-- [VALVES]

CREATE TYPE VALVES_TYPE AS ENUM ('PRV', 'PSV', 'PBV', 'FCV', 'TCV', 'GPV');

CREATE TABLE VALVES
(
  ID VARCHAR(32) PRIMARY KEY REFERENCES _LINK(ID)
, Node1 VARCHAR(32) REFERENCES _NODE(ID) NOT NULL
, Node2 VARCHAR(32) REFERENCES _NODE(ID) NOT NULL
, Diameter NUMERIC NOT NULL
, Type VALVES_TYPE NOT NULL
, Setting NUMERIC NOT NULL
, Minor_Loss NUMERIC NOT NULL
);