diaphragm-type actuator economy with · topsi-wt seal cartridge dual stem seals wear bearing...
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DIAPHRAGM-TYPE ACTUATOR ECONOMY WITHTRAD ITI 0 NAL QUALITY
The SAFOCO Diaphragm Actuator combinessimplicity with ease of maintenance to providean extraordinary value in a SSVactuator.
Its operating principle and rugged designmake this actuator inherently trouble-free. Thisdiaphragm actuator design has eliminated theproblems of downtime and added safetyfeatures vital to today's customer requirements.This actuator is designed for most surface safetyapplications.
The SAFOCO Actuator utilizes the traditionaldiaphragm concept by eliminating galling,misalignment and distortion during operation.
The close tolerance problem has beeneliminated by providing wear bearings in theactuator and bonnet to suspend the top shaftand bonnet stem from contacting metal duringoperation.
SAFOCO has designed into each model,series, and size of diaphragm actuator theindustry's strongest compression spring. This isimportant to ensure gate valve closure. Nospecial tools are required when loading thecompression spring.
Ease of repair and service has been providedby designing the top seal cartridge so that it canbe removed easily and quickly.
To remove the actuator from the bonnetremove 8 hex head bolts with a crescentwrench, then lift the actuator from the bonnet.
SAFOCOS' actuator philosophy emphasizessafety and reliability, compact and simpledesign, fast response t!me, easy maintenance,optional use of control pressure and quality inmanufacture and service.
API 14D SpecificationAPI 6A SpecificationCERTIFICATES OF AUTHORIZATION
API License No. J 40-0033 has beenreplaced by API License No. 6A-0335
The right to use the official API monogram onWellhead Equipment (as listed in Spec. 6A)under API Specification 6A for WellheadEquipment.
FAIL CLOSEDOPERATION
TOPSI-WT
SEAL CARTRIDGE
DUAl STEM SEALS
WEAR BEARING
DIAPHRAGM RETAINER NUT
FACE SEAL
DIAPHRAGM
. DIAPHRAGMRETAINERPLATE
TOP SHAFT WIPER RING"
DUAL SEALS '"""
"'"The SSV valve with a SAFaGa
Actuator is normally supplied in thefail-closed configuration. Pneumaticactuator supply pressure drives thevalves reverse ported gate down andholds it in the open position undernormal operating conditions. In theevent of an abnormal condition, theactuator supply pressure is released orbled off by quick exhaust mechanisms,allowing the valve to close by bodypressure acting on the bonnet stemdiameter and spring force. Restoringof Pneumatic Actuator supply pressureautomatically reopens the valve.
When required, the valve can beconfigured with a fail open gatedesign for a vent or blow-downsystem.
TOP DWHRAGM CASE '"
RELEIF DEVICEBURST DISC
PRESSUREINLET
UPPER SPRINGRETAINER
SPRING
DOWNSTOP
BREATHER
STEM SPACERS
LOWER -DIAPHRAGMCASE
ROD WIPER
WEAR-BEARINGo-RINGS
-- DOG POINT SCREWPOLY PAKS prevents bonnet
ring rotationLOWER HOUSING
BASE PLATE RING'
BOLTS
CLOSEDLOWER SPRING RETAINER
PACKING CARTRIDGE
BONNETSTEM POLY PAKS
..WEAR BEARING (TOP & BOTTOM)
As actuator pressure exhausts from thehousing or cylinder, valve body pressureand actuator spring force close the valve.
OPEN
SECONDARYMETAL TO METALSTEM SEAlcontrols stem leakagein case of packingloss by fire
ACCESSORIES
Heat sensitive lock open devices, manual handwheel operators,hydraulic operators, position indicators, remote control devices,actuator quick exhaust devices, stem protector, electromechanicalswitches.. electrical indicating devices.
Actuator input pressure drives the reverse-ported gate downward into open position.
ACTUATOR SIZES
10011400090 13000
80 12000
1100010 10000
60 9000
800050 1000
40 6000
500030 4000
20 3000
200010 1000
-' ,~~ IDS 120 135 150 PSI.. .. ,. 90 IDS 120 135 150
KPa 100 200 300 400 ~.:~ 600 100 KPa 100 200 300 400 500 600 100 800 900 1000. . ACTUATOR CONTROL PRESSURE /8 I. ACTUATOR CONTROL PRESSURE ACTUATOR CONTROL PRESSURE 8
To determine control pressure consult graphs for nominal valve size Find maximum expected flowline pressure (A) on left hand ordinate Find the actuator controi pressure (8) of a line drawn verticallyfrom 18). The intersection of the two lines indicates the correct size actuator for the specific application
SPECIFICATIONS CONTROL PRESSURE EQUATION
- --- -, -- . .-.* Typical dimensions. for exact dimensions per application contact waco customer service.
WARRANTY STATEMENT Products ililustrated in this booklet are subject to Terms and conditions of Sale induding Warranty and Umitations of Uability as shown in our Price Ust
1142 J -A Todd Road. Houston, Texas USA . 77055 . Office: J -713-956- J 595 . Fax: 1-713-956-2449
C COI'IIight 1993. waco Inc We reserve the right 10 change specllicaliOflS or information appearing in this bullelin without incurring any obligations for equipment prevlouso/ or subsequento/ sc;d