Pro football's player union marched up Capitol Hill yesterday, so to speak, and came down with an NFL Players Association Steering Committee on the Prevention of Domestic Violence.

A fistful of words, that, but 30 members strong and dedicated to the proposition as Rep. Barbara Mikulski (D-Md.), a Colt fan, stated it, "It's not manly to beat the hell out of your wife!"

Stan White, Colt linebacker; Doug France, Ram tackle, and Gene Upshaw, the Raider serving as players association president declared NFLPA four-square behind a congressional bill to stop wife- and child-battering and such violence within families, and will spread the word however it can.

"Although professional football players are thought of as tough and aggressive," said Upshaw, "we would like to see that competition left in the field" . . .

Fresh topics for conversation for Saturday's NFL Players Association banquet at the Washington Hilton: All-pro guard Joe Delamielleure announcing that eight years in Buffalo is enough, he wants to be traded because he doesn't enjoy (1) playing there and (2) playing under Chuck Knox . . . Roman Gabriel the new head coach at Cal Poly-Pomona. Gabe broke in with two seasons as volunteer assistant at the College of the Desert near Palm Springs, with his son Robin playing quarterback (and now moving up to U. of New Mexico) . . .

Basketball fans seeking NBA-on-CBS (delayed) must look elsewhere tonight than WDVM-TV-9. The station wants to keep its recently initiated Friday night 11:30 p.m.-1 a.m. "Eyewitness News After Hours" rolling. But beginning with Wednesday's action, Channel 9 promises, they'll pick up all the NBA feeds from the network, including the entire championship series . . .

Mike Vlahos, Mr. Home Plate Club for so long, had good reason for missing the Oriole luncheon at the TD Club yesterday: removal of a stomach tumor at George Washington U. hospital. Some cards would be nice, for now. Root for his speedy return to the ball diamonds . . .

The Capitals lose a good man in Pierce Gardner, their p.r. specialist as he leaves to collaborate on a film script -- "comedy, non-sports." He'll stay in Washington; we'll keep our eyes peeled for him in Style . . .

George Washington has landed 6-4 guard-forward Jon Turner of Bloomfield, Conn., on a basketball grant; he averaged 20.3 points, 16.1 rebounds the past season.

Whole lot of goings-on here this weekend: Saturday night, Digger Phelps, Irish basketball coach, addresses Universal Notre Dame Night dinner at the Bolling AFB Officers Club . . . Saturday 7:30 several Redskins do violence to the game of basketball, engaging Prince George's County police in a donkey tilt at Friendly H.S., Oxon Hill; proceeds to the Quinton Explorer Boy Scouts . . .