Yarway Steel Water Gauge Isolation Valve Sets

Description

Forged Steel Construction for Steam Service

Yarway water gauge valves use forged steel bodies that meet ASTM SA-105. Type 303 stainless steel stems support the operating mechanism. These materials suit the high-pressure and high-temperature steam duties listed for each series.

The steel construction also provides a consistent platform across several connection configurations. This model range allows users to select the required arrangement without changing the primary body material.

Lever and Chain-Wheel Operating Options

SG800 models use lever operation for steam service up to 1,500 psi at 600°F. The lever allows operators to move the valve between open and closed positions quickly.

L200 and SG700 models use chain wheels for service up to 3,000 psi at 700°F. Therefore, users can select an operating method and pressure range that matches the installation.

Outside Screw and Yoke Design

All three series use an outside screw and yoke design. The stem bushing sits outside the valve body, away from high temperatures and corrosive fluids.

SG800 valves use a quadruple stem thread for quarter-turn lever movement. L200 and SG700 valves use a single-pitch stem thread for chain-wheel operation. Each thread configuration supports the operating method of its respective series.

Model-Specific Connection Configurations

Yarway water gauge isolation valves offer model-specific vessel and gauge connections. SG800 options include 3/4-inch male pipe connections and standard flanged connections.

L200 and SG700 models provide additional female, socket-weld and ring-type joint configurations. Selected SG700 models include a 1/2-inch Class 2500 RTJ gauge connection.

Ball-check arrangements also vary by model. Available configurations include no ball checks, lower-valve checks, checks in both valves or optional checks. Some models also offer unions or equalizer tubes.

Grafoil Packing Cartridges

Grafoil packing cartridges serve the operating stem and nipple gauge connections. The cartridge replaces loose, individual packing washers and supports leak-resistant operation.

Identical two-bolt packing yokes secure the cartridge. SG800 models include the Grafoil packing cartridge as standard equipment. L200 and SG700 models also use cartridges secured by two-bolt packing yokes.

Adjustable 18-Position Gauge Lever

The SG800 gauge lever locks positively in 18 positions. Operators can adjust the lever angle when the valve is closed, regardless of stem orientation.

This adjustment lets operators select the required handle position. Meanwhile, the quadruple stem thread moves the valve between open and closed positions with one-quarter lever movement.

Replaceable Stainless Steel Valve Seats

SG800 models use a one-piece 420F stainless steel replaceable seat. SG700 Series models also use a one-piece 420F stainless steel seat.

The hardened seat provides precise fit and flow surfaces. Furthermore, its one-piece construction supports faster renewal, improved performance and longer service life.

Blowdown Connection Options

The lower valve includes a connection for system blowdown. SG800 models use a 1/2-inch female NPT/socket-weld connection.

L200 and SG700 models use a 1/2-inch female socket-weld connection. The selected drain arrangement should match the installation and piping requirements.

Live-Loading Upgrade for SG800 Valves

The RK-34 live-loading kit upgrades installed SG800 Series valves. It improves leak resistance and service life under vibration, pressure changes, time in service and wear.

The kit includes cap screws, flat washers, a graphite packing cartridge, spring washers and instructions. New SG800 valves can also include live loading through the model-number option.