. Failure to install the check valve properly will allow the cylinder pressure to bleed back through the open volume

booster supply port upon loss of supply pressure. The actuator may not fail as intended.

WARNING

Personal injury or property damage could result from bursting of parts due to temperature fluctuations or extreme heat. If

temperature fluctuations or extreme heat cannot be avoided, use a relief valve to protect the volume tank.

4. Read the following information before making pressure connections:

a. Trip valve port A must receive the operating pressure that is intended for the top of the actuator cylinder.

Depending on the actuator type and accessories being used, this operating pressure will be from a valve

positioner or switching solenoid.

b. Trip valve port B must provide operating pressure to the top of the actuator cylinder. Depending on the actuator

type and accessories being used, connect this port to the manifold assembly, to the top of the cylinder, or to the

cylinder connection on the hydraulic snubber (if one is used).

c. Trip valve port C must provide a fail‐mode outlet for the operating pressure to or from the top of the actuator

cylinder. For the fail‐down mode, connect this port to the volume tank. For the fail‐up mode, vent this port to

atmosphere. For the lock‐in‐last‐position mode, plug this port.

d. Trip valve port D must receive the operating pressure that is intended for the bottom of the actuator cylinder.

Depending on the actuator type and accessories being used, this operating pressure will be from a valve

positioner or switching solenoid.

e. Trip valve port E must provide operating pressure to the bottom of the actuator cylinder. Always connect this

port to the bottom of the actuator cylinder.

f. Trip valve port F must provide a fail‐mode outlet for the operating pressure to or from the bottom of the actuator

cylinder. For the fail‐down mode, vent this port to atmosphere. For the fail‐up mode, connect this port to the

volume tank. For the lock‐in‐last‐position mode, plug this port.

Operating Information

Calibration

This calibration procedure assumes that the trip valve is mounted on the actuator (or other device) and that all piping

and the appropriate volume tank (if necessary ) are installed. All key numbers refer to figure 10. For the appropriate

fail‐mode schematic, see figure 7, 8, or 9.

Instruction Manual

D200319X012

377 Trip Valve

June 2017

WARNING

The following procedure requires taking the trip valve out of service. To avoid personal injury and property damage by an

uncontrolled process medium, provide some temporary means of control of the process medium while the trip valve is out

of service.

1. Remove the adjusting screw cap (key 1).

2. Loosen the hex nut (key 3), and turn the set screw (key 2) counterclockwise until all loading is removed from the

spring (key 6).

3. Connect an adequately sized gauge for the supply pressure reading to the supply line. To make the fail action more

visible, adjust the control device signal so that actuator stem movement is visible when the trip valve is actuated.

4. For the lock‐in‐last‐position mode, remove the plugs from ports C and F.

5. Set the supply pressure at the required trip point pressure (refer to table 1 for the trip point limits).

Note

For proper calibration, completely back out the set screw (key 2) until there is no spring compression. Then, set the trip point by

turning the set screw clockwise to compress the spring.

6. Slowly turn the set screw clockwise to compress the spring until the trip valve trips. When the trip valve trips in the

fail‐up or fail‐down mode, the actuator stem moves to the appropriate position. In the lock‐in‐last‐position mode,

the actuator stem does not move, however, air will be heard escaping from ports C and F. This is because pressure is

being released from both sides of the actuator cylinder.

7. Tighten the hex nut (key 3), and install the adjusting screw cap (key 1).

8. For the lock‐in‐last‐position mode, reinstall the plugs in ports C and F.

9. Reset the control device for normal operation.

Principle of Operation

377D Trip Valve

Figure 7 illustrates trip valve operation in the fail‐down mode.

In normal operation, supply pressure loads the upper diaphragm of the trip valve. The valve plug spring keeps the

exhaust port closed. Supply pressure also loads the lower diaphragm through the restriction, causing the plug

assemblies to move down and isolate ports C and F while connecting port A to B and port D to E. Normal actuator

control pressure from the control device is applied to the top of the cylinder through ports A and B and to the bottom

of the cylinder through ports D and E. A volume tank is charged to the maximum supply pressure through a check

valve. The check valve maintains maximum supply pressure in the volume tank if the supply pressure drops.

When the supply pressure falls below the trip point, the exhaust port opens venting the supply pressure that is loading

the lower diaphragm. This causes the upper ports of the plug assemblies to close and disconnect normal pressure from

the control device to the actuator.

Volume tank pressure is then applied through ports C and B to the top of the actuator cylinder, while pressure in the

bottom of the actuator cylinder is vented through ports E and F. The pressure imbalance created forces the actuator

piston down.

Instruction Manual

D200319X012

377 Trip Valve

June 2017

When supply pressure is restored, it again loads the upper and lower diaphragms causing the trip valve to reset. The

exhaust port closes, the upper ports of the plug assemblies open, and the lower ports close. Normal actuator control

pressure from the control device is restored through ports A and B and ports D and E. The check valve opens and

recharges the volume tank to the maximum supply pressure.

GE08412‐A

A6905‐1

Figure 7. Fisher 377D Trip Valve Shown in Tripped Condition

SPRING

VALVE PLUG

UPPER

DIAPHRAGM

EXHAUST

PORT

SUPPLY

PRESSURE

LOWER

DIAPHRAGM

PORT D

PORT E

LOWER

PORTS

PORT F PORT C

PLUG

ASSEMBLIES

UPPER PORTS

PORT B

PORT A

VENT

MAIN SPRING

ACTUATOR

CONTROL

DEVICE

CHECK

VALVE

VOLUME

TANK

SUPPLY PRESSURE

CONTROL PRESSURE TO TOP OF CYLINDER (BLOCKED)

CONTROL PRESSURE TO TOP BOTTOM OF CYLINDER (BLOCKED)

PRESSURE TO TOP OF CYLINDER (FROM VOLUME TANK)

PRESSURE FROM BOTTOM OF CYLINDER (VENTING)

LOWER DIAPHRAGM LOADING PRESSURE (BEING VENTED)

DVC6200

377L Trip Valve

Figure 8 illustrates trip valve operation in the lock‐in‐last‐position mode.

When supply pressure falls below the trip point, the exhaust port opens venting supply pressure from the lower

diaphragm. This causes the upper ports of the plug assemblies to close and the lower ports to open. Because ports C

and F are plugged, no pressure change occurs on either side of the actuator piston and the piston is pressure‐locked in

position. No volume tank is necessary in this mode.

When supply pressure is restored, the plug assemblies move back into the normal operating position. Supply pressure

from the control device is applied to the actuator through ports A and B and ports D and E.

Indice

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