CSA ANSI IAS NGV 4.6-1999 pdf download MANUALLY OPERATED VALVES FOR NATURAL GAS DISPENSING SYSTEMS
1.1 SCOPE
1.1.1 These requirements apply to manually operated valves for high pressure natural gas.
1.1.2 These requirements do not apply to cylinder shut-off valves.
1.1.3 A valve that complies with the requirements for a Class A valve may be used for a Class B valve application, however, a Class B valve may not be substituted for a Class A valve. (See Part IV Definitions.)
1.2 GENERAL
1.2.1 The construction of parts not covered by these requirements shall be in accordance with reasonable concepts of safety, substantiality and durability.
All specifications as to construction set forth herein may be satisfied by the construction actually prescribed or such other construction as will provide at least equivalent performance.
1.2.2 Valves shall be provided with means to compensate for manufacturing tolerance variations, displacement of lubricants, and for wear which may occur.
1.2.3 For Items Unique To One Country (Canada) see Exhibit A.
1.2.4 All references to psi throughout this document are to be considered gauge pressures unless otherwise specified.
1.2.5 All dimensions used in this standard are in metric units [International System of Units (SI)], unless otherwise specified. If a value for a measurement, as given in this standard, is followed by an equivalent value in other units, the fìrst stated is to be regarded as the specification.
1.3 ASSEMBLY Devices shall be (1) designed to minimize the possibility of incorrect assembly; (2) designed to be secure against displacement, distortion, warping or other damage; and (3) constructed to maintain a fixed relationship between essential parts to provide continued compliance with this standard when under normal and reasonable conditions of handling and usage.
1.3.2 Valve handles shall be provided and shall be securely attached to the rotor member of the valve. Handles shall be replaceable.
1.4 CONNECTIONS
1.4.1 The means for attaching the device shall be one of those listed below. All fittings shall comply with the applicable tests specified in this standard.
a. SAE straight thread O-ring boss capable of mating with hydraulic hose fittings in accordance with Hydraulic Hose Fittings, ANSI/SAE J516,
b. Straight thread O-ring boss with left hand threads marked appropriately,
c. Double ferrule grip type fitting connections,
d. Female straight thread O-ring boss port in accordance with the Specification for Straight Thread O-ring Boss Port, ANSI/SAE J1926 or Fluid Power Systems and Components – Metric Ports – Dimensions and Design, IS0 6149, or a male thread and seal designed to be installed in a port in accordance with ANSI/SAE J1926 or IS0 6149,